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Optimal Intra-Frame Video Coding Method Based on Video Texture Information

A video texture and video coding technology, which is applied in digital video signal modification, image communication, electrical components, etc., can solve the problems of complex calculation and low optimization of the search table method, and avoid coding prediction calculation, improve speed, and calculation process simplified effect

Inactive Publication Date: 2017-08-15
SHANGHAI JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

The search table method is computationally complex and has low optimization, and this existing technology only corrects the depth division

Method used

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  • Optimal Intra-Frame Video Coding Method Based on Video Texture Information
  • Optimal Intra-Frame Video Coding Method Based on Video Texture Information
  • Optimal Intra-Frame Video Coding Method Based on Video Texture Information

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Experimental program
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Embodiment 1

[0022] Such as figure 1 As shown, this embodiment includes the following steps:

[0023] Step 1. Gradient calculation is performed on all pixels of the intra-frame coding frame, that is, the I frame, to obtain a gradient value representing the direction of motion of the pixel; by comparing the relationship between the intra-frame prediction direction map and the gradient, the gradient and the prediction mode mapping relationship diagram are obtained, thereby The optimal prediction mode for each pixel is obtained during the encoding process.

[0024] In order to ensure the accuracy of prediction, HEVC introduces a large number of intra-frame prediction directions. For example, the brightness module in HEVC uses 33 directional prediction modes and two special prediction modes (DC, planar), and AVS2 uses 30 directions. The directional prediction mode and three special prediction modes (DC, plane, bilinear), the above gradient value and the intra prediction directional mode in HE...

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Abstract

An optimized intra-frame video coding method based on video texture information in the field of video coding. Through the calculation and mapping of I-frame gradient information, the video image gradient information and its actual meaning are used to calculate all pixels of the intra-frame coding frame, and for high-efficiency video The intra prediction mode is used for mapping; the coding unit is divided, and the attribute of the coding unit is determined according to the gradient information of the pixels in the current coding unit, and the attribute and direction consistency of the four smaller coding units included in the larger coding unit are determined from bottom to top The division method skips unnecessary division traversal; the fast mode selection adopts the offline training method to predict and optimize the prediction mode selection under different coding unit attribute conditions. The invention optimizes the mode selection and coding unit division of the intra-frame video coding in combination with the texture characteristics of the video, improves the coding speed under the premise of ensuring the coding quality, and ensures the stability of the algorithm for coding different video sequences.

Description

technical field [0001] The present invention relates to an intra-frame video coding method in the technical field of video coding, in particular to an optimized intra-frame video coding method based on video texture information. Background technique [0002] Video coding technology is to compress and convert video into video code stream through certain technology according to compression standard. At present, for different video application fields and technology development, there are many video coding standards, mainly MPEG-x series and H.26x series, such as MPEG-2, MPEG-4 standards, H.263, H.264 standards, etc. , In addition, there is the audio and video coding standard AVS formulated by the domestic digital audio and video coding and decoding technology standard working group. With the development of multimedia, people's demand for 3D, high-definition, ultra-high-definition and other videos has increased. Followed by higher requirements for video coding efficiency, HEVC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/103H04N19/50
Inventor 解蓉陈航张良张文军
Owner SHANGHAI JIAOTONG UNIV
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