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1
Wang, Wenyi. "Hiding Depth Map in JPEG Image and MPEG-2 Video." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20360.
Full textAbstract:
Digital watermarking of multimedia content has been proposed as a method for different
applications such as copyright protection, content authentication, transaction
tracking and data hiding.
In this thesis, we propose a lossless watermarking approach based on Discrete Cosine
Transform (DCT) for a new application of watermarking. A depth map obtained from
a stereoscopic image pair is embedded into one of the two images using a reversible
watermarking algorithm. Different from existing approaches which hide depth map
in spatial domain, the depth information is hidden in the quantized DCT domain of
the stereo image in our method. This modification makes the watermarking algorithm
compatible with JPEG and MPEG-2 compression.
After the investigation of the quantized DCT coefficients distribution of the compressed
image and video, The bit-shift operation is utilized to embed the depth map into its associated 2D image reversibly for the purpose of achieving high compression efficiency of the watermarked image and/or video and high visual quality of stereo image and/or video after the depth map is extracted.
We implement the proposed method to analyze its performance. The experimental results show that a very high payload of watermark (e.g. depth map) can be embedded into the JPEG compressed image and MPEG-2 video. The compression efficiency is only slightly reduced after the watermark embedding and the quality of the original image or video can be restored completely at the decoder side.
2
Lipinskas, Saulius. "Vienlusčių sistemų programų specializavimo metodų tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20090304_094817-80068.
Full textAbstract:
Technologijos greitai keičiasi, kasdien atsiranda mokslo ir technikos naujovių, kurios daugiau ar mažiau įtakoja mūsų kasdieninį gyvenimą. Skaitmeninės technologijos atnešė daug naujovių ir galima numanyti, kad jų bus dar daugiau. Skaitmenizavimo procesas tęsiasi ir apima dar likusias analogines erdves. Ypatingai šis procesas svarbus komunikacijų srityje Darbe stengtasi išsiaiškinti ir ištirti DVI veikimo principus bei suprojektuoti šios sąsajos modifikaciją, besiremiančia suspaustų vaizdų perdavimo technologija. Darbe susiduriama su vaizdo duomenų formavimo, perdavimo ir atvaizdavimo mechanizmais. Tuo pat panagrinėjant įvairius nestandartinius šio mechanizmo atvejus, kurie galbūt dabar nėra komerciškai efektyvūs, bet galėtų rasti labai specifinį panaudojimą ir būtent jame taptų nepakeičiamai naudingi. Nuspręsta imtis skaitmeninės DVI sąsajos (angl. digital visual interface). Atliekamų funkcijų atskyrimui naudojama blokinė dekompozicija, apžvelgiamos aparatūrinės ir programinės užsibrėžtos sistemos kūrimo priemonės. Kadangi DVI sąsaja jungiamas kompiuteris ir skaitmeninis monitorius paprastai yra vienas nuo kito netoli, nuspręsta pabandyti kaip pavyktų šį atstumą pailginti neapibrėžtai daug, kitaip tariant vaizdą perduoti naudojant įprastą ethernet tipo laidą, duomenų formatą pakeičiant į paketinį - IP (interneto protokolą) bei su kokiomis pagrindinėmis problemomis susiduriama tai darant. Darbe nagrinėjama ir iškeltos funkcijos ar jos dalies perkėlimo į lustą galimybė.<br>The study tries to clear out how does the digital video data transfer system works. The scope is about DVI interface and similar systems. Also the design of compressed video data transfer mechanisms. The things touched are very different and not even very popular in deed but in some cases they can become a very useful decision for some non standard applications. The study mainly touches digital visual interface – DVI. In case that DVI interface connected computer and monitor must be really near each other it was decided to enlong this distance. In other words – to transfer video data through Ethernet cable and changing and compressing DVI video data format into packets. All study stands for it and tries to clarify the main problems and difficulties doing that.
3
Rieger, James L., and Sherri L. Gattis. "A Comparison of Various Video Compression Methods for Use in Instrumentation Systems." International Foundation for Telemetering, 1993. http://hdl.handle.net/10150/608873.
Full textAbstract:
International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Various forms of 'lossy' and 'lossless' encoding have been
implemented or proposed to allow compression of still and motion picture
images, with varying degrees of success which in turn depend on how
success is defined. Proponents of various systems claim 'compression
ratios' which by their nature defy comparison of one system with another
and suggest there actually may be something like a free lunch. This paper
compares various compression methods as well as the implications
involved in using them and what happens when different systems
encounter the problems associated with the uses of the restored picture.
4
Thom, Gary A., and Alan R. Deutermann. "A COMPARISON OF VIDEO COMPRESSION ALGORITHMS." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/608290.
Full textAbstract:
International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>Compressed video is necessary for a variety of telemetry requirements. A large number of competing video compression algorithms exist. This paper compares the ability of these algorithms to meet criteria which are of interest for telemetry applications. Included are: quality, compression, noise susceptibility, motion performance and latency. The algorithms are divided into those which employ inter-frame compression and those which employ intra-frame compression. A video tape presentation will also be presented to illustrate the performance of the video compression algorithms.
5
Grecos, Christos. "Low cost algorithms for image/video coding and rate control." Thesis, University of South Wales, 2001. https://pure.southwales.ac.uk/en/studentthesis/low-cost-algorithms-for-imagevideo-coding-and-rate-control(40ae7449-3372-4f21-aaec-91ad339907e9).html.
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6
Zeybek, Emre. "Compression multimodale du signal et de l’image en utilisant un seul codeur." Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1060/document.
Full textAbstract:
Cette thèse a pour objectif d'étudier et d'analyser une nouvelle stratégie de compression, dont le principe consiste à compresser conjointement des données issues de plusieurs modalités, en utilisant un codeur unique. Cette approche est appelée « Compression Multimodale ». Dans ce contexte, une image et un signal audio peuvent être compressés conjointement et uniquement par un codeur d'image (e.g. un standard), sans la nécessité d'intégrer un codec audio. L'idée de base développée dans cette thèse consiste à insérer les échantillons d'un signal en remplacement de certains pixels de l'image « porteuse » tout en préservant la qualité de l'information après le processus de codage et de décodage. Cette technique ne doit pas être confondue aux techniques de tatouage ou de stéganographie puisqu'il ne s'agit pas de dissimuler une information dans une autre. En Compression Multimodale, l'objectif majeur est, d'une part, l'amélioration des performances de la compression en termes de débit-distorsion et d'autre part, l'optimisation de l'utilisation des ressources matérielles d'un système embarqué donné (e.g. accélération du temps d'encodage/décodage). Tout au long de ce rapport, nous allons étudier et analyser des variantes de la Compression Multimodale dont le noyau consiste à élaborer des fonctions de mélange et de séparation, en amont du codage et de séparation. Une validation est effectuée sur des images et des signaux usuels ainsi que sur des données spécifiques telles que les images et signaux biomédicaux. Ce travail sera conclu par une extension vers la vidéo de la stratégie de la Compression Multimodale<br>The objective of this thesis is to study and analyze a new compression strategy, whose principle is to compress the data together from multiple modalities by using a single encoder. This approach is called “Multimodal Compression” during which, an image and an audio signal is compressed together by a single image encoder (e.g. a standard), without the need for an integrating audio codec. The basic idea developed in this thesis is to insert samples of a signal by replacing some pixels of the "carrier's image” while preserving the quality of information after the process of encoding and decoding. This technique should not be confused with techniques like watermarking or stéganographie, since Multimodal Compression does not conceal any information with another. Two main objectives of Multimodal Compression are to improve the compression performance in terms of rate-distortion and to optimize the use of material resources of a given embedded system (e.g. acceleration of encoding/decoding time). In this report we study and analyze the variations of Multimodal Compression whose core function is to develop mixing and separation prior to coding and separation. Images and common signals as well as specific data such as biomedical images and signals are validated. This work is concluded by discussing the video of the strategy of Multimodal Compression
7
Akdag, Sadik Bahaettin. "An Image Encryption Algorithm Robust To Post-encryption Bitrate Conversion." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607710/index.pdf.
Full textAbstract:
In this study, a new method is proposed to protect JPEG still images through encryption by employing integer-to-integer transforms and frequency domain scrambling in DCT channels. Different from existing methods in the literature, the encrypted image can be further compressed, i.e. transcoded, after the encryption. The method provides selective encryption/security level with the adjustment of its parameters. The encryption method is tested with various
images and compared with the methods in the literature in terms of scrambling performance, bandwidth expansion, key size and security. Furthermore this method is applied to the H.263 video sequences for the encryption of I-frames.
8
Zilic, Edmin. "Implementering av 1D-DCT." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7785.
Full textAbstract:
<p>IDCT (Inverse Discrete Cosine Transform) is a common algorithm being used with image and sound decompression. The algorithm is a Fourier related transform which can occur in many different types like, one-dimensional, two-dimensional, three-dimensional and many more.</p><p>The goal with this thesis is to create a fast and low effect version of two-dimensional IDCT algorithm, where techniques as multiple-constant multiplication and subexpression sharing plus bit-serial and bit-parallel arithmetic are used.</p><p>The result is a hardware implementation with power consumption at 19,56 mW.</p>
9
Yang, Hsueh-szu, and Benjamin Kupferschmidt. "Time Stamp Synchronization in Video Systems." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605988.
Full textAbstract:
ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>Synchronized video is crucial for data acquisition and telecommunication applications. For real-time applications, out-of-sync video may cause jitter, choppiness and latency. For data analysis, it is important to synchronize multiple video channels and data that are acquired from PCM, MIL-STD-1553 and other sources. Nowadays, video codecs can be easily obtained to play most types of video. However, a great deal of effort is still required to develop the synchronization methods that are used in a data acquisition system. This paper will describe several methods that TTC has adopted in our system to improve the synchronization of multiple data sources.
10
Kimiaei, Asadi Mariam. "Adaptation de Contenu Multimédia avec MPEG-21: Conversion de Ressources et Adaptation Sémantique de Scènes." Phd thesis, Télécom ParisTech, 2005. http://pastel.archives-ouvertes.fr/pastel-00001615.
Full textAbstract:
L'objectif de la thèse de doctorat présentée dans ce mémoire est de proposer des techniques et des méthodologies nouvelles, simples et efficaces pour l'adaptation de contenu multimédia à diverses contraintes de contexte d'utilisation. Le travail est basé sur des parties de la norme MPEG-21 en cours de définition, qui vise à définir les différents composants d'un système de distribution de contenus multimédia. Le travail de cette thèse est divisé en deux parties principales: l'adaptation de médias uniques, et l'adaptation sémantique de documents multimédia composés. Dans l'adaptation de médias uniques, le média est adapté aux contraintes du contexte de consommation, telles que les capacités du terminal, les préférences de l'utilisateur, les capacités du réseau, les recommandations de l'auteur, etc... Dans cette forme d'adaptation, le média est considéré hors de tout contexte de présentation multimédia structurée, ou indépendamment de la composition multimédia (scène) dans laquelle il est utilisé. Nous avons défini des outils et descripteurs, étendant les outils et descripteurs MPEG-21 DIA, pour la description des suggestions d'adaptation de médias (également appelée Conversion de Ressource), et la description des paramètres correspondants. Nous avons réalisé un moteur d'adaptation de médias qui fonctionne selon ces suggestions ainsi que selon les contraintes du contexte, et qui applique au media, la forme la plus appropriée d'adaptation avec des valeurs optimales des paramètres d'adaptation, afin d'obtenir la meilleure qualité d'utilisation. Durant cette partie du travail, nous avons apporté plusieurs contributions à la norme MPEG-21 DIA. Dans l'adaptation sémantique de documents multimédia structurés, nous avons considéré l'adaptation selon les relations temporelles, spatiales et sémantiques entre les objets média de la scène. En adaptant une présentation multimédia afin de préserver l'uniformité et la logique de la scène adaptée, le processus d'adaptation doit avoir accès à l'information sémantique de la présentation. Nous avons défini un langage d'extension de la description de scène pour l'expression de cette information sémantique, à base de descripteurs. Ces descripteurs contiennent des informations fournies par l'auteur de la scène multimédia, ou par n'importe quelle autre entité dans la chaîne de livraison multimédia. L'information incluse dans ces descripteurs aide le moteur d'adaptation à décider de la forme et de la nature optimales des adaptations qui doivent être appliquées au document. Cette information consiste en une information sémantique indépendante de chaque objet média, les dépendances sémantiques entre les objets média de la scène et les préférences sémantiques sur la fragmentation de scène. Pour la réalisation d'un tel système d'adaptation, nous avons utilisé SMIL 2.0 pour décrire nos scènes multimédia. Cependant, la méthodologie est indépendante de ce choix et peut être appliquée à d'autres types de documents multimédia, tels que MPEG-4 XMT. Nous avons implémenté un moteur d'adaptation sémantique expérimental, qui manipule et adapte des documents SMIL, en utilisant les informations sémantiques et physiques du contenu, ainsi que des contraintes de contexte.
11
Kimiaei, Asadi Mariam. "Adaptation de contenu multimedia avec MPEG 21 : conversion de ressources et adaptation sémantique de scènes." Paris, ENST, 2005. http://www.theses.fr/2005ENST0040.
Full textAbstract:
L'objectif de cette thèse de doctorat est de proposer des techniques et des méthodologies nouvelles, simples et efficaces pour l'adaptation de contenu multimédia à diverses contraintes de contexte d’utilisation. Le travail est basé sur la norme MPEG-21 qui vise à définir les différents composants d'un système de distribution de contenus multimédia. Le travail de cette thèse est divisé en deux parties principales : l'adaptation de médias uniques, et l'adaptation sémantique de documents multimédia composé. Dans l'adaptation de médias uniques, le média est adapté aux contraintes du contexte de consommation, telles que les capacités du terminal, les préférences de l'utilisateur, les capacités du réseau, les recommandations de l'auteur, etc. . . Dans cette forme d'adaptation, le média est considéré hors de tout contexte de présentation multimédia structurée. Nous avons défini des outils et descripteurs, étendant les outils et descripteurs MPEG-21 DIA, pour la description des suggestions d’adaptation et la description des paramètres correspondants. Dans l'adaptation sémantique de documents multimédia structurés, adaptation est considérée selon les relations temporelles, spatiales et sémantiques entre les objets média de la scène. En adaptant une présentation multimédia afin de préserver l'uniformité et la logique de la scène adaptée, le processus d'adaptation doit avoir accès à l'information sémantique de la présentation. Nous avons défini un langage d’extension de la description de scène pour l'expression de cette information sémantique. Pour la réalisation d’un tel système d’adaptation, nous avons utilisé SMIL 2. 0 pour décrire nos scènes multimédia<br>The objective of this Ph. D. Thesis is to propose new, simple and efficient techniques and methodologies for support of multimedia content adaptation to constrained contexts. The work is based on parts of the on-going MPEG-21 standard that aims at defining different components of a multimedia distribution framework. The thesis is divided into two main parts: single media adaptation and semantic adaptation of multimedia composed documents. In single media adaptation, the media is adapted to the context constraints, such as terminal capabilities, user preferences, network capacities, author recommendations and etc. In this type of adaptation, the media is considered solely, i. E. As mono media. We have defined description tools extending the MPEG-21 DIA schema, for description of hints and suggestions on different media adaptations and their corresponding parameters. In semantic adaptation of structured multimedia documents, we addressed the question of adaptation based on temporal, spatial and semantic relationships between the media objects. When adapting a multimedia presentation, in order to preserve the consistency and meaningfulness of the adapted scene, the adaptation process needs to have access to the semantic information of the presentation. We have defined a language as a set of descriptors, for the expression of semantic information of composed multimedia content. In our implementations, we used SMIL 2. 0 for describing multimedia scenes
12
Kimiaei, Asadi Mariam. "Adaptation de contenu multimédia avec MPEG 21 : conversion de ressources et adaptation sémantique de scènes /." Paris : École nationale supérieure des télécommunications, 2006. http://catalogue.bnf.fr/ark:/12148/cb40129226g.
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COUTINHO, Vítor de Andrade. "Aproximações para DCT via pruning com aplicações em codificação de imagem e vídeo." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17136.
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Previous issue date: 2015-02-23<br>CNPq<br>O presente trabalho aborda o desenvolvimento de aproximações para a transformada dis-
reta do
osseno (DCT) utilizando a abordagem pruning. Devido à propriedade da
ompa
ta-
ção de energia, a DCT é empregada em diversas apli
ações de
ompressão de dados. Embora
algoritmos rápidos permitam
omputar a DCT e
ientemente, operações de multipli
ação são
inevitáveis. Devido a
res
ente demanda por métodos de baixo
onsumo energéti
o, novos
algoritmos de
usto
omputa
ional reduzido são ne
essários. Neste
ontexto, aproximações
para a DCT foram propostas nos últimos anos. Tais aproximações permitem algoritmos livres
de multipli
ação, sem a ne
essidade de operações de ponto utuante, mantendo o desempe-
nho de
ompressão
omparável ao forne
ido por métodos baseados na DCT. Uma abordagem
adi
ional para reduzir o
usto
omputa
ional da DCT é a utilização de pruning. Tal té
ni
a
onsiste em não
onsiderar
oe
ientes dos vetores de entrada e/ou saída que apresentam
menor relevân
ia em termos de energia
on
entrada. No
aso da DCT, esses
oe
ientes são
os termos de mais alta frequên
ia do vetor transformado. A apli
ação de pruning a aproxima-
ções para a DCT é uma área pou
o explorada. O objetivo deste trabalho é apli
ar a té
ni
a a
diferentes métodos aproximados para a DCT. As transformações resultantes foram apli
adas
no
ontexto de
ompressão de imagem e vídeo e os resultados mostraram desempenho
ompa-
rável ao de métodos exatos a um
usto
omputa
ional bastante reduzido. Uma generalização
do
on
eito é apresentada, assim
omo uma análise da
omplexidade aritméti
a.<br>This work introdu
es approximate dis
rete
osine transforms (DCT) based on the pruning
approa
h. Due to the energy
ompa
tion property, the DCT is employed in several data
ompression appli
ations. Although fast algorithms allow an e
ient DCT
omputation,
multipli
ation operations are inevitable. Due to the in
reasing demand for energy e
ient
methods, new algorithms with redu
ed
omputational
ost are required. In this
ontext,
DCT approximations have been proposed re
ently. Su
h approximations allow multipli
ation
free algorithms whi
h
an avoid oating point operations, while maintaining a
ompetitive
performan
e. A further approa
h to redu
e the
omputational
ost of the DCT is pruning. The
te
hnique
onsists of dis
arding input and/or output ve
tors
oe
ients whi
h are regarded
as less signi
ant. In the
ase of the DCT, su
h
oe
ients are output
oe
ients asso
iated
to higher frequen
y terms. Pruned DCT approximations is a relatively unexplored eld of
resear
h. The obje
tive of this work is the
ombination of approximations and pruning to
derive extremely low-
omplexity DCT approximations. The resulting methods were applied in
the image and vídeo
ompression s
enario and results showed
omparative performan
e with
exa
t methods at a mu
h lower
omputational
omplexity. A qualitative and quantitative
omparison with a
omprehensive list of existing methods is presented. A generalization of
the pruning
on
ept is presented.
14
Yilmaz, Fatih Levent. "Video Encryption." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-12604.
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Video Encryption is nearly the best method for blocking unwanted seizures and viewing of any transmitted video or information. There are several useful techniques that are available for encryping videos. However, one of the unique speciality for human eye is spotting the irregularity in videos due to weak video decoding or weak choice of video encryption hardware. Because of this situation, it is very important to select the right hardware or else our video transmissions may not be secured or our decoded video may be un-watchable. Every technique has advantages and disadvantages over other technical methods. Line-cut and rotate video encryption method is maybe the best way of acquiring safe, secured and good quality encypted videos. In this method, every line in the video frame cuts and rotates from different points and these cut points are created from a random matrix. The advantage of this method is to supply a coherent video signal, gives an excellent amount of darkness, as well as good decode quality and stableness. On the other hand it’s disadvantages is to have complex timing control and needs specialized encryption equipment.
15
Bhardwaj, Divya Anshu. "Inverse Discrete Cosine Transform by Bit Parallel Implementation and Power Comparision." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2447.
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<p>The goal of this project was to implement and compare Invere Discrete Cosine Transform using three methods i.e. by bit parallel, digit serial and bit serial. This application describes a one dimensional Discrete Cosine Transform by bit prallel method and has been implemented by 0.35 ìm technology. When implementing a design, there are several considerations like word length etc. were taken into account. The code was implemented using WHDL and some of the calculations were done in MATLAB. The VHDL code was the synthesized using Design Analyzer of Synopsis; power was calculated and the results were compared.</p>
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Eklund, Anders. "Image coding with H.264 I-frames." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8920.
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<p>In this thesis work a part of the video coding standard H.264 has been implemented. The part of the video coder that is used to code the I-frames has been implemented to see how well suited it is for regular image coding. The big difference versus other image coding standards, such as JPEG and JPEG2000, is that this video coder uses both a predictor and a transform to compress the I-frames, while JPEG and JPEG2000 only use a transform. Since the prediction error is sent instead of the actual pixel values, a lot of the values are zero or close to zero before the transformation and quantization. The method is much like a video encoder but the difference is that blocks of an image are predicted instead of frames in a video sequence.</p><br><p>I det här examensarbetet har en del av videokodningsstandarden H.264 implementerats. Den del av videokodaren som används för att koda s.k. I-bilder har implementerats för att testa hur bra den fungerar för ren stillbildskodning. Den stora skillnaden mot andra stillbildskodningsmetoder, såsom JPEG och JPEG2000, är att denna videokodaren använder både en prediktor och en transform för att komprimera stillbilderna, till skillnad från JPEG och JPEG2000 som bara använder en transform. Eftersom prediktionsfelen skickas istället för själva pixelvärdena så är många värden lika med noll eller nära noll redan innan transformationen och kvantiseringen. Metoden liknar alltså till mycket en ren videokodare, med skillnaden att man predikterar block i en bild istället för bilder i en videosekvens.</p>
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Zeybek, Emre. "Compression multimodale du signal et de l'image en utilisant un seul codeur." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00665757.
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Cette thèse a pour objectif d'étudier et d'analyser une nouvelle stratégie de compression, dont le principe consiste à compresser conjointement des données issues de plusieurs modalités, en utilisant un codeur unique. Cette approche est appelée " Compression Multimodale ". Dans ce contexte, une image et un signal audio peuvent être compressés conjointement et uniquement par un codeur d'image (e.g. un standard), sans la nécessité d'intégrer un codec audio. L'idée de base développée dans cette thèse consiste à insérer les échantillons d'un signal en remplacement de certains pixels de l'image " porteuse " tout en préservant la qualité de l'information après le processus de codage et de décodage. Cette technique ne doit pas être confondue aux techniques de tatouage ou de stéganographie puisqu'il ne s'agit pas de dissimuler une information dans une autre. En Compression Multimodale, l'objectif majeur est, d'une part, l'amélioration des performances de la compression en termes de débit-distorsion et d'autre part, l'optimisation de l'utilisation des ressources matérielles d'un système embarqué donné (e.g. accélération du temps d'encodage/décodage). Tout au long de ce rapport, nous allons étudier et analyser des variantes de la Compression Multimodale dont le noyau consiste à élaborer des fonctions de mélange et de séparation, en amont du codage et de séparation. Une validation est effectuée sur des images et des signaux usuels ainsi que sur des données spécifiques telles que les images et signaux biomédicaux. Ce travail sera conclu par une extension vers la vidéo de la stratégie de la Compression Multimodale
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Šiška, Michal. "Ztrátová komprese pohyblivých obrazů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219298.
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This thesis deals with description of lossy video compression. Theoretical part of the work describes the fundamentals of the video compression and standarts for lossy as well lossless video and still image compression. The practical part follows up with design of Java program for simulation of MPEG codec.
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Špaňhel, Petr. "Automobilová on-board kamera se záznamem telemetrie." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236541.
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This master thesis deals with the design devices for automobile driving record with the information on telemetry. Camera placed in the vehicle captures the traffic before the accident, can facilitate the decisions about the offender. The basic element of the camera is DaVinci development kit has been developed for digital video applications. The aim of this thesis is to find ways to effectively implement basic algorithms for processing and evaluation of the scanned image using a single-chip microprocessor.
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Huang, Xiu Juan, and 黃秀娟. "Transform domain JPEG to MPEG-1 format converter." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/47222997971188866751.
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Lian, Chung-Jr, and 連崇志. "Design and Implementation of Image Coding Systems: JPEG, JPEG 2000 and MPEG-4 VTC." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/77902516298772727288.
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博士<br>國立臺灣大學<br>電機工程學研究所<br>91<br>In this dissertation, the hardware architecture design and implementation of image coding systems
are presented. The research focuses on three image coding standards: JPEG, JPEG2000, and MPEG-4
Visual Texture Coding (VTC).
JPEG is a well-known and matured standard. It has been widely used for natural image compression,
especially very popular for digital still camera applications. In the first part of this
dissertation, we proposed fully pipelined JPEG encoder and decoder for high speed image
processing requirements in post-PC electronic appliances. The processing power is 50 million
samples per second at 50 MHz working frequency. The proposed architectures can handle
million-pixel digital images'''''''' encoding and decoding in very high speed. Other feature is that
both the encoder and decoder are stand-alone and full-function solutions. They can encode or
decode the JPEG compliant file without any aids from extra processor.
JPEG2000 is the latest image coding standard. It is defined to be a more powerful standard after
JPEG. JPEG2000 provids better compression performance, especially at low bitrates. It also
provides various features, such as quality and resolution progressive, region of interest coding,
lossy and lossless coding in an unified framework, etc. The performance of JPEG2000 comes at the
cost of higher computational complexity. In the second part of the dissertation, we discuss the
challenges and issues of the design of a JPEG2000 coding system. Cycle efficient block encoding
and decoding engines, and computation reduction techniques by Tier-2 feedback are proposed for
the most critical module, Embedded Block Coding with Optimized Truncation (EBCOT). With the
proposed parallel checking and skipping-based coding schemes, the scanning cycles can be reduced
to 40% of the direct bit-by-bit implementation. As for the Tier-2 feedback control in lossy
coding mode, the execution cycles and therefore power consumption can be lowered to 50% in the
case of about 10 times compression.
MPEG-4 Visual Texture Coding (VTC) tool is another compression algorithm that also adopts the
wavelet-based algorithm. In VTC, Zero-tree coding algorithm is adopted to generate the context
symbols for arithmetic coder. In the third part, the design of the zero-tree coding algorithm is
discussed. Tree-depth scan with multiple quantization mode are realized. Dedicated data access
scheme are designed for smooth coding flow.
In each chapter, detailed analysis of the algorithms are provided first. Then, efficient hardware
architectures are proposed exploiting special algorithm characteristics. The proposed dedicated
architectures can greatly improve the processing performance compared with a general
processor-based solution. For non-PC consumer applications, these architectures are more
competitive solutions for cost-efficient and high performance requirements.
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Selvaraj, V. "Rate Control Of MPEG-2 Video And JPEG images." Thesis, 1999. https://etd.iisc.ac.in/handle/2005/1639.
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Selvaraj, V. "Rate Control Of MPEG-2 Video And JPEG images." Thesis, 1999. http://etd.iisc.ernet.in/handle/2005/1639.
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Tsai, Yu-Chih, and 蔡育誌. "A Study on Color Image Decimation for MPEG-4 Dynamic Resolution Conversion." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/02025231367871316482.
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碩士<br>義守大學<br>資訊管理學系碩士班<br>92<br>High-speed digital data transmission services with mobile equipment are becoming available. Though the visual signal is one of the expected media to be used with such transmission capabilities, the bandwidth of visual signal is much broader than the provided transmission bandwidth in general. Therefore efficient video encoding algorithms have to be introduced. The ITU-T Recommendation H.263 and ISO/IEC MPEG-4 are very powerful encoding algorithms for a wide range of video sequences. But a large amount of bits are generated in highly active scenes to encode them using such conventional methods. This results in frame skipping and degradation of decoded picture quality. In order to keep these degradations as low as possible, MPEG-4 proposed a Dynamic Resolution Conversion (DRC) method of the prediction error. In the method, a reduced resolution encoding is carried out by using decimation when the input scene is highly active.
There are lots of methods of decimation and interpolation which often be applied to Image Resolution Conversion and Image Change of Scale, and the best method is Cubic-Spline Interpolation (CSI). In this thesis, we proposed a fast Cubic Spline (CSP) method based on the properties of color image space in common use to improve CSI scheme that is not easy to utilize the Block-based decimation method. Also CSP scheme adapts easily to more different color image space than CSI scheme does. Besides, we applied CSP to MPEG-4 DRC, and experiment results show that the proposed scheme can improve both coding efficiency and picture quality in MPEG-4 DRC.
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Chang, Chiung-Chao, and 張炯照. "THE DESIGN AND SIMULATION OF ATM TO MPEG-2 TRANSPORT STREAM CONVERSION CIRCUIT." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/85673945297959612754.
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Moiron, Sandro Rodrigo Ferreira. "Inter frame mode conversion for H.264/AVC to MPEG-2 video transcoder." Master's thesis, 2007. http://hdl.handle.net/10316/13935.
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"The effects of evaluation and rotation on descriptors and similarity measures for a single class of image objects." Thesis, 2008. http://hdl.handle.net/10210/564.
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“A picture is worth a thousand words”. If this proverb were taken literally we all know that every person interprets images or photos differently in terms of its content. This is due to the semantics contained in these images. Content-based image retrieval has become a vast area of research in order to successfully describe and retrieve images according to the content. In military applications, intelligence images such as those obtained by the defence intelligence group are taken (mostly on film), developed and then manually annotated thereafter. These photos are then stored in a filing system according to certain attributes such as the location, content etc. To retrieve these images at a later stage might take days or even weeks to locate. Thus, the need for a digital annotation system has arisen. The images of the military contain various military vehicles and buildings that need to be detected, described and stored in a database. For our research we want to look at the effects that the rotation and elevation angle of an object in an image has on the retrieval performance. We chose model cars in order to be able to control the environment the photos were taken in such as the background, lighting, distance between the objects, and the camera etc. There are also a wide variety of shapes and colours of these models to obtain and work with. We look at the MPEG-7 descriptor schemes that are recommended by the MPEG group for video and image retrieval as well as implement three of them. For the military it could be required that when the defence intelligence group is in the field, that the images be directly transmitted via satellite to the headquarters. We have therefore included the JPEG2000 standard which gives a compression performance increase of 20% over the original JPEG standard. It is also capable to transmit images wirelessly as well as securely. Including the MPEG-7 descriptors that we have implemented, we have also implemented the fuzzy histogram and colour correlogram descriptors. For our experimentation we implemented a series of experiments in order to determine the effects that rotation and elevation has on our model vehicle images. Observations are made when each vehicle is considered separately and when the vehicles are described and combined into a single database. After the experiments are done we look at the descriptors and determine which adjustments could be made in order to improve the retrieval performance thereof.<br>Dr. W.A. Clarke
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Augustine, Jacob. "Switching Theoretic Approach To Image Compression." Thesis, 1996. https://etd.iisc.ac.in/handle/2005/1898.
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Augustine, Jacob. "Switching Theoretic Approach To Image Compression." Thesis, 1996. http://etd.iisc.ernet.in/handle/2005/1898.
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