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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...
This paper proposes a new data hiding scheme based on covering code in process of producing halftone images. The scheme is mainly to do error diffusion in gray-level images beforehand, and produce the fixed length sequence of the halftoning binary code according to the rule of covering code. Then, after embedding secret data in the binary code, the gray-level images renew to do the error diffusion...
Video image compression has been an area where the computational demand is far above the capacity of conventional sequential processing. In this paper, we present a parallel motion estimation model for video sequence compression using distributed computing on a local network. The approach proposed is the decomposition of functions and data on a cluster of workstations using MPI mechanism. Parallel...
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