Statistical model of quantized DCT coefficients

In this paper we propose a two-parameter probability model of quantized DCT coefficients for image and video (i.e. JPEG&MPEG format materials), which is based on empirical observation of their statistics in the quantized DCT coefficient domain. The parameters are evaluated in terms of the maximum likelihood criterion which is applied to different frequency coefficients space. The experimental results show that quantized DCT coefficients' distribution modeled by generalized Laplacian performs better than by Laplacian.