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Tesi sul tema "Image compression"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Hawary, Fatma. "Light field image compression and compressive acquisition." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S082.

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En capturant une scène à partir de plusieurs points de vue, un champ de lumière fournit une représentation riche de la géométrie de la scène, ce qui permet une variété de nouvelles applications de post-capture ainsi que des expériences immersives. L'objectif de cette thèse est d'étudier la compressibilité des contenus de type champ de lumière afin de proposer de nouvelles solutions pour une imagerie de champs lumière à plus haute résolution. Deux aspects principaux ont été étudiés à travers ce travail. Les performances en compression sur les champs lumière des schémas de codage actuels étant e

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2

Obaid, Arif. "Range image compression." Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10131.

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Range Images, which are a representation of the surface of a 3-D object, are gaining popularity in many applications including CAD/CAM, multimedia and virtual reality. There is, thus, a need for compression of these 3-D images. Current standards for still image compression, such as JPEG, are not appropriate for such images because they have been designed specifically for intensity images. This has led us to develop a new compression method for range images. It first scans the image so that the pixels are arranged into a sequence. It then approximates this sequence by straight line segments wit

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3

Lacroix, Bruno. "Fractal image compression." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ36939.pdf.

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4

Aydinoğlu, Behçet Halûk. "Stereo image compression." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/15447.

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5

Abdul-Amir, Said. "Digital image compression." Thesis, De Montfort University, 1985. http://hdl.handle.net/2086/10681.

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Due to the rapid growth in information handling and transmission, there is a serious demand for more efficient data compression schemes. compression schemes address themselves to speech, visual and alphanumeric coded data. This thesis is concerned with the compression of visual data given in the form of still or moving pictures. such data is highly correlated spatially and in the context domain. A detailed study of some existing data compression systems is presented, in particular, the performance of DPCM was analysed by computer simulation, and the results examined both subjectively and objec

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6

Hallidy, William H. Jr, and Michael Doerr. "HYPERSPECTRAL IMAGE COMPRESSION." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608744.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Systems & Processes Engineering Corporation (SPEC) compared compression and decompression algorithms and developed optimal forms of lossless and lossy compression for hyperspectral data. We examined the relationship between compression-induced distortion and additive noise, determined the effect of errors on the compressed data, and showed that the data could separate targets from clutter after more than 50:1 compression.

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7

Hernández-Cabronero, Miguel. "DNA Microarray Image Compression." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/297706.

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En los experimentos con DNA microarrays se genran dos imágenes monocromo, las cuales es conveniente almacenar para poder realizar análisis más precisos en un futuro. Por tanto, la compresión de imágenes surge como una herramienta particularmente útil para minimizar los costes asociados al almacenamiento y la transmisión de dichas imágenes. Esta tesis tiene por objetivo mejorar el estado del arte en la compresión de imágenes de DNA microarrays. Como parte de esta tesis, se ha realizado una detallada investigación de las características de las imágenes de DNA microarray. Los resultados experi

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8

Agostini, Luciano Volcan. "Projeto de arquiteturas integradas para a compressão de imagens JPEG." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2002. http://hdl.handle.net/10183/11431.

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Esta dissertação apresenta o desenvolvimento de arquiteturas para a compressão JPEG, onde são apresentadas arquiteturas de um compressor JPEG para imagens em tons de cinza, de um compressor JPEG para imagens coloridas e de um conversor de espaço de cores de RGB para YCbCr. As arquiteturas desenvolvidas são detalhadamente apresentadas, tendo sido completamente descritas em VHDL, com sua síntese direcionada para FPGAs da família Flex10KE da Altera. A arquitetura integrada do compressor JPEG para imagens em tons de cinza possui uma latência mínima de 237 ciclos de clock e processa uma imagem de 6

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9

Nicholl, Peter Nigel. "Feature directed spiral image compression : (a new technique for lossless image compression)." Thesis, University of Ulster, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339326.

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10

Mandal, Mrinal Kumar. "Wavelets for image compression." Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10277.

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Wavelets are becoming increasingly important in image compression applications because of its flexibility in representing nonstationary signals. To achieve a high compression ratio, the wavelet has to be adapted to the image. Current techniques use exhaustive search procedures which are computationally intensive to find the optimal basis (type/order/tree) for the image to be coded. In this thesis, we have carried out extensive performance analysis of various wavelets on a wide variety of images. Based on the investigation, we propose some guidelines for searching for the optimal wavelet (type/

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11

Jiang, Qin. "Stereo image sequence compression." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/15634.

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12

Fawcett, Roger James. "Efficient practical image compression." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365711.

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13

Rajpoot, Nasir Mahmood. "Adaptive wavelet image compression." Thesis, University of Warwick, 2001. http://wrap.warwick.ac.uk/67099/.

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In recent years, there has been an explosive increase in the amount of digital image data. The requirements for its storage. and communication can be reduced considerably by compressing the data while maintaining their visual quality. The work in this thesis is concerned with the compression of still images using fixed and adaptive wavelet transforms. The wavelet transform is a suitable candidate for representing an image in a compression system, due to its being an efficient representation, having an inherent multiresolution nature, and possessing a self-similar structure which lends itself t

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14

Whitehouse, Steven John. "Error resilient image compression." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621935.

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15

Penrose, Andrew John. "Extending lossless image compression." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/272288.

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16

Shaban, Osama M. N. "Image compression using local image visual activities." Thesis, De Montfort University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391590.

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17

Hague, Darren S. "Neural networks for image data compression : improving image quality for auto-associative feed-forward image compression networks." Thesis, Brunel University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262478.

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18

Wyllie, Michael. "A comparative quantitative approach to digital image compression." Huntington, WV : [Marshall University Libraries], 2006. http://www.marshall.edu/etd/descript.asp?ref=719.

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19

Lee, Jungwon. "Efficient image compression system using a CMOS transform imager." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31825.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Anderson, David; Committee Member: Dorsey, John; Committee Member: Hasler, Paul; Committee Member: Kang, Sung Ha; Committee Member: Romberg, Justin. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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20

Tummala, Sai Virali, and Veerendra Marni. "Comparison of Image Compression and Enhancement Techniques for Image Quality in Medical Images." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15360.

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21

Moreno, Escobar Jesús Jaime. "Perceptual Criteria on Image Compression." Doctoral thesis, Universitat Autònoma de Barcelona, 2011. http://hdl.handle.net/10803/51428.

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Abstract (sommario):

Hoy en día las imágenes digitales son usadas en muchas areas de nuestra vida cotidiana, pero estas tienden a ser cada vez más grandes. Este incremento de información nos lleva al problema del almacenamiento de las mismas. Por ejemplo, es común que la representación de un pixel a color ocupe 24 bits, donde los canales rojo, verde y azul se almacenen en 8 bits. Por lo que, este tipo de pixeles en color pueden representar uno de los 224 ¼ 16:78 millones de colores. Así, una imagen de 512 £ 512 que representa con 24 bits un pixel ocupa 786,432 bytes. Es por ello que la compresión es importante. U

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22

Zhang, Kui. "Knowledge based image sequence compression." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/843195/.

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In this thesis, most commonly encountered video compression techniques and international coding standards are studied. The study leads to the idea of a reconfigurable codec which can adapt itself to the specific requirements of diverse applications so as to achieve improved performance. Firstly, we propose a multiple layer affine motion compensated codec which acts as a basic building block of the reconfigurable multiple tool video codec. A detailed investigation of the properties of the proposed codec is carried out. The experimental results reveal that the gain in coding efficiency from impr

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23

Lin, Huawu. "Fractal image compression using pyramids." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27682.pdf.

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24

Gandhi, Sonia. "ENO interpolation for image compression." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/cr/colorado/fullcit?p1425778.

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25

Gorley, Paul Ward. "Metrics for stereoscopic image compression." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/3471/.

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Metrics for automatically predicting the compression settings for stereoscopic images, to minimize file size, while still maintaining an acceptable level of image quality are investigated. This research evaluates whether symmetric or asymmetric compression produces a better quality of stereoscopic image. Initially, how Peak Signal to Noise Ratio (PSNR) measures the quality of varyingly compressed stereoscopic image pairs was investigated. Two trials with human subjects, following the ITU-R BT.500-11 Double Stimulus Continuous Quality Scale (DSCQS) were undertaken to measure the quality of symm

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26

Byrne, James. "Texture synthesis for image compression." Thesis, University of Bristol, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574259.

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Still image compression methods have changed little over the last ten years. Mean- while, the quantity of content transmitted over limited bandwidth channels has increased dramatically. The currently available methods are content agnostic: that I is they use the same compression process independent of the content at any given spatial location. Region specific coding provides one possible route to increased compression performance. Texture regions in particular are usually not conceptually important to a viewer of an image, but the high frequency nature of such regions consumes many bits when e

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27

Sahandi, M. R. "Image compression using vector encoding." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379796.

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28

Karki, Maya, H. N. Shivashankar, and R. K. Rajangam. "IMAGE DATA COMPRESSION (USING DPCM)." International Foundation for Telemetering, 1991. http://hdl.handle.net/10150/612163.

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International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Advances in computer technology and mass storage have paved the way for implementing advanced data compression techniques to improve the efficiency of transmission and storage of images. The present paper deals on the development of a data compression algorithm suitable for images received from satellites. The compression ratio of 1.91:1 is achieved with the proposed technique. The technique used is 1-D DPCM Coding. Hardware-relevant to coder has also been propos

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29

Iyer, Lakshmi Ramachandran. "Image Compression Using Balanced Multiwavelets." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33748.

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The success of any transform coding technique depends on how well the basis functions represent the signal features. The discrete wavelet transform (DWT) performs a multiresolution analysis of a signal; this enables an efficient representation of smooth and detailed signal regions. Furthermore, computationally efficient algorithms exist for computing the DWT. For these reasons, recent image compression standards such as JPEG2000 use the wavelet transform. It is well known that orthogonality and symmetry are desirable transform properties in image compression applications. It is also known tha

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30

Mellin, Fredrik. "Introduction to Fractal Image Compression." Thesis, Uppsala universitet, Analys och sannolikhetsteori, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444400.

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31

Hong, Edwin S. "Group testing for image compression /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/6900.

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32

Xiao, Panrong. "Image compression by wavelet transform." [Johnson City, Tenn. : East Tennessee State University], 2001. http://etd-submit.etsu.edu/etd/theses/available/etd-0711101-121206/unrestricted/xiaop0720.pdf.

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33

Oh, Han. "Perceptual Image Compression using JPEG2000." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202996.

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Image sizes have increased exponentially in recent years. The resulting high-resolution images are typically encoded in a lossy fashion to achieve high compression ratios. Lossy compression can be categorized into visually lossless and visually lossy compression depending on the visibility of compression artifacts. This dissertation proposes visually lossless coding methods as well as a visually lossy coding method with perceptual quality control. All resulting codestreams are JPEG2000 Part-I compliant.Visually lossless coding is increasingly considered as an alternative to numerically lossles

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34

Wakefield, Paul D. "Aspects of fractal image compression." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285300.

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35

Dumas, Thierry. "Deep learning for image compression." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S029/document.

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Ces vingt dernières années, la quantité d’images et de vidéos transmises a augmenté significativement, ce qui est principalement lié à l’essor de Facebook et Netflix. Même si les capacités de transmission s’améliorent, ce nombre croissant d’images et de vidéos transmises exige des méthodes de compression plus efficaces. Cette thèse a pour but d’améliorer par l’apprentissage deux composants clés des standards modernes de compression d’image, à savoir la transformée et la prédiction intra. Plus précisément, des réseaux de neurones profonds sont employés car ils ont un grand pouvoir d’approximati

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36

Nolte, Ernst Hendrik. "Image compression quality measurement : a comparison of the performance of JPEG and fractal compression on satellite images." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51796.

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Thesis (MEng)--Stellenbosch University, 2000.<br>ENGLISH ABSTRACT: The purpose of this thesis is to investigate the nature of digital image compression and the calculation of the quality of the compressed images. The work is focused on greyscale images in the domain of satellite images and aerial photographs. Two compression techniques are studied in detail namely the JPEG and fractal compression methods. Implementations of both these techniques are then applied to a set of test images. The rest of this thesis is dedicated to investigating the measurement of the loss of quality that was

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37

Almshaal, Rashwan M. "Sparse Signal Processing Based Image Compression and Inpainting." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4286.

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In this thesis, we investigate the application of compressive sensing and sparse signal processing techniques to image compression and inpainting problems. Considering that many signals are sparse in certain transformation domain, a natural question to ask is: can an image be represented by as few coefficients as possible? In this thesis, we propose a new model for image compression/decompression based on sparse representation. We suggest constructing an overcomplete dictionary by combining two compression matrices, the discrete cosine transform (DCT) matrix and Hadamard-Walsh transform (HWT)

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38

Nelson, Christopher. "Contour encoded compression and transmission /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1613.pdf.

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39

Roman-Gonzalez, Avid. "Compression Based Analysis of Image Artifacts: Application to Satellite Images." Phd thesis, Telecom ParisTech, 2013. http://tel.archives-ouvertes.fr/tel-00935029.

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This thesis aims at an automatic detection of artifacts in optical satellite images such as aliasing, A/D conversion problems, striping, and compression noise; in fact, all blemishes that are unusual in an undistorted image. Artifact detection in Earth observation images becomes increasingly difficult when the resolution of the image improves. For images of low, medium or high resolution, the artifact signatures are sufficiently different from the useful signal, thus allowing their characterization as distortions; however, when the resolution improves, the artifacts have, in terms of signal th

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40

Taylor, Ty. "Compression of Cartoon Images." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1301319148.

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41

Tokdemir, Serpil. "Digital compression on GPU." unrestricted, 2006. http://etd.gsu.edu/theses/available/etd-12012006-154433/.

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Thesis (M.S.)--Georgia State University, 2006.<br>Title from dissertation title page. Saeid Belkasim, committee chair; Ying Zhu, A.P. Preethy, committee members. Electronic text (90 p. : ill. (some col.)). Description based on contents viewed May 2, 2007. Includes bibliographical references (p. 78-81).

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42

Henriques, Marco António Silva. "Facial recognition based on image compression." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17207.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>O reconhecimento facial tem recebido uma importante atenção em termos de investigação, especialmente nos últimos anos, podendo ser considerado como uma das mais bem sucessidas aplicações de análise e "compreensão" de imagens. Prova disso são as várias conferências e novos artigos que são publicados sobre o tema. O foco na investigação deve-se à grande quantidade de aplicações a que pode estar associado, podendo servir de "auxílio" para muitas tarefas diárias do ser humano. Apesar de existirem diversos algoritmos para efetuar recon

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43

Williams, Saunya Michelle. "Effects of image compression on data interpretation for telepathology." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42762.

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When geographical distance poses as a barrier, telepathology is designed to offer pathologists the opportunity to replicate their normal activities by using an alternative means of practice. The rapid progression in technology has greatly influenced the appeal of telepathology and its use in multiple domains. To that point, telepathology systems help to afford teleconsultation services for remote locations, improve the workload distribution in clinical environments, measure quality assurance, and also enhance educational programs. While telepathology is an attractive method to many potential

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44

Kucherov, Dmytro, D. P. Kucherov, and Д. П. Кучеров. "A computer system for images compression." Thesis, Національний авіаційний університет, 2019. http://er.nau.edu.ua/handle/NAU/38657.

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A new approach to images compression is proposed. The approach involves the use of elements of tensor analysis based on singular decomposition. A feature of this approach used is the representation of the image by the matrix triad, which includes the tensor core and a pair of unitary matrices containing right and left singular vectors, respectively. Compression is achieved by one recurrent procedure, which involves lowering the rank of the triad to the level of allowable errors while maintaining the original image size. The result of semi-natural modeling the system components is provided.<br>

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45

Lim, Seng. "Image compression scheme for network transmission." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA294959.

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Bodine, Christopher J. "Psychophysical comparisons in image compression algorithms." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA362726.

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Thesis (M.S. in Operations Research) Naval Postgraduate School, March 1999.<br>Thesis advisor(s): William K. Krebs, Lyn R. Whitaker. "March 1999". Includes bibliographical references (p. 97-99). Also available online.

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47

Ritter, Jörg. "Wavelet based image compression using FPGAs." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967407710.

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48

Butt, Amar Majeed, and Rana Asif Sattar. "On Image Compression using Curve Fitting." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3144.

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Context: Uncompressed Images contain redundancy of image data which can be reduced by image compression in order to store or transmit image data in an economic way. There are many techniques being used for this purpose but the rapid growth in digital media requires more research to make more efficient use of resources. Objectives: In this study we implement Polynomial curve fitting using 1st and 2nd curve orders with non-overlapping 4x4 and 8x8 block sizes. We investigate a selective quantization where each parameter is assigned a priority. The 1st parameter is assigned high priority compared

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49

Ferdeen, Mats. "Reducing Energy Consumption Through Image Compression." Thesis, Linköpings universitet, Datorteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-134335.

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The energy consumption to make the off-chip memory writing and readings are aknown problem. In the image processing field structure from motion simpler compressiontechniques could be used to save energy. A balance between the detected features suchas corners, edges, etc., and the degree of compression becomes a big issue to investigate.In this thesis a deeper study of this balance are performed. A number of more advancedcompression algorithms for processing of still images such as JPEG is used for comparisonwith a selected number of simpler compression algorithms. The simpler algorithms canbe

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50

Quesnel, Ronny. "Image compression using subjective vector quantization." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60714.

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The goal of this research is to improve the subjective quality of real world imagery encoded with spatial vector quantization (VQ). Improved subjective quality implies that a human perceives less visually objectionable distortion when looking at the coded images. Through study of several basic VQ schemes, the issues fundamental to achieving good subjective quality are uncovered and addressed in this work. Vector quantization is very good at reproducing quasi-uniform textures in an image, but has difficulty in reproducing abrupt changes in textures (edges) and fine detail and can cause a block

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