Rapid HEVC intra-frame prediction coding method

A technology of intra-frame predictive coding and intra-frame predictive mode, which is applied in the field of video coding, can solve the problems of not calculating the cost of predictive mode coding, large amount of calculation, etc., to save coding time, reduce complexity, and reduce the loss of coding quality. Effect

Active Publication Date: 2018-01-19
HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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AI Technical Summary

Problems solved by technology

HM and x265 do not calculate the encoding cost of each prediction mode, because the amount of calculation is too large

Method used

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  • Rapid HEVC intra-frame prediction coding method
  • Rapid HEVC intra-frame prediction coding method
  • Rapid HEVC intra-frame prediction coding method

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[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] A fast HEVC intra-frame predictive encoding method specifically comprises the following steps:

[0026] (1) For intra-frame prediction mode selection for 32x32CU, when calculating 35 prediction modes SatdCost, it is necessary to calculate the Satd value of all 33 prediction directions; and 32x32CU is divided into four 16x16 sub-CUs, which are 16SubCU0 placed in the upper left corner, set 16SubCU1 in the upper right corner, 16SubCU2 in the lower left corner, and 16SubCU3 in the lower right corner; the Satd value is obtained by calculating the Satd values ​​of four 16x16 sub-blocks respectively and then summing them up, and recording 33 of 16SubCU0, 16SubCU1, 16SubCU2 and 16SubCU3 The Satd values ​​corresponding to the prediction directions; among them, the 33 prediction directions are the prediction directions 2 to 34 respectively, such a...

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Abstract

The invention discloses a rapid HEVC intra-frame prediction coding method. In HEVC reference software HM and an open source encoder X265, firstly, the intra-frame prediction coding cost of the currentCU is calculated, and then the intra-frame prediction coding cost of the four sub-CUs is calculated, and finally, the sum of the cost of the sub-CUs and the current CU is used for carrying out PK toselect the segmentation mode of the CU, the sub-CUs coding cost calculation and the current CU calculation process are not related, namely, the sub-CUs also need to calculate the SatdCost in 35 prediction modes and the coding cost in N modes from the beginning, but actually the sub-CUs and the current CU are in an included relationship, and the intermediate calculation result of the current CU inthe optimal intra-frame prediction mode selection process can be used for the sub-CUs. The method has the beneficial effects that the selection process of the intra-frame prediction direction of the sub-blocks is accelerated by utilizing the coding result of the big block, the compression efficiency is basically not lost while the complexity is remarkably reduced, and the method can be applied tothe optimization of an actual HEVC encoder.

Description

technical field [0001] The present invention relates to the related technical field of video coding, in particular to a fast HEVC intra-frame predictive coding method. Background technique [0002] HEVC is the latest generation of video coding standard, which doubles the compression efficiency based on H264. Unlike H264, which uses a macroblock as a unit of coding architecture, HEVC proposes a new coding framework for coding units (Coding Unit, CU) and prediction units (Prediction Unit, PU). The maximum coding unit is 64x64, and the minimum is 8x8. The CU can be recursively divided into four sub-CUs using a quadtree, and the CU can be divided into prediction units (PUs) of different shapes. Therefore, HEVC coding blocks are more flexible than H264. There are more blocks and more types of blocks, and the encoder can select the coding unit and prediction unit with the highest compression efficiency according to the actual scene. [0003] HEVC uses the rate-distortion optimiz...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/176H04N19/593H04N19/70H04N19/11
Inventor 李日万俊青朱建国
Owner HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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