High efficiency video coding (HEVC) intraframe coding method, device and system based on texture direction

Abstract

The invention discloses a high efficiency video coding (HEVC) intraframe coding method, device and system based on a texture direction. The method comprises the steps of segmenting every frame of image into maximum coding units (CUs), enabling depth values of the maximum CUs to be set as 0; obtaining a depth value of a current CU; when the depth value is smaller than a depth threshold, calculating texture direction signs of the current CU, judging whether a texture type of the current CU is flat or directional, and if the texture type of the current CU is not flat or directional, segmenting the current CU, and adding 1 to the depth value of the current CU; when the depth value reaches the depth threshold, calculating texture direction signs of a prediction unit (PU); selecting a candidate mode set of prediction modes according to the texture direction signs of the CU and / or the PU, and determining an optimum prediction mode from the candidate mode set to perform coding. According to the HEVC intraframe coding method, device and system based on the texture direction, CU layer block segmentation optimization and PU layer prediction mode optimization are performed through texture direction signs of coding blocks, and accordingly coding complexity and coding time are greatly reduced.

Description

technical field [0001] The present invention relates to the technical field of video coding and decoding, and in particular to a texture direction-based HEVC (High Efficiency Video Coding, high-efficiency video coding) intra-frame coding method, device and system. Background technique [0002] HEVC is a new generation of video compression standard formulated by the International Standards Organization ISO / IEC and ITU-T. Its core goal is to double the compression efficiency on the basis of H.264 / AVC, that is, to ensure the same video image quality. Under the premise, the bit rate of the video stream is reduced by 50%. [0003] HEVC inherits the classic block-based hybrid coding model since H.261. In order to compress high-resolution video more effectively, HEVC proposes three more flexible video content representation units, including: CU (coding unit, coding unit), PU (prediction unit, prediction unit) and TU ( transform unit, transform unit). CU is similar to the concept...

AI Technical Summary

Problems solved by technology

However, these methods optimize the HEVC intra-frame prediction coding at the PU layer and the CU layer respectively. The optimization of the PU layer and the CU layer is independent and not integrated together, which is still very complicated.

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