AVS VIDEO COMPRESSING AND CODING METHOD, AND CODER

摘要

Disclosed are an AVS video compressing and coding method, and a coder. An initial weight and quantization coefficient of each frequency band in a quantization matrix is adjusted by mainly using a calculated average brightness value of an image to be coded and an average transform coefficient of each frequency band, so as to obtain a quantized final weight and quantization coefficient; and transform coefficients of different frequency points obtained by means of transforms are quantized in different steps by using the quantization matrix formed by the quantized final weight and quantization coefficients. In this way, attributes of an image to be coded are fully considered in a quantization process, and the weight and quantization coefficients in the quantization matrix is adaptively adjusted, thereby effectively reducing the coding rate while the video coding quality is ensured.