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检索条件"主题词=distributed video coding"

共 416 条记录，以下是161-170 订阅

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Rate-distortion Based Selective Decoding for Pixel-Domain distributed video coding

Rate-distortion Based Selective Decoding for Pixel-Domain Di...

引用

15th IEEE International Conference on Image Processing (ICIP 2008)

作者： Chien, Wei-Jung Karam, Lina J. Abousleman, Glen P. Arizona State Univ Dept Elect Engn Tempe AZ 85287 USA Gen Dynam C4 Syst Video Compress & Exploitat Lab Scottsdale AZ 85257 USA

ISBN: (纸本)9781424417650

This paper presents a rate-distortion based selective decoding for pixel-domain distributed video compression (DVC) system. In the proposed system, the Wyner-Ziv frames are divided into several sub-images. Each of these sub-images is encoded and decoded independently. At the decoder, the rate-distortion ratio is estimated for each bitplane of the sub-images. Only the bitplanes with high rate-distortion ratios are Turbo decoded. A minimum-distance symbol reconstruction is proposed to estimate the rest of the bitplanes by using the side information and Turbo-decoded bitplanes. More accurate placement of the parity bits results in an improved system performance, especially for video sequences with a relatively large static background. coding results and comparison with existing DVC schemes and with H.264 interframe coding are presented to illustrate the performance of the proposed system.

关键词： distributed video coding Rate distortion Wyner-Ziv coding

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TRANSFORM DOMAIN distributed video coding USING LARGER TRANSFORM BLOCKS 5

TRANSFORM DOMAIN DISTRIBUTED VIDEO CODING USING LARGER TRANS...

引用

5th IEEE Global Conference on Signal and Information Processing (GlobalSIP)

作者： Mahmood, Asif Dooley, Laurence S. Wong, Patrick Open Univ Sch Comp & Commun Milton Keynes Bucks England

ISBN: (纸本)9781509059904

distributed video coding (DVC) displays promising performance at low spatial resolutions but begins to struggle as the resolution increases. One of the limiting aspects is its 4x4 block size of Discrete Cosine Transform (DCT) which is often impractical at higher resolutions. This paper investigates the impact of exploiting larger DCT block sizes on the performance of transform domain DVC at higher spatial resolutions. In order to utilize a larger block size in DVC, appropriate quantisers have to be selected and this has been solved by means of incorporating a content-aware quantisation mechanism to generate image specific quantisation matrix for any DCT block size. Experimental results confirm that the larger 8x8 block size consistently exhibit superior RD performance for CIF resolution sequences compared to the smaller 4x4 block sizes. Significant PSNR improvement has been observed for 16x16 block size at 4CIF resolution with up to 1.78dB average PSNR gain compared to its smaller block alternatives.

关键词： distributed video coding wyner-ziv video coding discrete cosine transform transform block size high resolution

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A NEW APPROACH TO GENERATE SIDE INFORMATION FOR distributed video coding IN CAPSULE ENDOSCOPY

A NEW APPROACH TO GENERATE SIDE INFORMATION FOR DISTRIBUTED ...

引用

6th International Symposium on Communications, Control and Signal Processing (ISCCSP)

作者： Boudechiche, Djamel Eddine Benierbah, Said Khamadja, Mohammed Univ Constantine 1 SP Lab Dept Elect Fac Sci & Tech Constantine Algeria

ISBN: (纸本)9781479928903

This paper presents a new approach to generate side information for distributed video coding (DVC) for wireless capsule endoscopy (WCE). WCE allowed facilitating the diagnosis;however, the problem of low energy limits its image quality and duration of use. To reduce this problem, the proposed codec uses a database to generate side information (SI), by exploiting similarity in human anatomy rather than motion compensation. The first test results prove the feasibility of this technique and show good compression and good image quality compared to JPEG.

关键词： Capsule endoscopy distributed video coding Database Side information Medical imaging

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A GENETIC ALGORITHM FOR SIDE INFORMATION ENHANCEMENT IN distributed video coding

A GENETIC ALGORITHM FOR SIDE INFORMATION ENHANCEMENT IN DIST...

引用

16th IEEE International Conference on Image Processing

作者： Yaacoub, Charles Farah, Joumana Pesquet-Popescu, Beatrice Holy Spirit Univ Kaslik Fac Sci & Comp Engn Jounieh Lebanon Telecom Paris Tech Signal & Image Proc Dept Paris France

ISBN: (纸本)9781424456536

This work aims at improving the quality of the side information in distributed video coding. Based on genetic algorithms, our proposed technique combines several frames, interpolated using previously developed methods, in a fusion-based approach. Simulation results show a significant improvement in the side information quality compared to other interpolation techniques available in the literature, which greatly improves the rate-distortion performance of a distributed video codec, where the gain in PSNR can reach 6dB.

关键词： distributed video coding frame interpolation genetic algorithms side information Wyner-Ziv coding

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Performance evaluation of distributed video coding schemes

Performance evaluation of Distributed Video Coding schemes

引用

33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Bernardini, R. Rinaldo, R. Zontone, P. Vitali, A. Univ Udine DIEGM Via Sci 208 I-33100 Udine Italy ST Microelect I-20041 Agrate Brianza Italy

ISBN: (纸本)9781424414833

distributed video coding (DVC) has recently been proposed for emerging scenarios, where sources of correlated video do not communicate, as in some video-surveillance applications, or to simplify the coder for video equipment with power consumption constraints. In this paper we propose and compare different DVC schemes. In particular, we propose the use of the wavelet transform and analyze the performance of encoders based on turbo-codes and on a novel modulo-reduction procedure. The proposed schemes do not need feedback from the receiver and use statistical models for the estimation of the required bit-rate. Experimental results show that the proposed schemes have good performance when compared with Similar asymmetric video compression schemes, and that DVC can be an interesting option in appropriate scenarios.

关键词： distributed video coding source coding

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MULTIPLE CHANNEL DIVISION FOR EFFICIENT distributed video coding

MULTIPLE CHANNEL DIVISION FOR EFFICIENT DISTRIBUTED VIDEO CO...

引用

16th IEEE International Conference on Image Processing

作者： Park, Sang-Uk Lee, Young-Yoon Choi, Jin-Woo Kang, Jung-Won Kim, Chang-Su Lee, Sang-Uk Seoul Natl Univ Sch Elect Engn Seoul 151 South Korea Korea Univ Sch Elect Engn Seoul South Korea Samsung Elect Co Seoul South Korea ETRI Seoul South Korea

ISBN: (纸本)9781424456536

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： distributed video coding Wyner-Ziv coding side information generation and channel division

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Rate allocation algorithm for pixel-domain distributed video coding without feedback channel

Rate allocation algorithm for pixel-domain distributed video...

引用

32nd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Morbee, Marleen Prades-Nebot, Josep Pizurica, Aleksandra Philips, Wilfried Univ Ghent TELIN Ghent Belgium Univ Politecn Valencia GTS ITEAM Valencia Spain

ISBN: (纸本)9781424407286

in some video coding applications, it is desirable to reduce the complexity of the video encoder at the expense of a more complex decoder. distributed video (DV) coding is a new paradigm that aims to achieve this. To allocate a proper number of bits to each frame, most DV coding algorithms use a feedback channel (FBC). However, in some cases, a FBC does not exist. In this paper, we therefore propose a rate allocation (RA) algorithm for pixel-domain distributed video coders without FBC. Our algorithm estimates at the encoder the number of bits for every frame without significantly increasing the encoder complexity. Experimental results show that our RA algorithm delivers satisfactory estimates of the adequate encoding rate, especially for sequences with little motion.

关键词： distributed video coding Wyner-Ziv coding rate allocation

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Low-complexity TTCM based distributed video coding architecture

引用

2nd IEEE Pacific Rim Symposium on video and Technology

作者： Martfnez, J. L. Fernando, W. A. C. Weerakkody, W. A. R. J. Oliver, J. Lopez, O. Martinez, M. Perez, M. Cuenca, P. Quiles, F. Univ Castilla La Mancha Albacete Res Inst Informat Albacete 02071 Spain Univ Surrey Ctr Commun Res Guildford Surrey England Univ Politecn Valencia Dept Comp Engn Valencia Spain Miguel Hernandez Univ Dept Phys & Comp Engn Murcia Spain

ISBN: (纸本)9783540771289

distributed video coding (DVC) is a promising coding solution for some emerging applications, where the encoder complexity, power consumption or memory requirements are constraint the system resources. Current approaches to DVC focus on improving the performance of the Wyner-Ziv coding by improving the quality of the reconstructed side information or by improving the quality of channel codes. Up to date, no attention has been paid to the problem of key frames coding where a low-encoding complexity scenario is also needed. This work focuses on key frames coding in its effect to the Wyner-Ziv frames decoding aiming to implement a very low-complexity Turbo Trellis Coded Modulation (TTCM) based DVC architecture. In this paper, we propose a new key frame coding scheme which has very low complexity and memory requirements for the TTCM based distributed video codec. Results show that the proposed intra frame codec for key frame coding outperforms the JPEG2000 and the Intra H.264 AVC codecs in terms of encoding-time and memory requirements, with better RD performance.

关键词： distributed video coding low complexity TTCM codes

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ADAPTIVE USE OF SYSTEMATIC BITS IN distributed video coding WITH MULTIPLE PUNCTURING MATRICES

ADAPTIVE USE OF SYSTEMATIC BITS IN DISTRIBUTED VIDEO CODING ...

引用

IEEE Visual Communications and Image Processing (VCIP)

作者： Taieb, Mohamed Haj Chouinard, Jean-Yves Wang, Demin Univ Laval Quebec City PQ G1V 0A8 Canada Commun Res Ctr Canada Ottawa ON K2H 8S2 Canada

ISBN: (纸本)9781467344050;9781467344067

distributed video coding paradigm aims at transferring the major part of the processing computation effort from the encoder to the decoder. Motion interpolation is done at the decoder to generate side information (SI) through motion compensated temporal interpolation (MCTI). SI is considered as a noisy version of the original data: channel control coding schemes, such as turbo coding, are used to eliminate the errors (SI inaccuracies). The video data is turbo encoded and the parity bits are sent to the decoder. The systematic bits, however, are discarded since the decoder already disposes of SI that can be used for the channel likelihood ratio calculations. However, when the MCTI generation of SI is highly corrupted, the channel likelihood ratios based on the SI are inefficient and even misleading. A number of parity bits number exceeding the original data length may then be required, thus leading to an undesirable expansion effect. In this paper, we propose a method to detect adaptively the situations where the SI is of lower quality. Then puncturing matrices, enabling systematic bits, are used to help computing reliable channel likelihood ratios. An improvement up to 0.5 dB is reported for PSNRs vs bit rate performances.

关键词： distributed video coding turbo coding motion interpolation puncturing

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Side information generation for distributed video coding

Side information generation for distributed video coding

引用

IEEE International Conference on Image Processing (ICIP 2007)

作者： Lu, Ligang He, Dake Jagmohan, Ashish IBM TJ Watson Res Ctr Washington DC USA

ISBN: (纸本)9781424414369

Side information(SI) generation is one of the key components of a Wyner-Ziv coder. In this paper we present a novel multi-frame SI generation approach which uses adaptive temporal filtering to estimate the pixel values for SI and motion vector filtering for refinement. For temporal filtering, we derive the optimal mean squared error temporal filter when the noise can be evaluated, and propose a similarity weighted temporal filter when the knowledge of the noise is not available. The temporal filter adapts on the quality of the motion estimation. The quality of SI generation is further improved by using motion vector filtering to reduce the noise effect from motion estimation. Experimental results indicate that the proposed SI generation approach yields good performance in terms of SI quality and conditional entropy.

关键词： wyner-Ziv coding Slepian-Wolf decoding distributed video coding side information generation adaptive temporal filtering motion vector filtering

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