Open AccessRate distortion model based on dual parameters Weibull distribution
Author(s) -
Hui Yan,
JinHui Tao,
Shenghong Li
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.859
Subject(s) - weibull distribution , discrete cosine transform , cauchy distribution , laplace distribution , quantization (signal processing) , probability density function , computer science , algorithm , mathematics , statistics , artificial intelligence , exponential distribution , image (mathematics)
According to analysis of discrete cosine transform DCT coefficients of video sequence, a new DCT coefficients statistical model based on Weibull probability density functionPDF is introduced. Compared with Laplacian PDF and Cauchy PDF, the model can describe properties of DCT of video sequences much better. In addition, according to the new statistical model and theory of entropy coding, the rate quantization RQ and distortion quantization DQ functions are proposed separately. Based on the simplified and approximate RQ and DQ which are obtained by the theory of rate distortion RD model and the properties of real video sequence, the novel RD model is presented. The experimental results 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.