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The high compression ratio of fractal encoding is based on the increasing of the computation complexity. In order to meet the application requirements of real-time sharing and transmission, it is becoming an important research area to advance the encoding speed by developing the parallelization algorithm based on multi-core programming. In this paper, the OpenMP program model is applied to parallelize...
Abstract--This article is based on H.264/AVC video coding standard, including analysis of the current UMHexagonS algorithm processes and problems, Optimization of the entire pixel search algorithm UMHexagonS and an improved sub-pixel search algorithm, and gives the improved UMHexagonS algorithm process ,describes its advantages. Experimental results show the improved efficiency of the algorithm, practical...
During the work of multispectral images, compressed image quality maybe descend or even not decoded because of wireless transmission electromagnetism interference. According to the characteristics of multispectral images, the performance of image wireless transfers channel, and the interior structure on JPEG2000 wireless image compression criterion, Unequal Error Protection scheme is put forward under...
We present a novel approach to address the representation issue and the matching issue in face recognition (verification). Firstly, our approach encodes the micro-structures of the face by a new learning-based encoding method. Unlike many previous manually designed encoding methods (e.g., LBP or SIFT), we use unsupervised learning techniques to learn an encoder from the training examples, which can...
Intra-prediction is an important feature in H.264/AVC video coding standard, which raises the compression ratio, but increases the computing complexity as well. Based on the analysis of the features of Intra_4 ×4 and Intra_16 ×16, a threshold and Integer Transform is proposed to save computation. Then, the algorithm for intra-prediction mode decision is modified. The experimental results show that...
This paper proposes a novel error concealment method based on the scene change in H.264. An effective scene change detection mechanism is adopted firstly in this method to detect the scene change. Temporal error concealment is chosen when the temporal redundancy is greater than the spatial redundancy. Otherwise, spatial error concealment is chosen. This method improves the original method of error...
Multi-pixel encoding is an emerging method in visual cryptography for that it can encode more than one pixel for each run. However, in fact its encoding efficiency is still low. This paper presents a novel multi-pixel encoding which can encode variable number of pixels for each run. The length of encoding at one run is equal to the number of the consecutive same pixels met during scanning the secret...
The computational complexity and hardware design of block-matching criteria were discussed, and a novel MPDC algorithm and its VLSI structure for H.264 were presented, in which a QP adaptive MPDC threshold was derived from the basics of H.264 4??4 integer transform and 52-level scalar quantization and the calculation process was adjusted for hardware optimization. When QP is greater than 18, the proposed...
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