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Fast selection method of hevc intra coding unit

A coding unit and intra-frame coding technology, which is applied in the field of high-performance video coding to achieve the effects of reducing time complexity, high detection accuracy, and low computational complexity

Inactive Publication Date: 2015-10-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

No attempt to solve the problem from the perspective of fast selection of coding units (CU, Coding Unit)

Method used

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  • Fast selection method of hevc intra coding unit
  • Fast selection method of hevc intra coding unit
  • Fast selection method of hevc intra coding unit

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Experimental program
Comparison scheme
Effect test

Embodiment

[0029] The present invention is implemented on the HM6.0 experimental platform, and the steps are as follows:

[0030] Initialization steps:

[0031] Step 1: In the largest coding unit LCU to be predicted sequentially extracted in the current coding frame, start the coding unit scale judgment on the LCU from the depth corresponding to the maximum coding scale; Before coding, with Initialized to 0;

[0032] Judging steps of coding unit scale:

[0033] Step 2: Calculate the k-th coding unit of the current coded frame at the current depth i Histogram of non-normalized gradients; judging the number of coded units that split the coded unit that has been coded at the current depth i in the current coded frame And the number of coding units whose split identifier is unsplit Whether all are greater than or equal to the preset template matching start threshold N, that is, it is judged whether it is satisfied min ( x pu i , x ps i ) ≥ N And max ( ...

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Abstract

The invention provides a method for quickly selecting HEVC (high-efficiency video coding) inframe coding units. Rate-distortion cost of each CU (coding unit), obtained by absolute error and SAD (sum of absolute difference) approximately, is related to non-uniformized gradient histogram of each CU. The higher the similarity degree of the non-uniformized gradient histograms of two equal-scale CUs is, the more possibly equal splitflags are. The method is a method for realizing quick selection of the CUs by utilizing the template matching mode on the basis of the non-uniformized gradient histograms, and accordingly, improving coding speed of the HEVC inframe prediction method. Whether each CU is required to be split into four smaller CUs or not is judged by utilizing the non-uniformized gradient histograms as features. On the condition of meeting template matching requirements, a step of comparing rate distortion cost of codes one by one is omitted.

Description

Technical field [0001] The present invention proposes a high-efficiency video coding (High Efficiency Video Coding, HEVC) technology, and particularly relates to a technology for selecting predictive coding units in coding. Background technique [0002] With the development and maturity of high-definition video technology, a large number of high-definition video applications have emerged in people's daily lives. Various applications of high-definition video have been welcomed and favored by users. However, the larger data volume brought about by the higher resolution makes the high-definition video require higher compression performance of the video codec algorithm. Current video coding and decoding standards (such as H.264 / AVC, etc.) often cannot well meet the compression performance requirements of high-definition video. In order to meet the requirements of new video applications for codec standards, the Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T / ISO / IEC is cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/567
Inventor 李宏亮熊健
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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