coding step
1.By using modified block truncation coding and motion compensation technique based on one-step predictive motion estimation,the proposed codec can compress real-time videophone pictures below the bit-rate of 100 kbps on current PC.
4.In addition, a novel method was presented and studied to fabricate the integrated diffractive element of BSG and CSG with the gray-tone coding mask. With this method, the multifunction DOE can be achieved through only one-step lithography, which greatly simples the fabrication process and reduces the cost.
6.To pick up the convergence speed of traditional genetic algorithm, a modified genetic algorithm is presented, which is based on subsection integer coding, combining stable-state selection strategy with inequality individual and scaling, adaptive recombination according to gene sufficiency, self-adaptive variable step and multi-gene mutation.
8.Then will introduce the holistic flow of H.26L and the new ideas: researching the MV (motion vector) with higher levels of spatial accuracy、integer DCT Transform、quantization which the step sizes are increased at compounding rate of approximately 12.5%、intra prediction and coding and inter predication and coding.
9.The efficiency problem of removing correlation and energy compression in orthogonal transform coding image is studied and discussed. First, with the first -order Markov process used as correlation computation model, the various orthogonal transforms are considered with efficiency of both removing correlation and energy compression. Secondly, step signal considered as the model of image edge signals is used to research compression efficiency of image energy.
