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In this paper, we propose a new error concealment algorithm for video/image based on canonical correlation analysis (CCA). Motivated by the Intra prediction in H.264/AVC, it is reasonable to assume that there is a strong spatial correlation relationship between the lost regions and their known adjacent regions. Based on the above idea, we use CCA to estimate a correlation projection matrix which utilizes...
Spatial resolution reduction of compressed video is highly desirable in video transcoding. Many studies have addressed this problem, but they either cause drift error or have high computation complexity. A new spatial downsampling algorithm for DCT-Domain video transcoder is proposed in this paper, in which L??M sub-blocks of N??N are combined into a L??N rows and M??N columns blocks in DCT-Domain...
In this thesis, in the foundation of overview the present research situation of encryption algorithm, research on the concrete realization of MPEG video encryption algorithm and the transplantation of DM642, the main research contents are as follows: in simplifies to MPEG-4 VISUAL XviD source code, in the foundation of which we design and implement the representative VEA algorithm and the entropy...
Motivated by the wide adoption of H.264 and the demand of universal multimedia data access over wireless network , this paper studies H.264 homogeneous video transcoding with spatial resolution conversion. Firstly , we propose a fast video transcoder ,working entirely in the DCT-domain,to convert high quality H.264 bitstream into low bit rate stream with low spatial resolution for wireless video access...
In this paper, we develop an improved error concealment scheme for entire frame loss of H.264/AVC by using variable-size block motion vector extrapolation. At first, the proposed algorithm extrapolates MVs from available neighboring frames onto the lost frame and determines the MV of each 8times8 block, for those blocks with dissimilar candidate MVs, they are divided into four sub-blocks and an re-estimation...
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