High efficiency video coding all-zero 4*4 coefficient block early detection method

Abstract

The invention relates to a high efficiency video coding all-zero 4*4 coefficient block early detection method. The method includes the steps: 1) a quantization parameter Qp and a two-dimensional DCT transformation matrix C are set; 2) according to the Qp, the C and residual blocks in need of detection, a threshold Th1 and a threshold Th2 for all-zero block detection are calculated; 3) as for a 4*4 residual block, the corresponding detection parameter SAD is calculated; 4) the SAD is judged whether to meet SAD<Th1, if yes, the 4*4 residual block is judged to be an all-zero block, and the third step is carried out for detection on the next residual block, and if not, a fifth step is carried out; and 5) the SAD is judged whether to meet SAD<Th2, if yes, the 4*4 residual block is judged to be an all-zero block, and the third step is carried out for detection on the next residual block, and if not, DCT, quantization, inverse quantization and inverse DCT operation are carried out on the 4*4 residual block and the third step is carried out. Compared with the prior art, the high efficiency video coding all-zero 4*4 coefficient block early detection method has the advantages of being capable of improving video coding speed and reducing coding calculation complexity, high in detection efficiency and the like.

Description

technical field [0001] The invention relates to a video coding method, in particular to a high-efficiency video coding all-zero 4*4 coefficient block early detection method. Background technique [0002] With people's ever-increasing demand for multimedia entertainment, the popularity of high-definition video and the emergence of ultra-high-definition video have led to higher requirements for coding efficiency, which cannot be met by the current video coding standard H.264 / AVC . To this end, the Joint Video Coding Team (JCT-VC) designed a new video coding standard called High Efficiency Video Coding (HEVC), which aims to provide higher than H .264 / AVC twice the compression efficiency. [0003] The basic difference between HEVC and other video coding standards is that HEVC uses a quadtree structure. The quadtree structure is a mechanism for dividing a picture into blocks of different sizes, which can improve the performance of prediction and residual coding. The basic pro...

AI Technical Summary

Problems solved by technology

[0004] Although the compression efficiency of HEVC has been greatly improved, its computational complexity has also become extremely large

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