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检索条件"主题词=transform coding"

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A filter banks design using a multiobjecive genetic algorithm for an image coding scheme

A filter banks design using a multiobjecive genetic algorith...

引用

IEEE International Conference on Image Processing

作者： A. Boukhobza A. Bounoua A. Taleb Ahmed N. Taleb RCAM Laboratory of research University of Sidi-Bel Abbes Algeria LAMIH Laboratory of research University of Valenciennes Valenciennes France

In this paper, we present a global optimisation method based on a multi-objective Genetic Algorithm (GA) for the design of filter banks in a lossy image coding scheme. To be effective, the filter banks should satisfy a number of desirable criteria related to such scheme. We formulate the optimization problem as multi-objective and we use the Non-dominated Sorting Genetic Algorithm approach (NSGAII) to solve this problem by searching solutions that achieve the best compromise between the different objectives criteria, these solutions are known as Pareto Optimal Solutions. Flexibility in the design is introduced by relaxing Perfect Reconstruction (PR) condition and defining a PR violation measure as an objective criterion to maintain near perfect reconstruction (N-PR) solutions. Furthermore, the optimized filter banks are near-orthogonal. This can only be made possible by minimizing the deviation from the orthogonality in the optimization process. Our designed filter banks lead to a significant improvement in performance of coding with respect to the 9/7 filter bank of JPEG2000 at high compression ratios and offer a slight improvement at low compression ratios.

关键词： Filter bank Algorithm design and analysis Genetic algorithms Image coding Image reconstruction Optimization methods Pareto optimization Sorting Process design transform coding

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Learning-based multiview video coding

Learning-based multiview video coding

引用

Picture coding Symposium, PCS

作者： Baochun Bai Li Cheng Cheng Lei Pierre Boulanger Janelle Harms Department of Computing Science University of Alberta Edmonton Canada Toyota Technical Institute Chicago IL USA

In the past decade, machine learning techniques have made great progress. Inspired by the recent advancement on semi-supervised learning techniques, we propose a novel learning-based multiview video compression framework. Our scheme can efficiently compress the multiview video represented by multiview-video-plus-depth (MVD) format. We model the multiview video compression problem as a semi-supervised learning problem and design sophisticated mechanisms to achieve high compression efficiency. Our approach is significantly different from the traditional hybrid coding scheme such as H.264-based multiview video coding methods. The preliminary results show promising compression performance.

关键词： Video coding Video compression Semisupervised learning Image coding Machine learning Three dimensional TV transform coding Decoding Electromagnetic interference Nearest neighbor searches

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Improved low delay distributed video coding

Improved low delay distributed video coding

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Picture coding Symposium, PCS

作者： Hongbin Liu Yongpeng Li Xianming Liu Siwei Ma Debin Zhao Wen Gao Department of Computer Science and Technology Harbin Institute of Technology Harbin China Chinese Academy of Sciences Beijing China Institute of Digital Media School of Electronic Engineering and Computer Science Peking University Beijing China

This paper proposes an image partition based approach to enhance side information quality in low delay distributed video coding (DVC). The proposed method employs a checkerboard pattern to group blocks of the Wyner-Ziv frame into two sets, where one set is DPCM encoded and the other set is DVC encoded. These two sets are encoded independently and decoded successively. At decoder, DPCM set will be first reconstructed. Then the temporal concealment tool, such as boundary matching algorithm, is performed to conceal blocks in the DVC set. An improved side information is subsequently obtained for DVC set, based on which a higher compression can be achieved. Simulation results indicate that a more promising performance can be achieved when compared with existing motion extrapolated approach.

关键词： Delay Video coding Decoding Computer science Video compression Image reconstruction Computational modeling transform coding Motion estimation Broadcasting

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Multiple channel division for efficient distributed video coding

Multiple channel division for efficient distributed video co...

引用

IEEE International Conference on Image Processing

作者： Sang-Uk Park Young-Yoon Lee Jin-Woo Choi Jung-Won Kang Chang-Su Kim Sang-Uk Lee School of Electrical Engineering and INMC Seoul National University South Korea Media Coding Laboratory Samsung Electronics Company Limited South Korea Electronics and Telecommunications Research Institute South Korea School of Electrical Engineering Korea University South Korea

A novel concept of channel division to improve the performance of distributed video coding is proposed in this work. At the decoder, the proposed algorithm partitions each side information frame into multiple regions with different expected distortions. It is shown that the partitioning is equivalent to the division of the virtual noisy channel from the encoder to the decoder into multiple channels. Then, the proposed algorithm analyzes the noise characteristics of those multiple channels, and allocates a limited bit budget to those channels adaptively to improve the rate-distortion performance. Simulation results demonstrate that the proposed algorithm provides up to 5 dB better performance than the conventional DVC algorithms, as well as reduces the decoding complexity significantly.

关键词： Video coding Decoding Error correction Partitioning algorithms Performance analysis Algorithm design and analysis Rate-distortion transform coding Mobile communication Feedback

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Symmetric distributed multiview video coding

Symmetric distributed multiview video coding

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Baochun Bai Yang Yang Cheng Lei Pierre Boulanger Janelle Harms Department of Computing Science University of Alberta Edmonton Canada Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

Symmetric distributed source coding has made great progress in the past several years. However, few attempts have been tried to use the symmetric distributed source coding schemes in real data compression scenarios. In this paper, with the inspiration of previous symmetric distributed source coding schemes, we first put forward a novel syndrome-based symmetric distributed coding scheme which can achieve the whole Slepian-Wolf rate region. Then we propose a general architecture for symmetric distributed multiview video schemes. Our experiments show very encouraging results. In the high-rate case, our scheme can achieve great rate saving from separate H.264 coding scheme at the same video quality.

关键词： Video coding Source coding Video compression Parity check codes Video codecs Cameras Decoding Wireless sensor networks transform coding Statistical distributions

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coding artifact reduction by temporal filtering

Coding artifact reduction by temporal filtering

引用

IEEE International Symposium on Consumer Electronics (ISCE)

作者： Martin M. Richter Carsten Dolar Hartmut Schroder Circuits and Systems Laboratory Technical University Dortmund Dortmund Germany

In this paper the potential improvements by temporal coding artifact reduction are discussed. Whereas conventional spatial methods may suffer from flicker in the processed output due to variable intra frame processing or insufficient removal of coding artifacts, the temporal strategies are capable of flicker reduction and even re-establishment of details missing in the actual input frame. In addition to several temporal filter strategies a new concept for estimating the true motion over multiple input frames is proposed. As a result an image content adaptive spatio-temporal artifact reduction system is presented yielding an even higher output quality.

关键词： Filters Motion estimation Filtering Hardware Consumer electronics Circuits and systems Laboratories Spatiotemporal phenomena Motion compensation transform coding

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coding artifacts reduction method based on a perceptually-weighted variational approach

Coding artifacts reduction method based on a perceptually-we...

引用

IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Q.B. Do M. Luong A. Beghdadi L2TI Institut Galile Universitè Paris 13 Villetaneuse France

A new adaptive post-processing method for reducing blocking and ringing effects is proposed. This approach exploits some characteristics of the human visual system (HVS), namely the just noticeable contrast (JNC) and the luminance adaptation. The method is based on a perceptually-weighted total variation regularization approach constrained by the knowledge of a prior information derived from some structural features maps extracted from the image. The performance of the proposed method is evaluated objectively and subjectively in terms of blocking and ringing visibility. The proposed method is also compared to the state of arts.

关键词： transform coding TV Smoothing methods Virtual manufacturing Humans Visual system Feature extraction Data mining Art Video compression

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Comparison of Dirac and H.264/AVC coding Quality Using Objective Video Quality Measures

Comparison of Dirac and H.264/AVC Coding Quality Using Objec...

引用

International Conference on Systems, Signals and Image Processing, IWSSIP

作者： Emil Dumic Mario Mustra Sonja Grgic Department of Wireless Communications Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

Digital video braodcasting requires high image quality, keeping the bitrate as low as possible at the same time. In the digital photography, new image compression standard named JPEG2000 proves to be more efficient than JPEG in subjective evaluation. JPEG2000 uses discrete wavelet transform (DWT) while JPEG uses discrete cosine transform (DCT). In video coding there are two most popular multi-purpose coding formats, MPEG-2 and H.264/AVC also known under the name MPEG-4 Part 10. Both of these formats use DCT. This paper present comparison of the coding quality of H.264/AVC and newly developed Dirac codec. Dirac codec unlike H.264/AVC uses DWT. For the quality comparison of two standards, PSNR, VQM and SSIM methods are used.

关键词： Automatic voltage control transform coding Image coding Discrete wavelet transforms Discrete cosine transforms Video compression Codecs Image quality Bit rate Digital photography

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A Low Complexity Error Concealment Method for H.264 Video coding Facilitating Hardware Realization

A Low Complexity Error Concealment Method for H.264 Video Co...

引用

International Symposium on Parallel Architectures, Algorithms and Networks (ISPAN)

作者： Tao-Cheng Chang Hung-Wei Shen Jiun-In Guo Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan

This paper presents a new error concealment algorithm, which is suitable for the H.264/AVC coding standard and the hardware implementation. This algorithm can be dividing into two major categories. In the spatial domain, we use the reliable neighboring pixel values with edge detection method to conceal all the lost pixels in the block. In the temporal domain, we propose a variable block size error concealment method. It consists of a block size determination step to determine the type of the lost macro-block and a motion vector recovery step to find the optimal motion vector from the current frame. In the block size determination step, we propose a criterion to determine the size type of the lost block from the neighbor's macro-blocks. In the motion vector recovery step, the optimal motion vector for the lost block chosen from the neighbor's block in the current frame. And it is the minimum value of the side match distortion of the lost block. This proposed algorithm can not only determine the most correct mode for the lost block in a easy way, but also save the much more computation time for error concealment, which is more suitable for hardware implementation.

关键词： Video coding Hardware Interpolation Decoding Automatic voltage control Video compression Computer errors transform coding Computer science Image edge detection

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Multiple description coding in the quincunx sub-sampling lattice with diamond-shape DCT

Multiple description coding in the quincunx sub-sampling lat...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Siu-Kei Au Yeung Bing Zeng Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)9781424438273

Pixel-domain sub-sampling based on the quincunx lattice is one of the traditional approaches to carry out multiple description coding (MDC). Unfortunately, the re-alignment (either horizontal or vertical) would deteriorate the sample correlation within each description, thus leading to a lower coding efficiency. In this paper, we propose to apply a diamond-shape DCT on the quincunx sub-sampling lattice to create an MDC representation. A theoretical analysis is first presented assuming the covariance matrix of the Toeplitz type. The results show that such DS-DCT can achieve a better coding gain as well as energy packing efficiency as compared to the normal DCT with re-alignment. Then, the proposed DS-DCT is tested on various images using the standard JPEG compression scheme and the results show that it out-performs the traditional re-alignment approach by a similar margin as obtained in our theoretical analysis.

关键词： Lattices Discrete cosine transforms Decoding Covariance matrix Testing Redundancy Pixel Gold transform coding Image coding

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