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Blocking artifact is one of the annoying problems that can significantly decrease the objective and subjective quality of low bit-rate video. In the transform domain Wyner-Ziv (TDWZ) video coding, two operations could result in blocking artifacts, namely the Discrete Cosine Transform (DCT) based operation and the block based motion compensation. We introduce Least Square prediction (LSP) into TDWZ...
Distributed Video Coding (DVC) in transform domains could yield significant coding gains over the pixel domain. While employing different coding modes in DVC, it is still difficult to fully compress the source data without increasing the complexity at the encoder side. In this paper, we first propose a particular Run-Length-Coding (RLC) coding mode to efficiently compress the continuous zero symbols...
Stereo video object segmentation is a critical technology of the new generation of video coding, video retrieval, Internet and other emerging interactive multimedia field. This paper puts forward a redundant wavelet transform based stereo video object segmentation algorithm. First, the algorithm obtains the disparity map by redundant wavelet transform and then uses the disparity map to do video object...
Summary form only given. In DCT domain distributed video coding (DVC), the uniform symmetric scalar quantization has been widely implemented, where, coefficients organized into 16 DCT bands are quantized with the given quantization levels. For each sequence has its own contents, the optimal quantization levels should vary with frames. In this paper, a low complexity algorithm for designing adaptive...
Rate-distortion optimization (RDO), in which distortion metric plays a vital role, has been proved to be an effective way in hybrid video coding. This paper proposes an improved rate-distortion optimization method based on SSIM (IRDO-SSIM) in RDO mode selection process. And the derivation of the proper multiplier to fit for the IRDO-SSIM is mainly described in this paper. Simulation results show that...
This paper proposed a novel Region of Interest (ROI) based rate control algorithm for video communication systems, in which the subjective quality of ROI can be adjusted according to users' requirements. In the proposed scheme, in order to analyze the relationship between subjective quality and encoding parameters, a structural similarity index map - quantization parameter (SSIM-QP) model is established...
Distributed Video Coding (DVC) is very different from traditional video coding structures due to its property of simple encoder and complex decoder. The generation of side information is a crucial part of DVC and has been attracting much attention, but research on the reconstruction also important for DVC is just a little. In current work, we propose a variable reconstruction scheme (VRS) by exploiting...
H.264 achieves higher compression efficiency by employing multiple modes inter prediction, rate-distortion (RD) optimal mechanism and other new techniques. Distortion metric plays an important role in video compression performance. Structural similarity (SSIM) is a new image quality assessment method, which is more consistent with Human Vision Systems (HVS). So in this paper, we propose to adopt SSIM...
In the motion estimation of H.264, the best matching blocks and the best prediction modes are chosen by Lagrange cost function whose distortion metric is the sum of absolute (transformed) differences [SA(T)D] which has similar meaning with MSE or PSNR. Recently a new image measurement called structural similarity (SSIM) based on the degradation of structural information was brought forward. It is...
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