Intra mode selection method for skipping large-size CU

A technology of mode selection and size, applied in the field of video processing, can solve the problems of long encoding time and large amount of calculation, and achieve the effect of saving encoding time and speeding up encoding.

Pending Publication Date: 2022-03-25
HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of Intra mode selection in the prior art, which has a large amount of calculation and long encoding time, and provides an Intra mode selection method and system for skipping large-size CUs

Method used

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  • Intra mode selection method for skipping large-size CU
  • Intra mode selection method for skipping large-size CU
  • Intra mode selection method for skipping large-size CU

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In the prior art, methods for selecting the Intra mode include:

[0051] Step 1, the Intra mode selection of a CU in the I frame starts;

[0052] Step 2, do the prediction of the current Intra mode,

[0053] Step 3, calculate the Sad of the difference between the predicted value and the pixel value of this CU, and put it into a list of Sad; all Intra modes are completed, and then execute step 4, otherwise return to step 2;

[0054] Step 4. Arrange all the values ​​in the Sad list in ascending order. Take the first N Intra modes and use a more accurate and more computationally intensive method to select an optimal Intra mode as the mode selection result of this CU. This CU has a multi-sub-CU division mode specified in the standard, and the Intra mode of one CU in an I frame Select End.

Embodiment 2

[0056] The difference from Embodiment 1 is that this embodiment provides an Intra mode selection method that skips a large-size CU, which is applied to an I frame of a VVC encoder, and the method includes:

[0057] S1, judge the height or width of the CU, if the height or width is greater than 64, execute S3, otherwise execute S2;

[0058] S2, judge the height or width of the CU, when the height or width is greater than 32, and the Qp is less than the first Qp threshold; then execute S3, otherwise execute S6;

[0059]S3, calculate the variance value Var between CU pixels; and judge the variance value, when Var is smaller than the variance threshold VarThr; then execute S4, otherwise execute S11;

[0060] S4. Predict the CU in at least three directions, and determine the sad value of each direction according to the predicted value of each direction prediction and each pixel value, put the sad value of each direction into the Sad list, and determine the minimum predicted value ...

Embodiment 3

[0087] On the basis of Embodiment 2, the difference from Embodiment 2 is that this embodiment replaces vertical mode prediction with vertically adjacent direction prediction, such as Intra_ANGULAR49 or NTRA_ANGULAR51; horizontal mode prediction is replaced with horizontally adjacent Either direction forecast, such as NTRA_ANGULAR17 or NTRA_ANGULAR19.

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Abstract

The invention relates to a video processing technology, and discloses an Intra mode selection method for skipping a large-size CU (Control Unit), which is applied to an I frame of a VVC (Video Video Coding) encoder and is used for carrying out rapid Intra mode selection and division type selection on the CU of which the height or width is greater than 32. According to the method, the coding speed of the I frame is increased while the coding quality is not lost. According to the invention, the coding time of the I frame in the VVC encoder is saved by about 15% under the condition of medium and high bit rate coding and without reducing the compression efficiency, and meanwhile, the coding time of the I frame in the VVC encoder is saved by about 5% under the low bit rate.

Description

technical field [0001] The present invention relates to video processing technology, in particular to an Intra mode selection method for skipping large-size CUs applied to I frames of a VVC encoder. Background technique [0002] In the latest video compression standard VVC published by the MPEG organization in 2020, in order to improve compression efficiency, it supports multiple division modes, increasing from one in HEVC to five, but at the same time it leads to encoding a block with a width of 128 and a height of 128 It needs to traverse millions of CU coding units, and the Intra mode intra-frame coding mode has increased to 67 modes, which seriously increases the coding time. It takes several minutes to compile an image with an I frame width of 1920 and a height of 1080. For real-time Encoded scenarios, such as ingestion systems, are unacceptable. [0003] For example, in the prior art, the patent application number is: CN201711481714.9; the patent name is, CU division ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/182H04N19/20
CPCH04N19/182H04N19/20
Inventor 万俊青王建伟吴志强孙彦龙
Owner HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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