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In this paper, we introduce a novel block-based multiscale error concealment method using low-rank completion. The proposed method searches for similar blocks and utilizes low-rank completion to recover the missing pixels. In order to make the full use of the hidden redundant information of images, we seek for more similar blocks by building an image pyramid. The blocks collected from the pyramid...
This paper studies the rate-distortion (R-D) performance of entropy-constrained dead-zone plus uniform threshold scalar quantization (DZ+UTSQ) and nearly-uniform reconstruction quantization (NURQ) for generalized Gaussian distribution (GGD). We first derive the preliminary constraint of R-D optimized DZ+UTSQ/NURQ for GGD. Then for GGD source of actual DCT coefficients, the refined constraint and precise...
Rate-distortion optimization (RDO) technique is widely employed by H.264/AVC for the purpose of determining the best mode. However, such technique results in dramatic increase in the computation complexity of the underlying encoder. In this paper, we address this problem by presenting an efficient intra-4x4 mode decision algorithm. The algorithm works by approximating the bit-rate so as to reduce...
A robust video watermarking scheme resilient to spatial desynchronization and photometric distortion is presented. The scheme is based on geometrically approximate invariant watermarking and adaptive watermarking, and it embeds watermark by modifying middle frequency component adaptively according to persistence of vision and Watson's DCT based visual model. Experimental results show that the proposed...
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