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Lightness block selection method of intra-frame prediction mode

An intra-frame prediction mode and prediction mode technology, applied in the field of video encoding and decoding, can solve the problems of reducing real-time performance, large calculation amount, and multiple encoding time, and achieve the effect of increasing reliability, ensuring reliability, and reducing calculation amount.

Active Publication Date: 2010-12-29
HISENSE GRP HLDG CO LTD
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  • Application Information

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Problems solved by technology

[0013] It can be seen that in the above algorithm, all the intra prediction modes of the luma block need to be traversed, and the calculation of RDCost itself is relatively complicated, which leads to a very large amount of calculation and consumes too much time
Moreover, whether it is an intra-frame encoded image or an inter-frame encoded image, intra-frame prediction is required, so intra-frame prediction consumes more encoding time and reduces real-time performance.

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  • Lightness block selection method of intra-frame prediction mode
  • Lightness block selection method of intra-frame prediction mode
  • Lightness block selection method of intra-frame prediction mode

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] First, the principle of the present invention is briefly explained. The present invention utilizes the rule that in most cases, the best prediction direction of each brightness block (one-to-one correspondence with the mode) and the direction of the slowest change in average brightness in the block are the same, by determining the average brightness in the block The direction with the slowest change is used to indirectly determine the best prediction direction for the corresponding luma block.

[0042] And, on this basis, the intra prediction mode of the current block is obtained by acquiring the intra prediction modes of the adjacent blocks of the current block by utilizing the correlation between the best prediction modes between the adjacent blocks. And through the comparison of RDCost, the optimal one is selected among the intra-frame prediction modes det...

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Abstract

The invention discloses an intra-prediction mode selecting method of a luminance block. The direction in which the average luminance variation in the selected luminance block is slowest is taken as the intra-prediction mode of the luminance block. In the invention, because the direction in which the average luminance variation in the selected luminance block is slowest by calculation is taken as the intra-prediction mode of the luminance block, the amount of calculation can be greatly reduced, and the time can be saved.

Description

technical field [0001] The present invention relates to the field of video coding and decoding, in particular to a method for selecting a luma block intra-frame prediction mode. Background technique [0002] The intra-frame prediction of the AVS video codec standard takes an 8×8 block as a unit, and supports a total of 5 luma intra-frame prediction modes and 4 chrominance intra-frame prediction modes. [0003] In order to improve the compression performance of intra-frame prediction, AVS uses a full search algorithm based on RDO (Rate Distortion optimization, rate-distortion optimization) technology to calculate the RDCost (Rate Distortion cost, rate-distortion cost) of the macroblock under all intra-frame prediction mode combinations. The mode combination with the smallest RDCost is selected as the best intra prediction mode combination for the macroblock. [0004] The implementation process of the full search algorithm is as follows: [0005] 1) Perform intra-frame predi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/50H04N7/34H04N7/26H04N11/04H04N19/103H04N19/159H04N19/176
Inventor 刘微彭玉华裴雷游娜
Owner HISENSE GRP HLDG CO LTD