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Intra prediction method, system and computer readable storage medium

A technology for intra-frame prediction and direction prediction, which is applied in the field of video coding, and can solve problems such as high computational complexity of fast algorithms and difficulty in realizing real-time intra-frame prediction.

Active Publication Date: 2020-12-01
湖南长城银河科技有限公司
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Problems solved by technology

The above method has achieved a certain acceleration effect of intra-frame prediction, but the computational complexity of its fast algorithm itself is still relatively large, and it is difficult to achieve real-time intra-frame prediction

Method used

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  • Intra prediction method, system and computer readable storage medium
  • Intra prediction method, system and computer readable storage medium
  • Intra prediction method, system and computer readable storage medium

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Embodiment Construction

[0045] The basic method of the present invention is to use the original image pixel value to directly calculate the prediction-related feature value of each sub-block, select and determine the candidate prediction mode subset of each sub-block based on the feature value, and finally use the RDO mechanism to select the best candidate mode subset from the candidate mode subset. predictive mode. The present invention includes the following contents:

[0046] Calculate the prediction-related features of each 4x4 sub-block based on the original pixels of the coded image. The calculation method is: firstly use the 4x4 sub-block and its left, upper and upper left adjacent pixels to construct a 5x5 pixel value matrix, such as figure 1 shown; then calculate the sum SUM of the original pixel gray value of the 4x4 sub-block 4x4 , and SUM_L of the gray values ​​of adjacent pixels on the left 1x4 , and SUM_T of the gray value of the adjacent pixels above 4x1 ;Finally calculate the predi...

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Abstract

The invention discloses an intra-frame prediction method and system and a computer readable storage medium. The method comprises: calculating sub-block prediction related characteristic values based on the original pixel values of the sub-blocks with different sizes and the original pixel values of the adjacent pixels on the left side, the upper side and the upper left side of the sub-blocks, determining a minimum candidate mode set based on the sub-block prediction related characteristic values, and finally calculating and judging the optimal intra-frame prediction mode of the sub-blocks. According to the method, the minimum candidate mode set of H.265 intra-frame prediction can be accurately and quickly decided, and only a few candidate prediction modes of each sub-block are selected, sothat the mode selection time is shortened, and the speed of an intra-frame prediction algorithm is increased.

Description

technical field [0001] The present invention relates to video coding technology, in particular to an intra-frame prediction method, system and computer-readable storage medium. Background technique [0002] Video data has the characteristics of large data volume and high correlation, so it must be compressed by video coding technology. With the continuous development of communication technology and multimedia technology, people's demand for video applications is increasing, and video applications show the characteristics of higher and higher definition and higher frame rate, which further puts forward requirements on video compression rate. higher requirement. In this context, the Joint Collaborative Team on Video Coding (JCT-VC) proposed the H.265 standard. Under the technical framework of the original H.264 standard, various codec algorithms were further expanded and innovated. Compared with H.264, H.265 can double the compression rate with the same reconstructed image q...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/159H04N19/176H04N19/70
CPCH04N19/159H04N19/176H04N19/70
Inventor 刘宗林刘蓬侠罗恒王磊艾明哲伍玉良易雨农胡志文何志强陈东泽黄浩逸贺维佳徐喆陈奕军龙刘靖
Owner 湖南长城银河科技有限公司
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