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In this paper, a simple, efficient, low power off-chip memory design is proposed, which fully exploits the features of DRAM memory and video application, as well as overcomes the drawbacks of algorithm complexity and system modification of embedded compression, which is a popular way to decrease power consumption of the off-chip memory. The integration of the scheme into video decoder will not involve...
The application of distributed coding in many media applications, where low power and low-complexity encoder device is essential, is a new paradigm. In this paper, we propose a new pixel-domain Distributed Video Coding (DVC) scheme, in which both temporal and spatial correlations are exploited at the decoder. The Slepian-Wolf decoder is modified by introducing a source decoder to exploit Wyner-Ziv...
In this paper, we propose a new compression artifact removable method for MPEG-2 moving pictures. We utilize the Total Variation (TV) regularization method, and obtain a texture component in which blocky noise and mosquito noise are decomposed. These artifacts are removed by using selective filters controlled by the edge information from the structure component and the motion vectors. The experimental...
Following with the advancements in digitization technology and broadband communication technology, realtime video streaming service has become an essential one for next generation Internet. When transmitting compressed video across the Internet, however, one of the main challenges is packet error/loss. High coding dependencies among video frames suffer from vulnerability to packet loss, which impacts...
Bitrate adaptation and higher compression ratio are the major issues in world of Video compression. H.264 is the latest standard for video compression with high flexibility in compression ratio, quality of video and rate adaptation. This paper explores the possibility of bitrate reduction and proposes an algorithm to calculate the cost of each 8x8 subMacroblocks. Based on the threshold and the cost...
This paper focuses on the rate-distortion optimization of low-delay 3D video communications based on the latest H.264/MVC video coding standard. The first part of the work proposes a new low-complexity model for distortion estimation suitable for low-delay stereoscopic video communication scenarios such as 3D videoconferencing. The distortion introduced by the loss of a given frame is investigated...
H.264 adopts variable length coding and interprediction techniques, so compressed image is very sensitive to channel error. Meanwhile errors will influence subsequent frames, easily leading to the distortion of rebuilding images. To enhance the quality of reconstructed images, this text proposes a weighted outer boundary matching algorithms based on multiple reference frames, which exploits the characteristic...
Video compression and streaming over lossy wireless networks is the current trend in telecommunication and encouraged by major carriers to increase their services portfolio. However, the technological challenges are still tackled to enable the delivery of high quality video. In our previous work, we developed a per stream distortion model that is based on the extended Gilbert model. We expanded our...
In H.264/AVC, multiple reference frames are adopted to enhance inter-predictive coding efficiency of motion estimation/compensation. However, memory cost is also increased with the number of used reference frames. This work presents a size-controllable memory reduction method to accommodate multiple reference frames at a limited memory size. This scheme is to store some of Macro-Blocks (MBs) as compressed...
H.264/AVC video encoding standard is a successful video compression standard after the MPEG-2/H.262. It's received much attention from academic and industrial fields. In this paper, rate control algorithm is discussed. By noticing that the H.264/AVC rate control algorithm has some disadvantages, two frame layer rate control improvement strategies are proposed in this paper, which are based on the...
Compressed video data is very sensitive to channel-induced errors and network losses. Most conventional unequal error protection techniques involve forward error correction codes of different rates or asymmetric signal constellations for data of different priorities. It is yet unknown if combining the above two techniques can further improve performance. In this paper, we investigate rate-compatible...
In H.264/MPEG-4 AVC, the quantized coefficients are typically scanned in a fixed zig-zag pattern. This fixed scanning order may not always be optimal for entropy coding. To achieve better entropy coding gain in inter-frame coding, we propose a predictive scan ordering scheme and show that additional inter-frame coding redundancy can be removed by our proposed method. The scanning orders are dynamically...
This paper describes an efficient entropy coding method for macroblock modes in H.264 based on the statistical information of the previous frame. H.264/MPEG-4 AVC video coding introduces some new macroblock sub-types (modes) that allow for better rate-distortion (R-D) coding. These modes are coded with a fixed mapping table when context adaptive variable length coding (CAVLC) is used. Based on our...
The new JPEG XR image encoding standard offers a great compression rate while maintaining a good visual quality. Nonetheless, it has low error robustness, making it unusable in case of unreliable transmission over error prone channels, e.g., wireless channels. An improvement to the standard was developed, which can correct transmission errors, both bit or packet losses, and which is fully compatible...
The delivery of High Definition Television (HDTV) over IP networks, namely the HD IPTV, has emerged as one of the major distribution and access techniques for broadband multimedia services. IPTV adopts H.264/AVC as its coding standard due to its high video compression efficiency as well as powerful error resilience features. This paper presents studies on some of these features applied to HD IPTV...
We propose a novel standard-compliant multiple description coding (MDC) method that exploits the H.264/AVC redundant slice tool, performing rate-distortion optimization at the slice level. The strategy to allocate redundancy to each slice jointly takes into account its contribution to distortion, its position in the GOP, the effect of decoder error concealment, and the transmission conditions. This...
Nowadays, TV broadcasting has found its application in mobile terminal, however, due to the prediction structure of video coding standards, compressed video bitstreams are vulnerable to wireless channel disturbances for real-time transmission. In this paper, we propose a novel temporal error concealment method for mobile TV sequences. The proposed ordering methods utilizes continuity feature among...
Distributed Video Coding (DVC) is a new paradigm for video compression, which is particularly attractive due to its flexibility to introduce very simple encoder structure. However, most DVC systems are unable to adapt to the bandwidth variations. In this paper we propose a scalable DVC scheme, which can adjust the bit-rate linearly depending on the available bandwidth, and thereby achieves optimal...
In this paper, the authors propose a novel method to measure the perceived picture quality of H.264 coded video based on hybrid no reference framework. The latter term means that the proposed model uses only receiver-side information for objective video quality assessment, but analyzes both the compressed bitstream and baseband signals of the decoded picture to improve the estimation accuracy of the...
This paper presents a novel algorithm for content adaptive GOP size control in distributed video coding. The GOP size is dynamically varied along the sequence, depending on motion activity. Automatic mode selection allows the system to switch between H.264 intra-coding and Wyner-Ziv coding modes to optimize the overall performance. Furthermore, the encoder determines a suitable compression ratio for...
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