A TU recursive fast algorithm for hevc 4K and 8K UHD encoding

Abstract

The invention discloses a TU recursive fast algorithm suitable for HEVC 4K and 8K ultra-high-definition coding. It specifically includes the following steps: calculating the encoding cost for each transform unit TU in HEVC encoding mode selection, and changing the sum of residual coefficients after quantization; calculating the texture characteristics, combined with the current block complexity that has been calculated in the pre-analysis to determine The texture characteristics of the current transformation unit TU; count the number of high-frequency coefficients after transformation; if the sum of the residual coefficients is zero or the texture characteristics are relatively simple or there are few high-frequency coefficients or the size of the current transformation unit TU is smaller than 8x8, then the current transformation unit TU Stop quadtree recursive division; otherwise, compare the encoding cost of the current transformation unit TU and the encoding costs of the 4 sub-transformation units SUBTU to select the one with the lower encoding cost, and continue to divide the quadtree downwards for the 4 sub-transformation units SUBTU until the selected Minimal encoding cost. The invention has the beneficial effects of saving coding time and ensuring subjective quality.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a TU recursive fast algorithm suitable for HEVC 4K and 8K ultra-high-definition coding. Background technique [0002] HEVC is the latest generation of video coding standard released by the International Telecommunication Union (ITU-T) in 2013. Compared with the previous generation coding standard H264, the compression efficiency of HEVC has doubled, which can greatly reduce the 4K ultra-high-definition video that is currently popularized. bit rate, reducing bandwidth consumption. [0003] 8K resolution is a digital video standard. On August 23, 2012, the International Telecommunication Union under the United Nations adopted the 7680x4320 resolution recommended by Japan's NHK TV station as the international 8K super high-definition television (SHV) standard. ", with ultra-high resolution code and ultra-clear picture quality, it has broad application prospects. [0...

AI Technical Summary

Problems solved by technology

Especially in videos where character boundaries and a large number of image backgrounds coexist, it is very easy to choose a large block of 32x32 or 16x16 as the transformation unit for general mode selection. Greatly affects subjective quality