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Method and device for quickly selecting HEVC intra prediction mode on basis of texture characteristics

An intra-frame prediction mode and prediction mode technology, applied in the field of video coding and decoding, can solve the problem of mode search volume and mode selection efficiency, etc., and achieve the effect of reducing the number of searches, reducing the calculation time, and improving the mode selection speed.

Active Publication Date: 2014-12-31
TSINGHUA UNIV
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Excessive mode search volume makes the mode selection efficiency of the whole coding system inefficient

Method used

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  • Method and device for quickly selecting HEVC intra prediction mode on basis of texture characteristics
  • Method and device for quickly selecting HEVC intra prediction mode on basis of texture characteristics
  • Method and device for quickly selecting HEVC intra prediction mode on basis of texture characteristics

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Embodiment 1

[0044] The present invention proposes a method for fast selection of an HEVC intra-frame prediction mode based on texture characteristics, the method comprising:

[0045] A: Determine the magnitude and direction of each element in the edge texture map of the unit to be predicted PU;

[0046] B: Make statistics on the direction and generate a statistical histogram of texture direction;

[0047] C: Determine the strong texture direction of the PU, and when the PU has a strong texture direction and matches the prediction mode direction of any adjacent block, use the mode corresponding to the strong texture direction as the final prediction mode;

[0048] The strong texture direction is the direction when the ratio of the amplitude energy of the PU in any direction to the total energy of the total amplitude of all directions in the texture direction statistical histogram is greater than a preset threshold.

[0049] Preferably, in step A, the direction of each element in the edge ...

Embodiment 2

[0063] The present invention also proposes a method for quickly selecting HEVC intra-frame prediction modes based on texture characteristics more specifically, and the overall flow of its algorithm implementation is as follows: figure 2 . Specifically, it includes: texture amplitude calculation and direction determination, texture direction statistical histogram generation, strong texture direction determination, generation of minimum search direction set, and pattern discarding based on SATD value and other sub-processes. These processes can be directly embedded in the original HEVC intra-frame prediction processing flow, without changing the program codes of the protocol's original standard processes such as rough selection and fine selection. The algorithm uses a 2×2 filter to calculate the edge texture map of the block to be predicted. The details of each sub-process of the algorithm are described below.

[0064] Texture amplitude calculation and direction determination ...

Embodiment 3

[0114] The present invention also proposes a device for quickly selecting an HEVC intra-frame prediction mode based on texture characteristics, and the device includes:

[0115] A texture magnitude calculation and direction determination module, configured to calculate the magnitude of each element in the edge texture map of the unit to be predicted PU and determine the direction of each element in the edge texture map of the PU;

[0116] A texture direction statistical histogram generating module, configured to generate a texture direction statistical histogram according to the statistics of the directions;

[0117] A strong texture direction determination module, configured to determine whether the PU has a strong texture direction and whether the strong texture direction matches the prediction mode direction of any adjacent block;

[0118] When the PU has a strong texture direction and matches the prediction mode direction of any adjacent block, use the mode corresponding t...

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Abstract

The invention provides a method and a device for quickly selecting high efficiency video coding (HEVC) intra prediction mode on basis of texture characteristics. A texture direction statistical histogram is generated by determining the texture amplitude and the texture direction of each element of an edge texture figure of a to-be-predicted unit (PU), so that the strong texture direction of the PU is judged; and when the PU has the strong texture direction which is matched with a prediction mode direction of any adjacent module, the strong texture direction serves as the final prediction mode direction. By the method and the device, the search times are reduced, the calculation time of mode selection is effectively reduced and the speed of mode selection is obviously increased on the premise of guaranteeing the coding quality.

Description

technical field [0001] The present invention relates to the technical field of video encoding and decoding, in particular to a method and device for quickly selecting an HEVC intra prediction mode based on texture characteristics. Background technique [0002] The HEVC (High Efficiency Video Coding) protocol aims to provide a high-resolution video coding and decoding technology with a higher compression rate than the current H.264 protocol and without a significant increase in computational complexity. HEVC proposes three more efficient and flexible video content representation units, including: coding unit (coding unit, CU), prediction unit (prediction unit, PU), and transmission unit (transform unit, TU). Among them, the PU has five sizes: the smallest 4×4 and the largest 64×64. In order to adapt to changes in PU units and improve prediction accuracy, HEVC introduces an intra prediction method (Arbitrary Direction Intra, ADI). The method defines as many as 35 intra-frame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/11H04N19/54
Inventor 刘振宇陈光汪东升
Owner TSINGHUA UNIV
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