A rate control method based on the combination of subjective region of interest and space-time domain

Abstract

The invention belongs to the technical field of HEVC (High Efficiency Video Coding), and discloses a code rate control method based on a subjective region of interest and time-space domain combination. The method comprises the following steps: calculating each CTU grade target bit allocation weight based on a space domain; calculating a motion region of each frame of image based on light streams and a global motion estimation algorithm to serve as a time domain region of interest; adjusting the obtained CTU grade target bit allocation weights according to a time domain region of interest result obtained on the basis of the light streams and the global motion estimation algorithm; performing a center enhancing operation on the CTU grade target bit allocation weights obtained through time-space domain subjective region of interest detection; obtaining final coding CTU grade target bit allocation to perform a coding operation; and modifying a video compression final evaluation standard. Compared with an HM16.0 compression model, the code rate control method has the advantages that the HEVC compression subjective effect is enhanced under the condition of ensuring that a target bit code rate is invariable.

Description

technical field [0001] The invention belongs to the technical field of HEVC high-definition video coding, and in particular relates to a code rate control method based on the combination of a subjective region of interest and a time-space domain. Background technique [0002] High Efficiency Video Coding HEVC (High Efficiency Video Coding) is the latest generation of video coding standards proposed by the JCT-VC conference. With the increasing demand for high-definition and ultra-high-definition video compression in real-life applications, the H.264 video coding standard can no longer meet the demand for high-definition video compression. Compared with the H.264 video compression coding standard, HEVC has better coding performance and will be widely used. The rate control technology is an important part of video compression coding. In practical applications, how to ensure the quality of the encoded video under limited bandwidth resources is the problem to be solved by the r...

AI Technical Summary

Problems solved by technology

[0031] To sum up, the problems existing in the existing technology are: in the code rate allocation process of HEVC coding units at all levels, less code rates are allocated to areas that the human eye does not pay attention to; the PSNR evaluation standard and the subjective evaluation observed by the human eye The difference in the results is still large, so this parameter cannot reflect the real compression quality of the video very well.

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