Video constant quality control method in the mode of pyramid type bidirectional estimation

Abstract

The present invention relates to a control method for the video constant quality in a pyramid type double-way prediction mode, which belongs to the video technical field. The present invention comprises the following procedures: the first step, an initial quantization parameter to the whole video sequence is set according to the linear relationship between the peak value speech noise ratio and the quantization parameter; the second step, the quantization parameter of the time basic layer is adjusted according to the changing information of the average absolute difference among the peak value speech noise ratio of the decoded image, the decoded frame, and the reference frame; the third step, the quantization parameter of the time enhance layer is adjusted according to the changing information of the time basic layer parameter and the average absolute difference of the previous and current reference frame, to realize the control to the video constant quality in the pyramid type double-way prediction mode. The present invention can improve the consistency of the decode quality of the scalable video in a time zone, and efficiently decreases the volatility among the video frames.

Description

technical field [0001] The invention relates to a video constant quality control method in the field of video technology, in particular to a video constant quality control method in a pyramid bidirectional prediction mode. Background technique [0002] The transmission and storage of video signals usually require optimal selection of encoding and compression parameters. In the encoding process, the goal of optimization can be to aim at a constant output bit rate or to aim at a constant output quality. The former is called constant bit rate coding, which is usually realized by bit rate control, and the latter is called constant quality coding, which is usually realized by fixing quantization parameters per frame. [0003] Existing video coding standards such as H.261, H.263, H.263+, H.264 standards specified by ITU and MPEG-1, MPEG-2, MPEG-4 specified by ISO's MPEG organization are all based on Hybrid coding, which is based on the Hybrid Coding framework. The so-called hyb...

AI Technical Summary

Problems solved by technology

However, this method does not consider the impact of the interleaving of video frames at different time layers on quality fluctuations caused by the special prediction structure of pyramid bidirectional prediction, so it cannot be effectively applied to pyramid prediction structures in the time domain.

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