Dual Parameters Weibull Distribution-Based Rate Distortion Model

According to analysis of DCT coefficients PDF of video sequence, a new DCT coefficients statistical model based on Weibull PDF is introduced in this paper. Compared to the Laplacian PDF, the model can describe properties of DCT of video sequences much better. Besides, according to the new statistical model and theory of entropy coding, the Rate Quantization (R-Q) and Distortion Quantization (D-Q) functions are proposed separately. Based on simplified and approximate R-Q and D-Q which are obtained by the theory Rate Distortion (R-D) model and properties of real video sequence, the novel R-D model is presented. The results of experiments in this paper show that the real video sequence encoded by Intra or Inter can be described much better by using rate distortion model based on Weibull PDF.