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Dissertations / Theses on the topic 'Rotation Invariance'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Pflug, Karen. "Generalized scale invariance, differential rotation and cloud texture." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61076.

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The standard 2D/3D picture of atmospheric dynamics of two distinct isotropic regimes separated by a "meso-scale gap" has been seriously questioned in recent years. Using satellite cloud images and the formalism of generalized scale invariance (GSI), we test the contrary hypothesis that cloud radiance fields are scaling in the range 1-1000 km.<br>Using a two-dimensional representation of GSI and three new analysis techniques, we test the following relation for each picture: $ langle vert F( lambda sp{ tilde G} vec k) vert sp2 rangle = lambda sp{-s} langle vert F( vec k) vert sp2 rangle$, where

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Liu, Kun [Verfasser], and Olaf [Akademischer Betreuer] Ronneberger. "Fourier based rotation invariance and biological image analysis : rotation invariant description and detection, and cell segmentation = Fourier-Rotationsinvarianz und biologische Bildanalyse : rotationsinvariante Beschreibung und Erkennung, und Zellsegmentierung." Freiburg : Universität, 2014. http://d-nb.info/1114829412/34.

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Mach, Taylor Joseph. "Accurate Prediction of Chiroptical Properties." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64301.

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Accurate theoretical predictions of optical rotation are of substantial utility to the chemical community enabling the determination of absolute configuration without the need for poten- tially lengthy total synthesis. The requirements for robust calculation of gas-phase optical rotation are well understood, but too expensive for routine use. In an effort to reduce this cost we have examined the performance of the LPol and ORP basis sets, created for use in density functional theory calculations of optical rotation, finding that at the coupled cluster level of theory they perform the same or b

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Auquiert, Philippe. "Interpolation de points par des splines L1 régulières." Valenciennes, 2007. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/dbb6bf8c-16db-468e-9636-4462263ac6b8.

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En 2000, Lavery sur des exemples a remarqué que les splines cubiques L1 interpolantes C1 semblent avoir une aptitude particulière à préserver la forme des données lors de changements brusques d’ordonnées et d’espaces entre les points. Ses méthodes et ses résultats sont le point de départ de cette thèse. Dans un premier temps, nous démontrons que, dans le cas d’une fonction de type Heaviside f, pour au moins trois points appartenant à f situés avant la discontinuité et au moins trois points après, il existe une unique spline cubique L1 interpolante C1. Celle-ci coïncide avec la fonction f sauf

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Poulenard, Adrien. "Structures for deep learning and topology optimization of functions on 3D shapes." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX007.

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Le domaine du traitement de la géométrie suit un cheminement similaire à celui de l'analyse d'images avec l'explosion des publications consacrées à l'apprentissage profond ces dernières années. Un important effort de recherche est en cours pour reproduire les succès de l'apprentissage profond dans le domaine de la vision par ordinateur dans le contexte de l'analyse de formes 3D. Contrairement aux images, les formes 3D peuvent peuvent être représentées de différentes manières comme des maillages ou des nuages de points souvent dépourvus d'une structure canonique. Les algorithmes d'apprentissage

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Vieira, Raissa Tavares. "Descritores robustos à rotação de texturas baseados na abordagem LMP com acréscimo da informação de Magnitude e Sinal." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18152/tde-04102017-110333/.

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Classificação de imagens de textura, especialmente aquelas com mudanças significativas de rotação, iluminação, escala e ponto de vista, é um problema fundamental e desafiador na área de visão computacional. Esta tese propõe dois descritores de imagem simples, porém eficientes, chamados de Sampled Local Mapped Pattern Magnitude (SLMP_M) e Completed Local Mapped Pattern (CLMP) aplicados na classificação de textura. Os descritores propostos são parte de um aprimoramento do descritor Local Mapped Pattern (LMP) para trabalhar de maneira eficiente com imagens de textura rotacionadas. Os métodos prop

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Mazetti, Cristina Mônica Dornelas. "Metodologia para extração de características invariantes à rotação em imagens de impressões digitais." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-03032007-085126/.

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O objetivo deste trabalho é apresentar algoritmos aplicados para extração de características invariantes à rotação em imagens de impressões digitais. No pré-processamento da imagem utiliza-se detecção de bordas pelo detector de Canny tendo como resultado uma imagem binarizada e afinada. Na extração das minúcias a metodologia adotada é o número de cruzamentos (CN), que extrai os aspectos locais, tais como, as minúcias fim de linha e bifurcações. A direção das cristas locais não é utilizada porque nas imagens rotacionadas a condição de permanência das propriedades biométricas não são satisfeitas

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Minařík, Martin. "Strukturální metody identifikace objektů pro řízení průmyslového robotu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-233840.

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This PhD thesis deals with the use of structural methods of objects identification for industrial robots operation. First, the present state of knowledge in the field is described, i.e. the whole process of objects recognition with the aid of common methods of the syntactic analysis. The main disadvantage of these methods is that is impossible to recognize objects whose digitalized image is corrupted in some ways (due to excessive noise or image disturbances), objects are therefore deformed. Further, other methods for the recognition of deformed objects are described. These methods use structu

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Galante, Annamaria. "Studio di CNNs sferiche per l'apprendimento di descrittori locali su Point Cloud." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18680/.

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Nell'ambito della Computer Vision assume sempre maggiore importanza la 3D Computer Vision. Diversi sono i task e le applicazioni della 3D CV, così come diverse sono le possibili rappresentazioni dei dati. Molti di questi task richiedono la ricerca di corrispondenze tra due o più scene\oggetti 3D. Queste corrispondenze vengono individuate tramite il paradigma di Feature Matching, composto da tre step: detection, description, matching. Le performance della pipe line di feature matching sono strettamente correlate alle tecniche utilizzate in fase di description. La creazione di descriptor c

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Safia, Abdelmounaime. "Développement d’un modèle d’analyse de texture multibande." Thèse, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5990.

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Résumé : En télédétection, la texture facilite l’identification des classes de surfaces sur des critères de similitude d’organisation spatiale des pixels. Les méthodes d’analyse texturale utilisées en télédétection et en traitement d’image en général sont principalement proposées pour extraire la texture dans une seule bande à la fois. Pour les images multispectrales, ceci revient à extraire la texture dans chaque bande spectrale séparément. Cette stratégie ignore la dépendance qui existe entre la texture des différentes bandes (texture inter-bande) qui peut être une source d’information addit

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Bridge, Christopher. "Computer-aided analysis of fetal cardiac ultrasound videos." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:c9cad151-6f08-461a-acd6-9fd63477b91a.

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This thesis addresses the task of developing automatic algorithms for analysing the two-dimensional ultrasound video footage obtained from fetal heart screening scans. These scans are typically performed in the second trimester of pregnancy to check for congenital heart anomalies and require significant training and anatomical knowledge to perform. The aim is to develop a tool that runs at high frame rates with no user initialisation and infers the visibility, position, orientation, view classification, and cardiac phase of the heart, and additionally the locations of cardiac structures of int

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Tetelin, Arthur. "Reconstruction des variables vectorielles dans le cadre des méthodes volumes finis sur maillages non-structurés généraux." Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0029.

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Les simulations numériques dans le domaine de l’énergétique peuvent présenter de forts gradients et des discontinuités, ainsi qu’une forte disparité d’échelles spatiales et temporelles. C’est typiquement le cas des simulations menées avec le code Cedre, développé par le département multi-physique pour l’énergétique de l’ONERA. Il est donc nécessaire de développer des méthodes numériques précises, robustes et performantes. Dans ce cadre, la reconstruction des variables aux faces des volumes de contrôle est l’un des éléments clé de la résolution des équations de conservation hyperboliques dans l

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Saive, Yannick. "DirCNN: Rotation Invariant Geometric Deep Learning." Thesis, KTH, Matematisk statistik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-252573.

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Recently geometric deep learning introduced a new way for machine learning algorithms to tackle point cloud data in its raw form. Pioneers like PointNet and many architectures building on top of its success realize the importance of invariance to initial data transformations. These include shifting, scaling and rotating the point cloud in 3D space. Similarly to our desire for image classifying machine learning models to classify an upside down dog as a dog, we wish geometric deep learning models to succeed on transformed data. As such, many models employ an initial data transform in their mode

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Sapounas, D. "A novel approach to rotation invariant correlation." Thesis, Cranfield University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283306.

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SALIS, FILIPPO. "The geometry of rotation invariant Kähler metrics." Doctoral thesis, Università degli Studi di Cagliari, 2018. http://hdl.handle.net/11584/255956.

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The present thesis consists of three results related to the geometry of rotation invariant Kähler metrics. In the first one, we prove that a 3-codimensional Kähler-Einstein submanifold of the complex projective space with rotation invariant metric is forced to be the product of complex projective spaces. In the second one, we prove that the only stable-projectively induced Ricci-flat Kähler metrics are flat. Finally, we prove as third result that given a Ricciflat radial Kähler metric defined on a complex surface such that the third coefficient of its Tian-Yau-Zelditch expansion vanishes, the

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Liu, Yan. "Rotation, scaling and translation invariant digital image watermarking." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26699.

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Many digital image watermarking schemes have been proposed and are robust to common signal processing, such as compression and filtering. Geometric distortions, such as rotation, scaling, and translation (RST), are considered the most challenging attacks. This thesis is on RST invariant digital image watermarking. In this thesis, we introduce the fundamental theories and techniques necessary for RST invariant digital image watermarking, and briefly review the existing RST invariant image watermarking schemes. Then, we propose an image rectification scheme for RST invariant digital image waterm

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Jäger, T., and A. Passeggi. "On torus homeomorphisms semiconjugate to irrational rotations." Cambridge University Press, 2015. https://tud.qucosa.de/id/qucosa%3A39051.

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In the context of the Franks–Misiurewicz conjecture, we study homeomorphisms of the two-torus semiconjugate to an irrational rotation of the circle. As a special case, this conjecture asserts uniqueness of the rotation vector in this class of systems. We first characterize these maps by the existence of an invariant ‘foliation’ by essential annular continua (essential subcontinua of the torus whose complement is an open annulus) which are permuted with irrational combinatorics. This result places the considered class close to skew products over irrational rotations. Generalizing a well-known r

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Ho, Purdy P. (Purdy Pinpin) 1977. "Rotation invariant real-time face detection and recognition system." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86709.

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Woo, Myung Chul. "Biologically-inspired translation, scale, and rotation invariant object recognition models /." Online version of thesis, 2007. http://hdl.handle.net/1850/3933.

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Wu, Jiahua. "Rotation invariant classification of 3D surface texture using photometric stereo." Thesis, Heriot-Watt University, 2003. http://hdl.handle.net/10399/293.

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Acuña, Mauricio Andrés Barrera. "Rotation-invariant texture classification based on graylevel co-occurrence matrices." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-09072014-110549/.

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Texture is one of the most primitive characteristics of objects. Digital images represent this property as local intensity variations in the image. Consequently, texture is an attribute that is innately present in virtually every digital image; mathematically describing this information leads to a myriad of different applications, from food qualities processing up to medical image analysis. It comes as no surprise that texture has been one of the most researched topics in the computer vision community, and it continues to receive a great deal of attention. One of the most classic approaches to

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Lu, Ping. "Rotation Invariant Registration of 2D Aerial Images Using Local Phase Correlation." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-199588.

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Aerial image registration requires a high degree of precision. In order to improve the accuracy of feature-based registration, this project proposes a novel Log-Polar Transform (LPT) based image registration. Instead of using the whole image in the conventional method, feature points are used in this project, which reduces the computational time. For rotation invariance, it is not important how the image patch is rotated. The key is focusing on the feature points. So a circular image patch is used in this project, instead of using square image patches as used in previous methods. Existing tech

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Fountain, Stephanie. "Rotation invariant texture analysis for the retrieval and annotation of image databases." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302323.

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Mathew, Alex. "Rotation Invariant Histogram Features for Object Detection and Tracking in Aerial Imagery." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1397662849.

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Herrmann, Sven. "A Michelson-Morley test of Lorentz invariance using a rotating optical cavity." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15751.

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Diese Arbeit präsentiert ein modernes Michelson-Morley Experiment, welches genauere Grenzwerte für Testparameter liefert, die eine Verletzung der Lorentzinvarianz modellieren. Die Messung setzt einen oberen Grenzwert für eine Anisotropie der Lichtgeschwindigkeit im Bereich von dc/c ~10^-16. Das Experiment vergleicht die Frequenzen zweier optischer Hoch-Finesse Resonatoren, wobei einer dieser Resonatoren kontinuierlich auf einem Drehtisch rotiert. Um die Eigenfrequenzen der Resonatoren abzufragen, werden die Frequenzen zweier Nd:YAG-Laser auf die Resonatoren stabilisiert. Die relative

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Gretillat, Jean-David. "Modification de l'algorithme de la transformée en ondelettes discrète pour l'obtention d'une représentation invariante sous rotation." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23646/23646.pdf.

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Erturk, Alp. "Rotation, Scale And Translation Invariant Automatic Target Recognition Using Template Matching For Satellite Imagery." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611434/index.pdf.

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In this thesis, rotation, scale and translation (RST) invariant automatic target recognition (ATR) for satellite imagery is presented. Template matching is used to realize the target recognition. However, unlike most of the studies of template matching in the literature, RST invariance is required in our problem, since most of the time we will have only a small number of templates of each target, while the targets to be recognized in the scenes will have various orientations, scaling and translations. RST invariance is studied in detail and implemented with some of the competing methods in the

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Pratt, John Graham le Maistre. "Application of the Fourier-Mellin transform to translation-, rotation- and scale-invariant plant leaf identification." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33440.

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The Fourier-Mellin transform was implemented on a digital computer and applied towards the recognition and differentiation of images of plant leaves regardless of translation, rotation or scale. Translated, rotated and scaled leaf images from seven species of plants were compared: avocado ( Persea americana), trembling aspen (Populus tremuloides), lamb's-quarter (Chenopodium album), linden (Tilla americana), silver maple (Acer saccharinum), plantain (Plantago major) and sumac leaflets (Rhus typhina ). The rate of recognition was high among translated and rotated leaf images for all plant speci

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Heywood, M. I. "A practical framework for training sigma-pi neural networks with an application in rotation invariant pattern recognition." Thesis, University of Essex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241204.

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Jhinaoui, Ahmed. "Subspace-based identification and vibration monitoring algorithms for rotating systems." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S161.

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Les méthodes d'identiﬁcation dites sous-espace sont largement utilisées pour la caractérisation des modes propres et la surveillance des structures mécaniques. Elles ont fait leurs preuves pour les systèmes dont la dynamique est invariante dans le temps. Elles ne sont, toutefois, pas adaptées à des systèmes à rotors comme les hélicoptères et les éoliennes qui, de part leurs parties tournantes, sont périodiques dans le temps. Le but de cette thèse est d'étendre le champ d'application de ces méthodes à cette classe particulière de systèmes. Tout d'abord, un algorithme qui permet d'identiﬁer cert

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Ras, Marthinus Nicolaas. "The development of some rotationally invariant population based optimization methods." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80172.

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Thesis (MScEng)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: In this study we consider the lack of rotational invariance of three different population based optimization methods, namely the particle swarm optimization (PSO) algorithm, the differential evolution (DE) algorithm and the continuous-parameter genetic algorithm (CPGA). We then propose rotationally invariant versions of these algorithms. We start with the PSO. The so-called classical PSO algorithmis known to be variant under rotation, whereas the linear PSO is rotationally invariant. This invariance however, comes at the

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Triestino, Michele. "La dynamique des difféomorphismes du cercle selon le point de vue de la mesure." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2014. http://tel.archives-ouvertes.fr/tel-01065468.

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Les travaux de ma thèse s'articulent en trois parties distinctes.Dans la première partie j'étudie les mesures de Malliavin-Shavguldize sur les difféomorphismes du cercle et de l'intervalle. Il s'agit de mesures de type " Haar " pour ces groupes de dimension infinie : elles furent introduites il a une vingtaine d'années pour permettre une étude de leur théorie des représentations. Un premier chapitre est dédié à recueillir les résultats présents dans la littérature et et les représenter dans une forme plus étendue, avec un regard particulier sur les propriétés de quasi-invariance de ces mesures

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Kesler, Joseph Michael. "Automated Alignment of Aircraft Wing Radiography Images Using a Modified Rotation, Scale, and Translation Invariant Phase Correlation Algorithm Employing Local Entropy for Peak Detection." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1218604857.

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Erkers, Julia. "Towards automatic smartphone analysis for point-of-care microarray assays." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-280663.

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Poverty and long distances are two reasons why some people in the third world countries hasdifficulties seeking medical help. A solution to the long distances could be if the medical carewas more mobile and diagnostically tests could be performed on site in villages. A new pointof-care test based on a small blood shows promising results both in run time and mobility.However, the method still needs more advanced equipment for analysis of the resultingmicroarray. This study has investigated the potential to perform the analysis within asmartphone application, performing all steps from image capt

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Accordino, Andrea. "Studio e sviluppo di descrittori locali per nuvole di punti basati su proprietà geometriche." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17919/.

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In questo lavoro sono stati proposti due nuovi descrittori per cloud point: ReSHOT e KPL-Descriptor. Inoltre sono state testate delle idee per migliorare le performance di tutta la pipeline di feature matching. Il lavoro comprende una fase di comparazione con i descrittori preesistenti.

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Pedone, M. (Matteo). "Algebraic methods for constructing blur-invariant operators and their applications." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526208770.

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Abstract Image acquisition devices are always subject to physical limitations that often manifest as distortions in the appearance of the captured image. The most common types of distortions can be divided into two categories: geometric and radiometric distortions. Examples of the latter ones are: changes in brightness, contrast, or illumination, sensor noise and blur. Since image blur can have many different causes, it is usually not convenient and also computationally expensive to develop ad hoc algorithms to correct each specific type of blur. Instead, it is often possible to extract a blur

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Fife, Wade S. "Improved Stereo Vision Methods for FPGA-Based Computing Platforms." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2745.

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Stereo vision is a very useful, yet challenging technology for a wide variety of applications. One of the greatest challenges is meeting the computational demands of stereo vision applications that require real-time performance. The FPGA (Field Programmable Gate Array) is a readily-available technology that allows many stereo vision methods to be implemented while meeting the strict real-time performance requirements of some applications. Some of the best results have been obtained using non-parametric stereo correlation methods, such as the rank and census transform. Yet relatively little wor

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Norman, Jacob. "3D POSE ESTIMATION IN THE CONTEXT OF GRIP POSITION FOR PHRI." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55166.

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For human-robot interaction with the intent to grip a human arm, it is necessary that the ideal gripping location can be identified. In this work, the gripping location is situated on the arm and thus it can be extracted using the position of the wrist and elbow joints. To achieve this human pose estimation is proposed as there exist robust methods that work both in and outside of lab environments. One such example is OpenPose which thanks to the COCO and MPII datasets has recorded impressive results in a variety of different scenarios in real-time. However, most of the images in these dataset

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Hamsici, Onur C. "Bayes Optimality in Classification, Feature Extraction and Shape Analysis." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1218513562.

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Wen-ChiaLee and 李文加. "A Study on Template Matching with Rotation Invariance." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/16350988377752907645.

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博士<br>國立成功大學<br>電腦與通信工程研究所<br>101<br>Template matching is a technique used in signal and image processing. It searches all possible positions of a template in a scene image by moving a template, and computing the similarity measures between them. One of the existing problems in template matching is when rotated objects exist in a scene image. Hence, this thesis discusses many rotation invariance techniques used in template matching and proposes two different approaches for fast template matching with rotation invariance. In the first approach, a fast template matching method with subpixel accu

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Huang, Yi-Hong, and 黃逸泓. "A Rotation Invariance Singular Point Detection Algorithm on a Fingerprint Verification System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/95355181004209072891.

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碩士<br>清雲科技大學<br>電機工程研究所<br>95<br>A robust fingerprint singular point detection algorithm with rotation-invariant ability is proposed. Two 7x7 templates of core and delta are constructed from the orientation map of a fingerprint that is formed by using Sobel operators. The differences between the value of central element and those of the outer ring’s 24 elements of the template are calculated. Since the variations of the orientations around the singular point are greater than those of others, singular point can be correctly detected by comparing the 24 database . The algorithm has the merit to

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Vácha, Pavel. "Indexace obrazové databáze." Doctoral thesis, 2011. http://www.nusl.cz/ntk/nusl-296122.

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Ongoing expansion of digital images requires new methods for sorting, browsing, and sear- ching through huge image databases. This is a domain of Content-Based Image Retrieval (CBIR) systems, which are database search engines for images. A user typically submit a query image or series of images and the CBIR system tries to find and to retrieve the most similar images from the database. Optimally, the retrieved images should not be sensitive to circumstances during their acquisition. Unfortunately, the appearance of natural objects and materials is highly illumination and viewpoint dependent. T

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Bodapati, Spandana. "Scale-invariant and rotation-invariant image watermarking." 2005. http://digital.library.okstate.edu/etd/umi-okstate-1304.pdf.

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CHOUDHARY, SUCHITRA. "ROTATION AND SCALE INVARIANT OBJECT DETECTION." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15016.

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Object Detection is the significant research area in the field of Computer Vision and Image Processing. Humans possess ability to quickly identify things just by looking at them. As humans, machines do not possess this intelligence for identifying objects in the scene. Object detection refers to the process of examining the images to determine the presence and location of the object. For detecting the object, machine need to possess the prior knowledge about the object i.e. model object. The task of detecting object in arbitrary environment is challenging for variety of reasons. The occurrence

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Agarwal, Anubhav, and Madhukar Manohar. "Rotation and Scale Invariant Texture Classification." Thesis, 2008. http://ethesis.nitrkl.ac.in/75/1/10407008.pdf.

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Texture classification is very important in image analysis. Content based image retrieval, inspection of surfaces, object recognition by texture, document segmentation are few examples where texture classification plays a major role. Classification of texture images, especially those with different orientation and scale changes, is a challenging and important problem in image analysis and classification. This thesis proposes an effective scheme for rotation and scale invariant texture classification. The rotation and scale invariant feature extraction for a given image involves applying a log

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Lin, You-Tsai, and 林猷財. "Image Rotation Angle Estimation Using Rotation Invariant Features of Zernike Moments." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/10622265211779462331.

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碩士<br>國立交通大學<br>電機與控制工程系<br>89<br>An estimation approach of image rotation angle is proposed here. A basic assumption that the center of image rotation must be known is made, so that we can estimate the precise image rotation angles from the comparison between the rotated images and the reference one. Furthermore, the Zernike moment algorithm with subsampling and interpolation techniques can increase the image resolution and compute Zernike moments more accurately on the premise that keep the image acquiring hardware instrument unchanged. In addition, a K-means clustering algorithm is used to

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"Rotation-invariant face detection in grayscale images." 2005. http://library.cuhk.edu.hk/record=b5892397.

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Zhang Wei.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2005.<br>Includes bibliographical references (leaves 73-78).<br>Abstracts in English and Chinese.<br>Abstract --- p.i<br>Acknowledgement --- p.ii<br>List of Figures --- p.viii<br>List of Tables --- p.ix<br>Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Previous work --- p.2<br>Chapter 1.1.1 --- Learning-based approaches --- p.3<br>Chapter 1.1.2 --- Feature-based approaches --- p.7<br>Chapter 1.2 --- Thesis objective --- p.12<br>Chapter 1.3 --- The proposed detector --- p.13<br>Chapter 1.4 --- Thesis outline ---

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Yokono, Jerry Jun, and Tomaso Poggio. "Rotation Invariant Object Recognition from One Training Example." 2004. http://hdl.handle.net/1721.1/30465.

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Local descriptors are increasingly used for the task of object recognition because of their perceived robustness with respect to occlusions and to global geometrical deformations. Such a descriptor--based on a set of oriented Gaussian derivative filters-- is used in our recognition system. We report here an evaluation of several techniques for orientation estimation to achieve rotation invariance of the descriptor. We also describe feature selection based on a single training image. Virtual images are generated by rotating and rescaling the image and robust features are selected. The results c

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Cheng-Hao, Yao, and 姚正浩. "Translation, rotation and scale invariant color texture retrieval." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/12078041107303029610.

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碩士<br>元智大學<br>資訊工程學系<br>89<br>A new method for color texture retrieval using color and edge features is proposed in this study. The proposed method unifies color and edge features rather than simply extend gray-level texture analysis to each channel of the color images, or analyze only color characteristics. More specifically, the distributions of color and local edge patterns are used to derive similarity measure of a pair of textured regions for color texture retrieval. Moreover, a segmentation method based on the similarity measure is employed to extend the retrieval method to natural image

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Chao, Y. J., and 趙永正. "Limited rotation-invariant character recognition via feature extraction." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/27387804960292874507.

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碩士<br>國立臺灣科技大學<br>工程技術研究所<br>82<br>A method of constructing a modified circular harmonic filter using the feature extraction approach to recognize limited, rotative characters is proposed.The proposed method does not only improve the recognition ability of the filter for the rotated pattern ,but also could decrease the number of filters. Due to the fact that the constructing procedure of the method is straightforward and experimental equipments are limited,we expect a great potential of thi

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