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Quantization effects on Compressed Sensing Video

Quantization effects on Compressed Sensing Video

引用

International Conference on Telecommunications (ICT)

作者： Yousuf Baig Edmund M-K. Lai J. P. Lewis School of Engineering and Advanced Technology Massey University Wellington New Zealand

Compressed Video Sensing (CVS) is the application of the theory and principles of Compressed Sensing to video coding. Previous research has largely ignored the effects of quantization on the random measurements. In this paper, we showed that Gaussian quantization of the CVS coefficients produce higher quality reconstructed videos compared to using MPEG and uniform quantization. Furthermore, the quantization matrix is robust against variations in the mean and standard deviations of the CS measurements among frames. Our work shows how quantization can be implemented for a practical CVS codec.

关键词： Quantization Compressed sensing Video compression transform coding Video coding Decoding Discrete cosine transforms Videoconference Robustness Discrete wavelet transforms

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Development of secure encoder-decoder for JPEG images

Development of secure encoder-decoder for JPEG images

引用

International Conference on Computer Engineering and Systems

作者： Ghada Hamissa Amany Sarhan Hatem Abd Elkader Mahmoud Fahmy Electrical Engineering Department Faculty of Engineering KFS University Kafr el-Sheikh Egypt Information System Department Faculty of Computer & Information Menoufia University Menoufia Egypt Computer & Automatic Control Department Computer & Automatic Control Department Tanta University Tanta Egypt Computer & Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt

Digital image copyrights and image authentication draw a great attention specially in critical image communications. This paper presents a proposal for a new encoder-decoder, which we call SecEncoDeco, for securing JPEG images. An extra stage of security is embedded in the traditional JPEG codec. This security stage uses the Secure Hill cipher technique. This encryption technique has many advantages over the traditional Hill cipher. The Safe Time of the Secure Hill cipher is deduced and presented in detail. Implementation of the proposed method is built based on MATLAB. Complete evaluation for the proposed codec is performed which indicates the effectiveness of the proposed secure codec for image copyright protection.

关键词： Image coding Encryption transform coding Computer architecture Decoding Time measurement

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Best wavelet packet bases in a JPEG2000 rate-distortion sense: The impact of header data

Best wavelet packet bases in a JPEG2000 rate-distortion sens...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Thomas Stütz Bernhard Mühlbacher Andreas Uhl Department of Computer Sciences University of Salzburg Austria

This paper discusses optimal wavelet packet basis selection within JPEG2000. Two algorithms of Lagrangian rate distortion optimal wavelet packet basis selection for JPEG2000 are presented. The first and more conservative approach considers the JPEG2000 packet body data in the rate distortion optimization only, while the other technique additionally integrates packet header data. The algorithms are evaluated on the FVC2004 fingerprint databases and other textured image data. Results demonstrate that inclusion of header data information into rate distortion optimization leads to superior compression results. For the first time the maximum performance gains of custom isotropic wavelet packets in JPEG2000 can be assessed.

关键词： transform coding Image coding Rate-distortion Wavelet packets Encoding Databases

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Low-complexity JPEG-based progressive video codec for wireless video transmission

Low-complexity JPEG-based progressive video codec for wirele...

引用

International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Anna Ukhanova Søren Forchhammer DTU Fotonik Technical University of Denmark Denmark

This paper discusses the question of video codec enhancement for wireless video transmission of high definition video data taking into account constraints on memory and complexity. Starting from parameter adjustment for JPEG2000 compression algorithm used for wireless transmission and achieving the best possible results by tuning settings, this work proceeds to develop a low-complexity progressive codec based on JPEG, which is compared to the tuned JPEG2000. Comparison to H.264/SVC for this codec is also given. As the results show, our simple solution on low rates can compete with JPEG2000 and H.264/SVC for specific video content.

关键词： Image coding transform coding Tiles Complexity theory Wireless communication Codecs Static VAr compensators

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An investigation in dehazing compressed images and video

An investigation in dehazing compressed images and video

引用

OCEANS

作者： Kristofor Gibson Dũng Võ Truong Nguyen Space and Naval Warfare System Center Pacific San Diego CA USA Department of Electrical and Computer Engineering University of California San Diego La Jolla CA USA

ISBN: (纸本)9781424443321

This paper proposes a novel method for single image dehazing that operates at a faster speed than current methods for implementation in video enhancements. We provide a comparison of our proposed dehazing method with current state of the art methods. We then consider the effect of compression by investigating the blocking and ringing artifacts in cases of applying any dehazing method before or after compression. Based on an investigation with the JPEG model, we conclude that the best dehazing performance (with less artifacts) is achieved if the dehazing is applied before compression. Simulations for both JPEG images and H.264 compressed sequences validate our conclusion.

关键词： Image coding transform coding Image reconstruction Scattering Image color analysis Noise Discrete cosine transforms

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An uncompressed benchmark image dataset for colour imaging

An uncompressed benchmark image dataset for colour imaging

引用

IEEE International Conference on Image Processing

作者： Gerald Schaefer Department of Computer Science Loughborough University Loughborough UK

Virtually all vision and imaging applications and algorithms require validation and evaluation, yet benchmarking and evaluation have proven to be difficult and challenging. This is partly due to the amount of work involved in performing an appropriate and convincing test, but is also often hindered by the fact that there are rather few test datasets that are publicly available. In this paper we present UCID10K, an image database comprising 10,000 colour images. Importantly, all images in the dataset are captured and preserved in uncompressed form allowing its use for benchmarking a variety of imaging applications including image compression, colour quantisation, steganography and image forensics. In addition, a ground truth for the evaluation of content-based image retrieval algorithms is provided enabling the UCID dataset to be used for assessing the performance of image querying techniques but also the testing of compressed-domain retrieval techniques. The UCID10K database is publicly available to fellow researchers.

关键词： Image coding Image color analysis Benchmark testing Image retrieval transform coding Forensics

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Incorporating video in platform-independent video games using open-source software

Incorporating video in platform-independent video games usin...

引用

International Conference on Computer Science and Information Technology (CSIT)

作者： Tong Lai Yu David Turner David Stover Arturo Concepcion Department of Computer Science and Engineering California State University San Bernardino CA USA

In a video game, it is common to embed a prerecorded video and play it at various times during the game for the purposes of narrative, tutorials, hints, or any other goal that the developer sees fit in the game. It is a challenging task to play the embedded video in a cross-platform video game at multiple locations of the screen simultaneously and on an arbitrary surface. This paper describes the use of open-source resources to accomplish such a task. The open-source FFmpeg library is employed to decode video saved in commonly-used video formats such as MPEG-4, AVI or MOV. The platform-independent Simple DirectMedia Layer (SDL) library is used to render video and audio and to handle threading features. The producer-consumer paradigm is employed to separate the tasks of data decoding from data rendering which are run in different threads.

关键词： Streaming media transform coding Graphics Engines Data models Graphical user interfaces Software

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Rate-distortion development for optimal truncation in JPEG2000 imagery

Rate-distortion development for optimal truncation in JPEG20...

引用

International Symposium on Communications Control and Signal Processing (ISCCSP)

作者： Eric J. Balster Benjamin T. Fortener William F. Turri Department of Electrical and Computer Engineering Kettering Laboratory University of Dayton Dayton OH USA University of Dayton Research Institute Dayton OH USA

This paper presents a development of the post compression rate-distortion optimization (PCRD-opt) algorithm in JPEG2000 used for optimal truncation (OT) rate control. The proposed treatment of PCRD-opt differs from the treatment given in the JPEG2000 standard and what is given in a number of publications, indicating an error in the published literature. The proposed algorithm is implemented in a complete JPEG2000 compression engine as well as the algorithm published in the JPEG2000 standard. The proposed algorithm gives a substantial performance gain, out performing the implementation given in the standard by 0.25-1 dB in PSNR on average, demonstrating that the method for PCRD-opt given in the standard is incorrect. The proposed algorithm is also compared to the JPEG2000 reference implementation, JasPer, and the popular Kakadu JPEG2000 compressor. The proposed algorithm provides equivalent performance results to both JasPer and Kakadu, indicating that the proposed PCRD-opt treatment provides correct OT of JPEG2000 compressed imagery.

关键词： Rate-distortion transform coding Image coding Signal processing algorithms Optimal control Code standards Standards publication Educational institutions Image segmentation Quantization

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Expressive MPEG-4 Facial Animation Using Quadratic Deformation Models

Expressive MPEG-4 Facial Animation Using Quadratic Deformati...

引用

International Conference on Computer Graphics, Imaging and Visualization, CGIV

作者： Mohammad Obaid Ramakrishnan Mukundan Mark Billinghurst Catherine Pelachaud Computer Science and Software Engineering Department University of Canterbury Christchurch New Zealand Computer Science and Software Engineering Department University of Canterbury New Zealand HITLab New Zealand University of Canterbury Christchurch New Zealand CNRS-LTCI Telecom ParisTech Paris France

In this paper we propose an approach compliant with the MPEG-4 standard to synthesize and control facial expressions generated using 3D facial models. This is achieved by establishing the MPEG-4 facial animation standard conformity with the quadratic deformation model representations of facial expressions. This conformity allows us to utilize the MPEG-4 facial animation parameters (FAPs) with the quadratic deformation tables, as a higher layer, to compute the FAP values. The FAP values for an expression E are computed by performing a linear mapping between a set of transformed MPEG-4 FAP points (using quadratic deformation models) and the 3D facial model semantics. The nature of the quadratic deformation model representations of facial expressions can be employed to synthesize and control the six main expressions (smile, sad, fear, surprise, anger, and disgust). Using Whissel's psychological studies on emotions we compute an interpolation parameter that is used to synthesize intermediate facial expressions. The paper presents results of experimental studies performed using the Greta embodied conversational agent. The achieved results are promising and can lead to future research in synthesizing a wider range of facial expressions.

关键词： transform coding Facial animation Three dimensional displays Computational modeling Deformable models Solid modeling Muscles

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An Increased Throughput FPGA Design of the JPEG2000 Binary Arithmetic Decoder

An Increased Throughput FPGA Design of the JPEG2000 Binary A...

引用

Proceedings of the Digital Image Computing: Technqiues and Applications (DICTA)

作者： David Lucking Eric Balster Air Force Research Laboratory OH USA University of Dayton Dayton OH USA

As digital imaging techniques continue to advance, new image compression standards are needed to keep the transmission time and storage space low for increasing image sizes. The Joint Photographic Expert Group (JPEG) fulfilled this need with the ratification of the JPEG2000 standard in December of 2000. JPEG2000 adds many features to image compression technology but also increases the computational complexity of traditional encoders. To mitigate the added computational complexity, the JPEG2000 algorithm allows processing parts in parallel, increasing the benefits of implementing the algorithm in application specific integrated circuits (ASICs) or field programmable gate arrays (FPGAs). A flexible FPGA implementation of the JPEG2000 binary arithmetic decoder, the core component of the JPEG2000 decoding algorithm, is presented in this paper. The proposed JPEG2000 binary arithmetic decoder reduces the amount of resources used on the FPGA allowing 17% more entropy block decoders to fit on chip and consequently increasing the throughput by 35% beyond previous designs.

关键词： Decoding transform coding Clocks Registers Throughput Field programmable gate arrays Image color analysis

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