Intraframe video encoding optimization method based on video texture information

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

Inactive Publication Date: 2015-07-22
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The search table method is computationally complex and has low optimi

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  • Intraframe video encoding optimization method based on video texture information
  • Intraframe video encoding optimization method based on video texture information
  • Intraframe video encoding optimization method based on video texture information

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Example Embodiment

[0021] Example 1

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

[0023] Step 1. Perform gradient calculation on the intra-frame coded frame, that is, all pixels in the I frame, to obtain the gradient value representing the direction of the pixel movement; compare the relationship between the intra-frame prediction direction map and the gradient to obtain the gradient and the prediction mode mapping relationship, thereby In the encoding process, the optimal prediction mode of each pixel is obtained.

[0024] In order to ensure the accuracy of prediction, HEVC introduces a large number of intra 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. There is a one-to-one mapping relationship between the specific prediction mode and three special prediction modes (DC, plane, and bilinear).

[0025] Step 2: Analyze and determine th...

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Abstract

Disclosed is an intraframe video encoding optimization method based on video texture information. The method includes by means of I frame gradient information calculation and mapping, utilizing the video gradient information and actual meaning thereof to calculate all pixels of the intraframe encoding frames, and mapping according to an efficient video intraframe predicting mode; segmenting encoding units, judging the attributes of the encoding units according to the gradient information of the pixels of the current encoding unit, determining the segmenting manner according to the attributes of four smaller encoding units contained by large encoding units and direction consistence from bottom to top, and omitting unnecessary traverse segmentation; performing fast mode selection, adopting the offline training manner, and predicting and optimizing the mode selection and encoding unit segmentation. The encoding speed is increased on the premise of guaranteeing the encoding quality, and guaranteeing the stability of encoding of 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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IPC IPC(8): H04N19/103H04N19/50
Inventor 解蓉陈航张良张文军
Owner SHANGHAI JIAO TONG UNIV
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