A method to quickly skip the intra prediction mode of P and B frames in HEVC

A technology of intra-frame prediction mode and inter-frame prediction mode, applied in the field of video coding, can solve problems such as low ratio, and achieve the effect of reducing coding time and saving coding time

Active Publication Date: 2020-04-07
HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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Problems solved by technology

However, in general, most coding units can find matching blocks in adjacent frames in the time domain, so the proportion of intra-frame prediction selection in P and B frames is relatively low

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  • A method to quickly skip the intra prediction mode of P and B frames in HEVC

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Embodiment Construction

[0026] The present invention will be further described below in combination with specific embodiments.

[0027] A method for quickly skipping P and B frame intra-frame prediction modes in HEVC, specifically comprising the following steps:

[0028] (1) For the coding units of P and B frames, first calculate the coding costs of all inter-frame prediction modes according to the normal coding process, and select the inter-frame prediction mode with the smallest cost as the optimal inter-frame prediction mode, which is P_best_inter; After the encoding cost process, the predicted value and the number of coded bits of the prediction unit are saved. The predicted image of the luminance component of the optimal prediction unit is Prd_best_inter, and the number of coded bits is bits_best_inter;

[0029](2) Perform 1 / 4 downsampling on both the predicted image and the original image of the optimal inter-frame prediction mode P_best_inter, and then calculate SatdCost to obtain SatdCost_int...

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Abstract

The invention discloses a method for quickly skipping intra-frame prediction modes of P and B frames in HEVC. The method comprises the following steps of for the coding units of P and B frames, calculating the coding cost of all inter-frame prediction modes, selecting the inter-frame prediction mode with the minimum cost as the optimal inter-frame prediction mode; performing the 1 / 4 down-samplingon the prediction image in the optimal inter-frame prediction mode and the original image, and calculating to obtain the SatdCost_inter_ds; acquiring the adjacent pixels of the intra-frame predictionunit to carry out the 1 / 4 down-sampling, and then obtaining the prediction images in 11 intra-frame prediction modes, and calculating the original images after being subjected to the 1 / 4 down-samplingto select the minimum SadCost_intra_ds; and finally, selecting an optimal prediction mode. The method has the advantages that the coding time is remarkably shortened, the coding quality is not lost,the average code rate is not increased, and the coding time is averagely saved by 9. 8%.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a method for quickly skipping P and B frame intra-frame prediction modes in HEVC. Background technique [0002] HEVC is the latest generation of video coding standard. Compared with H264, the compression efficiency can be doubled. HEVC uses many complex technologies to improve the compression rate. Specifically (1), HEVC uses a quadtree block method. Each block is called a coding unit (Coding Unit, CU). The largest CU It can be up to 64x64, each CU can be recursively divided into four sub-CUs, and the smallest CU can be up to 8x8, so the block division method of HEVC is more flexible than that of H264, and there are more types of blocks. (2), HEVC can try more prediction modes for each CU, each prediction mode corresponds to a prediction unit (Prediction Unit), there are two types of prediction modes, inter prediction mode (including Merge&Skip_2Nx2N, Inter_2Nx2N, I...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/109H04N19/132H04N19/11H04N19/577
Inventor 李日万俊青朱建国
Owner HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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