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Method for quickly selecting HEVC (high-efficiency video coding) inframe coding units

A coding unit and intra-frame coding technology are proposed in the field of high-performance video coding to achieve high detection accuracy, low computational complexity, and reduced time complexity.

Inactive Publication Date: 2013-02-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Method for quickly selecting HEVC (high-efficiency video coding) inframe coding units
  • Method for quickly selecting HEVC (high-efficiency video coding) inframe coding units
  • Method for quickly selecting HEVC (high-efficiency video coding) inframe coding units

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Experimental program
Comparison scheme
Effect test

Embodiment

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

[0030] Initialization steps:

[0031] Step 1: From the largest coding unit LCU to be predicted sequentially extracted in the current coding frame, start to judge the coding unit scale of the LCU from the depth corresponding to the maximum coding scale; Before encoding, and initialized to 0;

[0032] Coding unit scale judgment steps:

[0033] Step 2: Calculate the k-th coding unit of the current coding frame at the current depth i The non-normalized gradient histogram of ; judge that the coded segmentation identifier at the current depth i in the current coding frame is the number of coding units for the split split And the split identifier is the number of coding units that do not split unsplit Whether they are all greater than or equal to the preset template matching start threshold N, that is, to judge whether to meet min ( ...

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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 (HEVC) technology, and in particular relates to a technology for selecting a predictive coding unit during 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 life. Various applications of high-definition video have been welcomed and favored by users. However, the larger amount of data brought by the higher resolution makes high-definition video more demanding on the compression performance of the video codec algorithm. Current video codec 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 developing a new next-generation vid...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N19/567
Inventor 李宏亮
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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