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Journal articles on the topic 'Digitale Geometrie'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Amal, Citra Amalia, Andi Annisa Amalia, and Sri Andayaningsih. "POTOMETRIUM (POT TANAMAN GEOMETRIS DAN TERARIUM) SERTA PEMASARAN DIGITAL BAGI KELOMPOK PENJUAL TANAMAN HIAS DI KELURAHAN MACCINI SOMBALA KOTA MAKASSAR." Panrita Abdi - Jurnal Pengabdian pada Masyarakat 4, no. 1 (February 11, 2020): 110. http://dx.doi.org/10.20956/pa.v4i1.7698.

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POTOMETRIUM (Geometric and Terraium Pot Plants) and Digital Marketing for The Ornamental Plant Traders Group in Maccini Sombala Village, Makassar CityAbstract. The world of architecture is currently colored by the development of farming methods for urbanites in limited land by arranging plants into special containers of high artistic value such as terrariums and pots in the style of industrial geometry. Some of the problems faced by ornamental plant sellers are the high competition in selling similar types of potted plants because the types of pots sold are generally the same as those on the market, not yet skilled in assembling cactus and succulent plants into terrarium containers, and the sales system is still conventional in nature. To overcome these problems, community service was carried out in the form of developing productive partners with the theme POTOMETRIUM (Geometry and Terrarium Plant Pots). POTMETRIUM PPM activities consist of preparatory activities, identification and classification of ornamental plant sales groups, dissemination of POTOMETRIUM product knowledge and socialization of PKM implementation activities, implementation of geometric pot making workshops, implementation of technical terrarium arranging workshops, implementation of digital marketing technical workshops, making video tutorials POTOMETRIUM, publications implementation of activities, preparation of activity reports, and implementation of monitoring and evaluation of the results of PKM activities.Keywords: Geometric, terrarium, product, digital, ornamental plant.Abstrak. Dunia arsitektur saat ini diwarnai perkembangan metode bercocok tanam bagi kaum urban di lahan terbatas dengan merangkai tanaman ke dalam wadah khusus yang bernilai seni tinggi diantaranya Terarium dan Pot bergaya industrial geometri. Beberapa permasalahan yang dihadapi oleh kelompok penjual tanaman hias yaitu tingginya persaingan penjualan jenis pot tanaman sejenis karena jenis pot yang dijual umumnya sama dengan yang ada di pasaran, belum terampil dalam merangkai tanaman kaktus dan sukulen ke dalam wadah terarium, dan sistem penjualan masih bersifat konvensional. Untuk mengatasi permasalahan tersebut, maka dilakukan pengabdian kepada masyarakat dalam bentuk pengembangan mitra produktif ber-tema POTOMETRIUM (Pot Tanaman Geometri dan Terarium). Kegiatan PPM POTOMETRIUM terdiri atas kegiatan persiapan, identifikasi dan klasifikasi kelompok penjual tanaman hias, sosialisasi pengetahuan produk POTOMETRIUM dan sosialisasi pelaksanaan kegiatan PKM, pelaksanaan workshop pembuatan pot geometris, pelaksanaan workshop teknis merangkai terarium, pelaksanaan workshop teknis pemasaran digital, pembuatan video tutorial POTOMETRIUM, publikasi pelaksanaan kegiatan, penyusunan laporan kegiatan, dan pelaksanaan monitoring serta evaluasi hasil kegiatan PKM.Kata Kunci: Geometris, terarium, produk, digital marketing, tanaman hias.
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Liu, Y., M. R. Johnson, E. A. Matida, S. Kherani, and J. Marsan. "Creation of a standardized geometry of the human nasal cavity." Journal of Applied Physiology 106, no. 3 (March 2009): 784–95. http://dx.doi.org/10.1152/japplphysiol.90376.2008.

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A novel, standardized geometry of the human nasal cavity was created by aligning and processing 30 sets of computed tomography (CT) scans of nasal airways of healthy subjects. Digital three-dimensional (3-D) geometries of the 60 single human nasal cavities (30 right and 30 mirrored left cavities) were generated from the CT scans and measurements of physical parameters of each single nasal cavity were performed. A methodology was developed to scale, orient, and align the nasal geometries, after which 2-D digital coronal cross-sectional slices were generated. With the use of an innovative image processing algorithm, median cross-sectional geometries were created to match median physical parameters while retaining the unique geometric features of the human nasal cavity. From these idealized 2-D images, an original 3-D standardized median human nasal cavity was created. This new standardized geometry was compared against the original geometries of all subjects as well as limited existing data from the literature. The new model has potential for use as a geometric standard in future experimental and numerical studies of deposition of inhaled aerosols, as well as for use as a reference during diagnosis of unhealthy patients. The specific procedure developed could also be applied to build standard nasal geometries for different identifiable groups within the larger population.
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Demian, Nicoleta. "Geometria ecoului – proiect de coregrafie digitală." Tehnologii informatice și de comunicație în domeniul muzical / Information and communication Technologies in Musical Field XI, no. 1 (November 1, 2020): 87–92. http://dx.doi.org/10.47809/ictmf.2020.01.09.

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Hidayat, Heri, Dela Delviana, Dinar Farida Fauziah, and Maudina Yuniar. "Pengembangan Kreatifitas Anak Usia Dini Melalui Bentuk Geometri di Era Digital." Aulad: Journal on Early Childhood 4, no. 1 (March 15, 2021): 16–21. http://dx.doi.org/10.31004/aulad.v4i1.85.

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Penelitian ini bertujuan untuk melihat perkembangan kreativitas anak usia dini melalui bentuk geometri di era digital, penulis menemukan bahwa perkembangan kreativitas tersebut dapat dilihat dari penggunaan media permainan seperti tangram atau kepingan geometri. Metode penelitian yang digunakan adalah kajian pustaka atau studi kepustakaan yaitu berisi teori teori yang relevan dengan masalah–masalah penelitian. Hasil penelitian ini didukung dengan penelitian yang dilakukan Putri Rahmi, dkk di TKN Pembina Lawe Alas, menyatakan bahwa bermain tangram dapat meningkatkan kreativitas anak dalam mengenal bentuk-bentuk geometri. Melalui 3 tahap pengujian, anak mengalami peningkatan disetiap tahapannya, sehingga secara keseluruhan terjadi perkembangan kreativitas anak mencapai 70% melalui permainan tangram. Selain itu penelitian yang dilakukan pada Kelompok B TK IT Permata Bunda Mranggen Demak, Kelompok B di TK Aba Jemawan IV Jatinom dan Kelompok Belajar Bina Insan Mandiri Kecamatan Cimalaka Kabupaten Sumedang yang menyatakan bahwa permainan tersebut memberi pengaruh yang positif pada anak. Sehingga pengalaman menggunakan Tangram membantu anak-anak mengembangkan sikap positif terhadap geometri, mengembangkan keterampilan identifikasi dan klasifikasi mereka, dan menumbuhkan pemahaman tentang konsep dan hubungan geometris dasar
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Yang, Su, Miaole Hou, Ahmed Shaker, and Songnian Li. "Modeling and Processing of Smart Point Clouds of Cultural Relics with Complex Geometries." ISPRS International Journal of Geo-Information 10, no. 9 (September 16, 2021): 617. http://dx.doi.org/10.3390/ijgi10090617.

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The digital documentation of cultural relics plays an important role in archiving, protection, and management. In the field of cultural heritage, three-dimensional (3D) point cloud data is effective at expressing complex geometric structures and geometric details on the surface of cultural relics, but lacks semantic information. To elaborate the geometric information of cultural relics and add meaningful semantic information, we propose a modeling and processing method of smart point clouds of cultural relics with complex geometries. An information modeling framework for complex geometric cultural relics was designed based on the concept of smart point clouds, in which 3D point cloud data are organized through the time dimension and different spatial scales indicating different geometric details. The proposed model allows smart point clouds or a subset to be linked with semantic information or related documents. As such, this novel information modeling framework can be used to describe rich semantic information and high-level details of geometry. The proposed information model not only expresses the complex geometric structure of the cultural relics and the geometric details on the surface, but also has rich semantic information, and can even be associated with documents. A case study of the Dazu Thousand-Hand Bodhisattva Statue, which is characterized by a variety of complex geometries, reveals that our proposed framework is capable of modeling and processing the statue with excellent applicability and expansibility. This work provides insights into the sustainable development of cultural heritage protection globally.
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Küchler, Susanne. "Differential Geometry, the Informational Surface and Oceanic Art: The Role of Pattern in Knowledge Economies." Theory, Culture & Society 34, no. 7-8 (October 10, 2017): 75–97. http://dx.doi.org/10.1177/0263276417730600.

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Graphic pattern (e.g. geometric design) and number-based code (e.g. digital sequencing) can store and transmit complex information more efficiently than referential modes of representation. The analysis of the two genres and their relation to one another has not advanced significantly beyond a general classification based on motion-centred geometries of symmetry. This article examines an intriguing example of patchwork coverlets from the maritime societies of Oceania, where information referencing a complex genealogical system is lodged in geometric designs. By drawing attention to the interplay of graphic pattern and number-based code and its role in the knowledge economies of maritime societies, the article offers new insight into possible ways of designing a digital informational surface that captures the behaviour of an operational system, allowing both for differentiation and integration.
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Li, Chang He, Zan Fang, Yi Cui, and Y. C. Ding. "Layered Manufacturing by Reverse Engineering-Principle and Application." Advanced Materials Research 102-104 (March 2010): 436–40. http://dx.doi.org/10.4028/www.scientific.net/amr.102-104.436.

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Additive processes can be defined as layered manufacturing, based on the dispersed/accumulated principle, Layered manufacturing is directly transforming 3D CAD models to real objects, the reverse engineering of mechanism can be applied to layered manufacturing for production complex geometries for long-term consistency, and the analysis demonstrates the application of the reverse engineering fulfills the segments of design, production, inspection, test. The most notable advantage is the combination of digital technology and geometric model rebuilding technology.
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DAL POZ, ALUIR PORFIRIO, and MAURICIO GALO. "A Utilização do Conceito de Geometria Epipolar em Correlação de Imagens Digitais." Pesquisas em Geociências 19, no. 2 (December 31, 1992): 137. http://dx.doi.org/10.22456/1807-9806.21304.

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O advento da fotogrametria digital trouxe para o fotogrametrista novos desafios, dentre os quais comparece o problema de identificar e medir pontos-homólogos sobre um estereopar de imagens digitais fazendo o uso de um método de correlação digital. Esta técnica pode ser vantajosamente implementada segundo as Linhas Epipolares Homólogas (LEH). O objetivo desse artigo é fazer a abordagem do método de correlação digital segundo as LEH, mais comumente denominado correlação epipolar, bem como apresentar os princípios para a determinação destas LEH. O procedimento para a determinação das Linhas Epipolares Homólogas apresentado foi implementado em computador e alguns testes com imagens artificiais e reais foram realizados.
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Risdianti, Devi, Murad, and Guyup Mahardhian Dwi Putra. "Kajian Pengeringan Jahe (Zingiber Officinale Rosc) berdasarkan Perubahan Geometrik dan Warna menggunakan Metode Image Analysis (Study of Dried Ginger (Zingiber Officinale Rosc) based on Changes in Geometric and Color using Image Analysis)." Jurnal Ilmiah Rekayasa Pertanian dan Biosistem 4, no. 2 (September 30, 2016): 275–84. http://dx.doi.org/10.29303/jrpb.v4i2.35.

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Purpose of this study was to determine change in geometric and color during the drying process using image analysis method. Method used in this study was experimental method. Tools and materials used were ginger, image acquisition box, digital cameras, and computers. Measured parameters included temperature, moisture content, mass of material, geometry and color changes. Results from this study showed that the lowest value of material mass was 1.91 gr of the lowest shelf and 3.21 gr of the upper shelf which directly proportional to the reduction of material moisture content at lowest shelf by 5.66%, due to the heating source placed near the shelf, therefore it will directly heat the material. While the highest value was showed by the highest shelf material of 13.93% moisture content. Actual measurement of surface shrinkage showed declining during 8-hour drying and result from image analysis ranged from 37,548 to 17,201 pixels, 27.77 cm2 to 10.07 cm2by using trapezoidal numerical integration of the highest shelf, and 27.3 cm2 to 10.37 cm2 by using Simpson methods. Based on this study, image analysis can be used to measure ginger color changes from yellowish white to brownish yellow and measure surfaces shrinkage. Keywords: geometric and color, ginger, drying ABSTRAK Tujuan dari penelitian ini adalah untuk mengetahui perubahan geometrik dan warna menggunakan metode image analysisselama proses pengeringan. Metode yang digunakan dalam penelitian adalah metode eksperimental. Alat dan bahan yang digunakan, yaitu jahe, box pengambilan citra, kamera digital, komputer. Parameter yang diukur antara lain suhu, kadar air, massa bahan, perubahan geometri dan warna. Dari hasil penelitian dengan pengukuran massa bahan rak bawah memiliki nilai terendah yaitu 1,91 gram dan rak atas 3,21 gram berbanding lurus dengan penurunan kadar air rak bawah 5,66%, dikarenakan dekatnya sumber pemanas dengan rak sehingga langsung mengenai bahan dan yang paling tinggi yaitu rak atas 13,93%. Pengukuran penyusutan permukaan menunjukkan penurunan selama 8 jam pengeringan secara aktual dan menggunakan image analysis berkisar dari 37548 sampai 17201 piksel menggunakan metode image analysis, 27,77 cm2 sampai 10,07 cm2 pada rak atas dengan integrasi numerik trapezoidal dan 27,3 cm2 sampai 10,37 cm2 rak atas mengggunakan metode simpson. Berdasarkan penelitian tersebut image analysis ini dapat digunakan untuk mengukur warna jahe yang menghasilkan dari putih kekuningan menjadi kuning kecoklatan dan pengukuran penyusutan permukaan. Kata kunci: geometrik dan warna, jahe, pengeringan
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10

Jackin, Boaz Jessie, C. S. Narayanamurthy, and Toyohiko Yatagai. "Geometric phase shifting digital holography." Optics Letters 41, no. 11 (June 1, 2016): 2648. http://dx.doi.org/10.1364/ol.41.002648.

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Majid, Shahn, and Anna Pachoł. "Digital finite quantum Riemannian geometries." Journal of Physics A: Mathematical and Theoretical 53, no. 11 (February 27, 2020): 115202. http://dx.doi.org/10.1088/1751-8121/ab1cf2.

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12

Nakamura, Akira, and Kunio Aizawa. "Digital images of geometric pictures." Computer Vision, Graphics, and Image Processing 30, no. 1 (April 1985): 107–20. http://dx.doi.org/10.1016/0734-189x(85)90021-0.

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Nakamura, Akira, and Kunio Aizawa. "Digital images of geometric pictures." Computer Vision, Graphics, and Image Processing 30, no. 1 (April 1985): 123. http://dx.doi.org/10.1016/0734-189x(85)90027-1.

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14

Satonaka, Naoki, Akifumi Yoshida, Nobuhiro Sugimura, Yoshitaka Tanimizu, and Koji Iwamura. "Mathematical Analysis of Three-dimensional Geometric Tolerances of Mechanical Products : Analysis under Maximum Material Condition(Digital design and digital manufacturing (continued))." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2005.2 (2005): 313–18. http://dx.doi.org/10.1299/jsmelem.2005.2.313.

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Polimeni, Beniamino. "PRODUCING DESIGN OBJECTS FROM REGULAR POLYHEDRA: A PRACTICAL APPROACH." Boletim da Aproged, no. 34 (December 2018): 49–55. http://dx.doi.org/10.24840/2184-4933_2018-0034_0007.

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In the last few years, digital modelling techniques have played a major role in architecture and design, influencing, at the same time, the creative process and the fabrication of objects. This revolution has produced a new productive generation of architects and designers focused on the expanding possibilities of material and formal production, reinforcing the idea of architecture as an interaction between art and artisanship. This original perspective inspires this paper, which illustrates the contemporary scenario and provides some practical guidance about tools and technologies the designers most often use for creating geometric sculptures with 3D printing. Creative possibilities of topological mesh modelling are used to generate complex geometries from regular polyhedra. This process explores how combining different geometric operations can activate architectural inquiry and generate fascinating shapes with creative flexibility.
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NEDOMOVÁ, Š., and J. BUCHAR. "Goose eggshell geometry." Research in Agricultural Engineering 60, No. 3 (September 12, 2014): 100–106. http://dx.doi.org/10.17221/80/2012-rae.

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The paper presents a new approach of the eggshell geometry determination using and analysing the egg digital image and edge detection techniques. The detected points on the eggshell contour were fitted by the Fourier series. The obtained equations describing an egg profile were used to calculate the egg volume, surface area, and radius of curvature with much higher degree of precision in comparison with previously published approaches. The paper shows and quantifies the limitations of the common and frequent procedures.
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Boyd, Stephen P., Seung-Jean Kim, Dinesh D. Patil, and Mark A. Horowitz. "Digital Circuit Optimization via Geometric Programming." Operations Research 53, no. 6 (December 2005): 899–932. http://dx.doi.org/10.1287/opre.1050.0254.

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Ping Dong, J. G. Brankov, N. P. Galatsanos, Yongyi Yang, and F. Davoine. "Digital watermarking robust to geometric distortions." IEEE Transactions on Image Processing 14, no. 12 (December 2005): 2140–50. http://dx.doi.org/10.1109/tip.2005.857263.

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Majid, Shahn, and Anna Pachoł. "Classification of digital affine noncommutative geometries." Journal of Mathematical Physics 59, no. 3 (March 2018): 033505. http://dx.doi.org/10.1063/1.5025815.

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Karasaka, Lütfiye, Hakan Karabörk, Ahmet Güntel, and Fatih Esirtgen. "Geometric Analysis of Digital Aerial Images." International Journal of Environment and Geoinformatics 4, no. 1 (March 1, 2017): 36–42. http://dx.doi.org/10.30897/ijegeo.306491.

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Rigetti, Chad, R�my Mosseri, and Michel Devoret. "Geometric Approach to Digital Quantum Information." Quantum Information Processing 3, no. 6 (December 2004): 351–80. http://dx.doi.org/10.1007/s11128-004-7875-2.

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Sundby, Tiril, Julia Maria Graham, Adil Rasheed, Mandar Tabib, and Omer San. "Geometric Change Detection in Digital Twins." Digital 1, no. 2 (April 15, 2021): 111–29. http://dx.doi.org/10.3390/digital1020009.

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Digital twins are meant to bridge the gap between real-world physical systems and virtual representations. Both stand-alone and descriptive digital twins incorporate 3D geometric models, which are the physical representations of objects in the digital replica. Digital twin applications are required to rapidly update internal parameters with the evolution of their physical counterpart. Due to an essential need for having high-quality geometric models for accurate physical representations, the storage and bandwidth requirements for storing 3D model information can quickly exceed the available storage and bandwidth capacity. In this work, we demonstrate a novel approach to geometric change detection in a digital twin context. We address the issue through a combined solution of dynamic mode decomposition (DMD) for motion detection, YOLOv5 for object detection, and 3D machine learning for pose estimation. DMD is applied for background subtraction, enabling detection of moving foreground objects in real-time. The video frames containing detected motion are extracted and used as input to the change detection network. The object detection algorithm YOLOv5 is applied to extract the bounding boxes of detected objects in the video frames. Furthermore, we estimate the rotational pose of each object in a 3D pose estimation network. A series of convolutional neural networks (CNNs) conducts feature extraction from images and 3D model shapes. Then, the network outputs the camera orientation’s estimated Euler angles concerning the object in the input image. By only storing data associated with a detected change in pose, we minimize necessary storage and bandwidth requirements while still recreating the 3D scene on demand. Our assessment of the new geometric detection framework shows that the proposed methodology could represent a viable tool in emerging digital twin applications.
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Pires, Janice De Freitas, Alice Theresinha Cybis Pereira, and Alexandre Gonçalves. "TAXONOMIAS DE GEOMETRIA DA ARQUITETURA CONTEMPORÂNEA: UMA ABORDAGEM DIDÁTICA AO ENSINO DA MODELAGEM PARAMÉTRICA NA ARQUITETURA." Gestão & Tecnologia de Projetos 12, no. 3 (November 22, 2017): 27. http://dx.doi.org/10.11606/gtp.v12i3.133954.

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Este trabalho tem uma abordagem didática voltada ao ensino da representação gráfica digital para o projeto de arquitetura, procurando identificar estruturas de saber que suportem os conceitos geométricos empregados em obras da arquitetura contemporânea. Diante dos avanços tecnológicos e da recente inserção do design paramétrico em escritórios e escolas de arquitetura, o estudo propõe reconhecer as técnicas de modelagem paramétrica, relacionadas a tais conceitos. Como método de explicitação das estruturas de saber são adotados os conceitos de taxonomia e ontologia, os quais permitem classificar, hierarquizar e associar os conceitos de geometria e de técnicas de modelagem paramétrica. O estudo também visa contribuir para as reflexões, no ensino de arquitetura, sobre as estratégias projetuais baseadas na geometria utilizada pelos arquitetos contemporâneos, uma vez que as representações paramétricas destas geometrias exigem uma compreensão teórica profunda de seus elementos constituintes.
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Da Costa, Priscila Kabbaz Alves, and Marceli Behm Goulart. "O FEEDBACK E A INTERAÇÃO DO TUTOR ONLINE COM O ALUNO NA DISCIPLINA DE GEOMETRIA EM UM CURSO A DISTÂNCIA." Revista Valore 3 (December 26, 2018): 466–76. http://dx.doi.org/10.22408/reva302018192466-476.

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A tecnologia digital vem como uma aliada dos cursos a distância, apesar disso é essencial que nesta modalidade haja uma interação professor, aluno e tecnologia digital. Para isso retrata-se o processo de interação adotado em uma disciplina de Geometria em um curso de Matemática a distância. Tendo como objetivo compreender qual o espaço do feedback nas atividades de geometria utilizando tecnologias digitais. Para isso optou-se pela pesquisa qualitativa, do tipo estudo de caso e com análise documental. A coleta de dados consistiu nas tarefas postadas pelos alunos e no feedback disponibilizado no ambiente virtual de aprendizagem – AVA da disciplina. O que se evidenciou é que o feedback é fundamental na compreensão do conteúdo quando utilizamos de recursos tecnológicos. Apesar de haver interação tutor x aluno nessa atividade faz-se necessário que está interação seja mais ativa para que o aluno não se sinta só virtualmente.
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ZHANG, Jie-yong, Shou-yi LIU, and Zhong-hai YIN. "Blind digital watermarking method against geometric attack." Journal of Computer Applications 28, no. 9 (June 5, 2009): 2249–51. http://dx.doi.org/10.3724/sp.j.1087.2008.02249.

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Gross, Ari, and Longin Jan Latecki. "Digital geometric methods in document image analysis." Pattern Recognition 32, no. 3 (March 1999): 407–24. http://dx.doi.org/10.1016/s0031-3203(98)00102-2.

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El-Kafrawy, Passent, and Robert McCartney. "Reasoning with geometric information in digital space." Knowledge-Based Systems 18, no. 4-5 (August 2005): 179–86. http://dx.doi.org/10.1016/j.knosys.2004.10.006.

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Havelock, D. I. "Geometric precision in noise-free digital images." IEEE Transactions on Pattern Analysis and Machine Intelligence 11, no. 10 (1989): 1065–75. http://dx.doi.org/10.1109/34.42837.

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Thilmany, Jean. "Digital Tolerence." Mechanical Engineering 132, no. 07 (July 1, 2010): 32–34. http://dx.doi.org/10.1115/1.2010-jul-3.

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This article demonstrates the use of model-based definition (MBD), which can lead to improve productivity and reduce time-to-market. MBD is a method of annotating 3D computer-aided design models with geometric and tolerancing information. With Boeing moving to model-based definition, members of industry have approached the team in Montreal about investigating MBD’s usefulness. Experts believe that the MBD format, if widely adopted, would have implications for inspection. The part would be inspected against the tolerances contained within the CAD model rather than against the 2D engineering drawings, and that would speed the process and potentially make it even more accurate. The cultural change that will have to take place at most engineering companies will be difficult to tackle, and engineering and manufacturing managers know this. A model-based inspection software is being developed to read geometric, dimension, and tolerance information attached to a solid model. This will minimize operator input during development of coordinate measuring machine programs and improve the accuracy and integrity of the inspection process.
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Shao, Gui Ming, and Zhi Hua Hu. "WDFB Digital Watermarking Method Based on Multiscale Geometrie Analysis." Advanced Engineering Forum 6-7 (September 2012): 1145–49. http://dx.doi.org/10.4028/www.scientific.net/aef.6-7.1145.

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Combined with the human visual system and proposes a digital watermarking algorithm based WDFB domain. The algorithm is not the original image and watermark image WDFB coefficient directly superimposed, but the original image WDFB coefficient after pretreatment by the addition criteria to implement the embedded watermark. The experimental results show that the algorithm has strong robustness to shear, median filtering, noise and JPEG compression attacks. WDFB transform a new image analysis method is proposed for the lack of wavelet transform, but the watermarking method that there exist inadequacies; on the one hand, the need to use the original extract the watermark image should be along the zero-watermark the direction of the watermarking algorithm improvements.
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Lin, Lixuan. "Research on Digital Watermarking Algorithm for Anti-geometric Attack." MATEC Web of Conferences 267 (2019): 02007. http://dx.doi.org/10.1051/matecconf/201926702007.

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For the problem that the traditional digital watermarking algorithm is less robustness against geometric attacks, this paper introduces the related content of digital watermarking technology, which combs digital watermarking technology, digital watermarking attack technology and digital watermarking evaluation method, and summarizes the improved algorithms proposed in recent years. Next, the traditional wavelet transform algorithm and the improved algorithm based on DCT transform are selected for comparison experiments. The latter combines Arnold scrambling and SVD decomposition, which has better shear resistance. Finally, combined with the research status, the future research focus of digital watermarking algorithm is prospected.
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Özçakır, Bilal, Ahmet Sami Konca, and Nihat Arıkan. "Children';s Geometric Understanding through Digital Activities: The Case of Basic Geometric Shapes." International Journal of Progressive Education 15, no. 3 (June 3, 2019): 108–22. http://dx.doi.org/10.29329/ijpe.2019.193.8.

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Abar, Celina A. A. Pereira, and Renata Udvary Rodrigues. "GeoGebra e Sala de Aula Invertida: uma possibilidade para a formação continuada de professores no contexto da Matemática." Ensino da Matemática em Debate 7, no. 1 (April 30, 2020): 68–82. http://dx.doi.org/10.23925/2358-4122.2020v7i1p68-82.

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Este artigo apresenta resultados parciais de uma pesquisa de Mestrado Acadêmico em Educação Matemática que teve como objetivo principal verificar se uma formação continuada, para professores do Ensino Fundamental I, sobre Geometria Plana e Espacial, com a utilização de tecnologia digital e no modelo da Sala de Aula Invertida, pode criar condições para a autonomia do professor no que diz respeito à atualização de seus conhecimentos, bem como o aprimoramento de sua prática docente. O trabalho buscou investigar qual é a percepção dos professores quanto à utilização de recursos tecnológicos, incluindo o software GeoGebra como proposta de aprimoramento de seus conhecimentos em Geometria. A formação denominada “Geometria e Ensino Híbrido... Você já ouviu falar?” abordou aspectos teóricos e metodológicos com a utilização de tecnologias digitais na busca do aperfeiçoamento profissional destes professores e evidenciou a viabilidade de sua continuidade, com a adoção de outros modelos de Ensino Híbrido, podendo ser reestruturada para outros professores, outros conteúdos o que, certamente, trará contribuições significativas.
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Diniz Pereira, Fabrine, and Vanda Leci Bueno Gautério. "Percepções de licenciandos em matemática sobre o uso do software Sweet Home 3D para o ensinar matemática." Revista Sergipana de Matemática e Educação Matemática 5, no. 1 (April 22, 2020): 250–67. http://dx.doi.org/10.34179/revisem.v5i1.12033.

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As tecnologias digitais se multiplicam cada vez mais e é para essa realidade que a universidade está preparando os discentes, pois precisamos estar em sincronia com a Era digital. Com esse entendimento, elaborou-se uma oficina para acadêmicos do curso de Licenciatura em Matemática da Universidade Federal do Rio Grande - FURG, que teve como intenção possibilitar a esses a vivência e discussão para a ressignificação da prática docente através da metodologia Ensino por Projetos combinada com o uso da Tecnologia Digital através do software Sweet Home 3D para o ensino de Geometria. Os registros foram produzidos a partir de reflexões construídas pelos licenciandos acerca das atividades e analisados através da técnica de Análise Textual Discursiva (ATD) na perspectiva de Moraes e Galiazzi (2007), no operar do método emergiram três categorias: Planejamento com Tecnologias Digitais; Tecnologias Digitais e os desafios da infraestrutura e da apropriação tecnológica; e Potencialidades das Tecnologias Digitais para o ensinar e o aprender. Nesse estudo foram analisadas as duas últimas categorias e se evidenciou que a falta de infraestrutura adequada e a formação dos professores são desafios a serem enfrentados para que seja possível a utilização das Tecnologias Digitais como potencializadora do ensinar e do aprender matemática.
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Yastikli, Naci, and Esra Guler. "Performance evaluation of thermographic cameras for photogrammetric documentation of historical buildings." Boletim de Ciências Geodésicas 19, no. 4 (December 2013): 711–28. http://dx.doi.org/10.1590/s1982-217020130004000012.

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Thermographic cameras record temperatures emitted by objects in the infrared region. These thermal images can be used for texture analysis and deformation caused by moisture and isolation problems. For accurate geometric survey of the deformations, the geometric calibration and performance evaluation of the thermographic camera should be conducted properly. In this study, an approach is proposed for the geometric calibration of the thermal cameras for the geometric survey of deformation caused by moisture. A 3D test object was designed and used for the geometric calibration and performance evaluation. The geometric calibration parameters, including focal length, position of principal point, and radial and tangential distortions, were determined for both the thermographic and the digital camera. The digital image rectification performance of the thermographic camera was tested for photogrammetric documentation of deformation caused by moisture. The obtained results from the thermographic camera were compared with the results from digital camera based on the experimental investigation performed on a study area.
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Yuan, F., W. J. Qi, and A. P. Fang. "Laboratory geometric calibration of areal digital aerial camera." IOP Conference Series: Earth and Environmental Science 17 (March 18, 2014): 012196. http://dx.doi.org/10.1088/1755-1315/17/1/012196.

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Okita, Yoshio, Yoshikazu Miyanaga, Nobuo Nagai, and Nobuhiro Miki. "ARMA digital lattice filters based on geometric approach." Journal of the Acoustical Society of Japan (E) 8, no. 3 (1987): 85–97. http://dx.doi.org/10.1250/ast.8.85.

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Jeričevic, ŽEljko, Douglas M. Benson, Joseph Bryan, and Louis C. Smith. "Geometric correction of digital images using orthonormal decomposition." Journal of Microscopy 149, no. 3 (March 1988): 233–45. http://dx.doi.org/10.1111/j.1365-2818.1988.tb04581.x.

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Honkavaara, Eija, Eero Ahokas, Juha Hyyppä, Juha Jaakkola, Harri Kaartinen, Risto Kuittinen, Lauri Markelin, and Kimmo Nurminen. "Geometric test field calibration of digital photogrammetric sensors." ISPRS Journal of Photogrammetry and Remote Sensing 60, no. 6 (September 2006): 387–99. http://dx.doi.org/10.1016/j.isprsjprs.2006.04.003.

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Miyachi, Ryoji, Shin Usuki, and Kenjiro T. Miura. "A Digital Grain Generation Method Suitable for Geometric Textures." International Journal of Automation Technology 10, no. 2 (March 4, 2016): 209–13. http://dx.doi.org/10.20965/ijat.2016.p0209.

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The automated production of products using digital data has been realized in recent years through the development of manufacturing machines. Digital data are also used for automatic texturing. In a product texturing system using digital data, texture information needs to be incorporated in the generation of digital data. However, it is difficult to generate such data manually since it is not easy to fit the texture to the product or to prevent the texture pattern from being stretched or shortened. Therefore, what is needed is a method of automatically generating digital data that yields a seamless texture with little distortion and a method of fitting the texture to the product shape. In this paper, the application of the Angle Based Flattening (ABF) method by Sheffer and de Sturler to the generation of digital data of textures is proposed. Another method to extend the ABF technic to make it more suitable to geometric textures is also proposed.
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Mettler, Bérénice, Zhaodan Kong, Chad Goerzen, and Matthew Whalley. "Guidance Performance Benchmarking for Autonomous Rotorcraft." Journal of the American Helicopter Society 59, no. 4 (October 1, 2014): 1–16. http://dx.doi.org/10.4050/jahs.59.042009.

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This paper describes a framework for performance evaluation of autonomous guidance systems. The elements of the framework consist of a set of spatial geometries, flight tasks, performance metrics, a flightdynamic model, and baseline solutions. The spatial benchmarks consist of six tasks in simple geometrical environments and 10 tasks in more complex urban environments based on a real digital terrain elevation map. The framework also includes a set of performance metrics used to compare trajectories. The performance baselines used in the proposed framework are near-optimal solutions computed using one of two trajectory optimization methods: numerical optimization based on nonlinear programming for the simple geometric environments and a motion primitive automaton for problems involving the urban environments. The paper concludes with a demonstration of the benchmarking framework using the Obstacle Field Navigation system developed by the Army Aeroflightdynamics Directorate.
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Cáceres, A. R. E., I. Galobardes, M. S. Rebmann, R. Monte, and A. D. de Figueiredo. "Geometric characterization of polymeric macrofibers." Revista IBRACON de Estruturas e Materiais 8, no. 5 (October 2015): 644–68. http://dx.doi.org/10.1590/s1983-41952015000500006.

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ABSTRACTThe geometric characteristics of synthetic macrofibers are important because they affect the behavior of fiber-reinforced concrete (FRC). Because there is a lack of specific, relevant publications in Brazil, the European standard EN14889-2:2006 was adopted as a reference to perform the characterization. Thus, an experimental plan was developed to assess the adequacy of testing procedures for the qualification of synthetic macrofibers for use in FRC. Two types of macrofibers were evaluated. The length measurement was performed using two methods: the caliper method, which is a manual measurement, and the digital image analysis method using the ImageJ software for image processing. These aforementioned methods were used to determine the diameter together with the density method, which is an indirect method that uses the developed length obtained by one of the previous methods. The statistical analyses revealed that the length results are similar regardless of the method used. However, the macrofibers must be pre-stretched to maximize the accuracy of caliper measurements. The caliper method for diameter determination has the disadvantage of underestimating the macrofiber cross-section because of the pressure applied by the load claws. In contrast, the digital image analysis method obtains the projected diameter in a single plane, which overestimate the diameter because the macrofibers are oriented with the pressure of the scanner cover. Thus, these techniques may result in false projections of the diameters that will depend on the level of torsion in the macrofibers. It was concluded that both the caliper method using previously stretched macrofibers and the digital imaging method can be used to measure length. The density method presented the best results for the diameter determination because these results were not affected by the method chosen to determine the length.
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Wang, Yapeng, Yongcheng Ding, Jianan Wang, and Xi Chen. "Digital Quantum Simulation of Nonadiabatic Geometric Gates via Shortcuts to Adiabaticity." Entropy 22, no. 10 (October 19, 2020): 1175. http://dx.doi.org/10.3390/e22101175.

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Geometric phases are used to construct quantum gates since it naturally resists local noises, acting as the modularized units of geometric quantum computing. Meanwhile, fast nonadiabatic geometric gates are required for reducing the information loss induced by decoherence. Here, we propose a digital simulation of nonadiabatic geometric quantum gates in terms of shortcuts to adiabaticity (STA). More specifically, we combine the invariant-based inverse engineering with optimal control theory for designing the fast and robust Abelian geometric gates against systematic error, in the context of two-level qubit systems. We exemplify X and T gates, in which the fidelities and robustness are evaluated by simulations in ideal quantum circuits. Our results can also be extended to constructing two-qubit gates, for example, a controlled-PHASE gate, which shares the equivalent effective Hamiltonian with rotation around the Z-axis of a single qubit. These STA-inspired nonadiabatic geometric gates can realize quantum error correction physically, leading to fault-tolerant quantum computing in the Noisy Intermediate-Scale Quantum (NISQ) era.
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Villamizar Araque, Freddy Yesid, Olga Lucy Rincón Leal, Mawency Vergel Ortega, and Centro de Investigación y. de Estudios Av Del I. P. N. México, Universidad Francisco de Paula Santander-Colombia. "Diseño de escenarios virtuales para problemas de optimización a través de geometría dinámica. [Design of virtual scenarios for optimization problems using dynamic geometry software]." Revista Logos Ciencia & Tecnología 10, no. 2 (April 1, 2018): 66. http://dx.doi.org/10.22335/rlct.v10i2.571.

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El presente artículo tiene el objetivo de analizar la influencia del uso de tecnologías digitales, particularmente, de software de geometría dinámica, acompañado de una didáctica en la concepción y solución de problemas aplicados, en un enfoque de enseñanza activa, en temas deoptimización. La metodología siguió un enfoque cualitativo, se desarrolló a partir de taller con profesores, en el cual se resolvieron problemas en el contexto de máximos y mínimos de forma analítica y dinámica mediante el software geogebra. Resultados señalan la necesidad de implementar secuencias didácticas que guíen al a la concepción de optimización, la herramienta motiva la fase de enseñanza al permitir la simulación, modifica heurísticas y formas de solucionar un problema. Conclusión: la tecnología digital es factor motivante en la enseñanza, permite la visualización de representaciones de objetos matemáticos de manera dinámica, ayuda a la conceptualización si y solo si se apoya de secuencias didácticas. Palabras clave: escenarios virtuales, geometría dinámica, problemas de optimización, registros de representación. AbstractThe present paper has the objective of analyzing how the use of digital technologies, particularly, a software of dynamic geometry, accompanied by a didactic, serve as support tools to introduce a concept or solve a problem, in an active teaching approach, in the topic of optimization. A workshop was developed with five high school teachers, in which a classic problem was solved in the context of maximums and minimums in an analytical and dynamic way using geogebra software. Results indicate the need to implement didactic sequences that guide the optimization conception; the tool motivates the teaching phase by allowing simulation, modifying heuristics and ways of solving a problem. Conclusion: digital technology is a motivating factor in teaching, allows the visualization of representations of mathematical objects in a dynamic way, and helps the conceptualization if and only if it is supported by didactic sequences.Keywords: virtual scenarios, dynamic geometry, optimization problems, representation registers.ResumoA presente pesquisa tem como objetivo analisar como o uso de tecnologias digitais, em particular, um software de geometria dinâmica, acompanhado por uma didática, servem como ferramentas de suporte para introduzir um conceito ou resolver um problema, em uma abordagem de ensino ativo, em o tema da otimização. Foi desenvolvido um trabalho com cinco professores de bacharelado, no qual um problema foi resolvido no contexto de máximos e mínimos de forma analítica e dinâmica usando o software geogebra. Os resultados indicam a necessidade de implementar sequências didáticas que orientam a concepção de otimização, a ferramenta motiva a fase de ensino, permitindo simulação, modificando heurísticas e formas de resolver um problema. Conclusão: a tecnologia digital é um fator motivador no ensino, permite a visualização de representações de objetos matemáticos de forma dinâmica, ajuda a conceituar se e somente se for apoiada por seqüências didáticas. Palavras-chave: cenários virtuais, geometria dinâmica, problemas de otimização, registros de representação.Palavras-chave: cenários virtuais, geometria dinâmica, problemas de otimização, registros de representação.
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Lei, Wei Dong, Feng Zhao, and Shui Ping Wang. "A Geometric Correction Method in Survey of Geometry Properties of Discontinuities in Rock Masses." Advanced Materials Research 261-263 (May 2011): 1729–33. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.1729.

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A new geometric correction method in processing close range digital photograph is presented. All the critical steps involved in the geometric correction method are briefed and discussed, including determination of Control Points (CP) on the exposure of the rock mass, projection of the 3-D CPs on the exposure of the rock mass to the projection plane, mathematically solving the transformation matrix, geometrically correcting and resampling the digital photograph. As an illustrative example, the whole process of application of the method for a specific digital photograph taken from an outcrop of rock mass is also presented. It is found that the new geometric correction method is effective and more convincing.
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46

Trifunovic, Milan, Milos Stojkovic, Miroslav Trajanovic, Miodrag Manic, Dragan Misic, and Nikola Vitkovic. "Analysis of semantic features in free-form objects reconstruction." Artificial Intelligence for Engineering Design, Analysis and Manufacturing 30, no. 1 (April 30, 2015): 44–63. http://dx.doi.org/10.1017/s0890060415000153.

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AbstractOne of the biggest challenges associated with design and digital reconstruction of free forms comes from uniqueness and unrepeatability of these shapes. During digital reconstruction of these forms, the designer has to choose the right set of geometric features and then compose them in a way that will enable the most accurate reconstruction of the geometry. While doing this, the designer primarily relies on personal experience gained through work with free-form objects of similar geometry. In our opinion, the analysis of free-form objects geometry should rely upon semantic interpretation of their geometric and other features, and the greatest challenge of automation of digital reconstruction and free-form object design in general is closely related to automation of semantic interpretation of geometric and other free-form object features. In this paper, a case of chest bone implant digital reconstruction is presented, where a new semantic model called the active semantic model was used for modeling the meaning of geometric elements, that is, the semantic features of a free-form object. The active semantic model and its analogy-based reasoning algorithms have shown themselves as applicable for the automation of semantic interpretation of the unique, unrepeatable, and unpredictable forms of chest bone. Moreover, this semantic model showed the potential to help automate selecting and composing of geometric features for efficient digital reconstruction of the geometry of free forms.
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Weimer, Daniel, Silke Huferath von Luepke, Andreas Tausendfreund, Ralf B. Bergmann, Gert Goch, and Bernd Scholz-Reiter. "Dimensional In Situ Shape and Surface Inspection of Metallic Micro Components in Micro Bulk Manufacturing." Advanced Materials Research 1018 (September 2014): 493–500. http://dx.doi.org/10.4028/www.scientific.net/amr.1018.493.

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A rising trend to miniaturization and function integration requires new materials, tools, manufacturing setups and quality inspection strategies for mass production of micro mechanical systems (MMS). In most scenarios, quality inspection is carried out manually. An expert takes samples out of the manufacturing process and investigates them by means of tactile or optical measurement systems. This time consuming quality inspection process leads to low inspection rates, especially in bulk manufacturing processes, where manufacturing frequencies of 400 parts per minute are common. This contribution introduces an automated optical quality inspection method based on a digital holographic system, which acquires 2D texture and 3D shape information in one single measurement step. Based on 3D data, an automated point separation algorithm splits the measured object shape into elementary geometries and calculates form and position deviations compared to an object model. In the final step, a 2D surface inspection procedure based on multi-scale texture analysis detects surface defects with respect to the separated elementary geometries and fuses the result from the 3D shape and the 2D texture analysis to a final rejection decision. The capability of the proposed quality inspection method is demonstrated in a micro cold forming scenario, where a micro cup smaller than 1 mm in all geometric dimensions is the object under investigation.
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Agugiaro, Giorgio, Fabio Remondino, Gabrio Girardi, Jennifer Von Schwerin, Heather Richards-Rissetto, and Raffaele De Amicis. "QueryArch3D: Querying and Visualising 3D Models of a Maya Archaeological Site in a Web-Based Interface." Geoinformatics FCE CTU 6 (December 21, 2011): 10–17. http://dx.doi.org/10.14311/gi.6.2.

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Constant improvements in the field of surveying, computing and distribution of digital-content are reshaping the way Cultural Heritage can be digitised and virtually accessed, even remotely via web. A traditional 2D approach for data access, exploration, retrieval and exploration may generally suffice, however more complex analyses concerning spatial and temporal features require 3D tools, which, in some cases, have not yet been implemented or are not yet generally commercially available. Efficient organisation and integration strategies applicable to the wide array of heterogeneous data in the field of Cultural Heritage represent a hot research topic nowadays. This article presents a visualisation and query tool (QueryArch3D) conceived to deal with multi-resolution 3D models. Geometric data are organised in successive levels of detail (LoD), provided with geometric and semantic hierarchies and enriched with attributes coming from external data sources. The visualisation and query front-end enables the 3D navigation of the models in a virtual environment, as well as the interaction with the objects by means of queries based on attributes or on geometries. The tool can be used as a standalone application, or served through the web. The characteristics of the research work, along with some implementation issues and the developed QueryArch3D tool will be discussed and presented.
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Muhtadan, Muhtadan. "EKSTRAKSI CIRI CACAT PENGELASAN PADA CITRA DIGITAL FILM RADIOGRAFI MENGGUNAKAN GEOMETRIC INVARIANT MOMENT DAN STATISTICAL TEXTURE." Jurnal Forum Nuklir 3, no. 2 (November 1, 2009): 83. http://dx.doi.org/10.17146/jfn.2009.3.2.3296.

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EKSTRAKSI CIRI CACAT PENGELASAN PADA CITRA DIGITAL FILM RADIOGRAFI MENGGUNAKAN GEOMETRIC INVARIANT MOMENT DAN STATISTICAL TEXTURE. Penelitian ini dilakukan untuk mendapatkan ekstraksi ciri cacat pengelasan pada citra digital film radiografi dengan menggunakan metode geometric invariant moment dan statistical texture. Nilai ekstraksi ciri ini dapat dimanfaatkan sebagai nilai yang digunakan dalam melakukan klasifikasi dan pengenalan pola cacat pada interpretasi cacat pengelasan citra digital film radiografi secara otomatis oleh komputer. Jenis cacat yang digunakan dalam penelitian ini adalah longitudinal crack, transversal crack, distributed porosity, clustered porosity, wormhole dan tanpa cacat (no defect). Sebagai bahan penelitian digunakan citra digital film radiografi dengan keenam jenis defektologi tersebut. Langkah yang dilakukan yaitu dengan membuat program untuk membaca citra digital, kemudian melakukan pemotongan citra (cropping) untuk melokalisasi letak cacat kemudian menghitung nilai momen dengan persamaan metode geometric invariant moment dan statistical texture. Hasil penelitian berupa nilai-nilai ekstraksi ciri yang telah diuji dengan perlakuan RST(rotation, scale, transformation) dan diperoleh nilai momen yang paling invariant terhadap RST yaitu momen f3, f4, f5 dari metode geometric invariant moment . Sedangkan dari metode statistical texture digunakan seluruh nilaisebagai hasil ekstraksi ciri yaitu intensitas rerata , kontras rerata, smoothness, 3rdmoment, uniformity, dan entropy
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De Vieilleville, François, Jacques-Olivier Lachaud, and Fabien Feschet. "Convex Digital Polygons, Maximal Digital Straight Segments and Convergence of Discrete Geometric Estimators." Journal of Mathematical Imaging and Vision 27, no. 2 (February 2007): 139–56. http://dx.doi.org/10.1007/s10851-007-0779-x.

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