A coding method for improving intra-frame prediction performance

A technology of intra-frame prediction and coding method, which is applied in the field of video coding, can solve problems such as not taking into account the direction characteristics of intra-frame coding, and achieve the effects of improving video coding compression efficiency, improving prediction accuracy, and good coding performance

Active Publication Date: 2020-01-07
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

Although these coding methods can improve the compression efficiency to a certain extent, they do not take into account the directional characteristics of intra-frame coding and the correlation between reference samples.

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  • A coding method for improving intra-frame prediction performance
  • A coding method for improving intra-frame prediction performance
  • A coding method for improving intra-frame prediction performance

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Embodiment Construction

[0042]The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0043] Such as figure 1 As shown, this embodiment provides an intra-frame prediction performance-enhancing coding method, including the following steps:

[0044] Step 1: In the intra-frame angle prediction process, a mixed four-tap interpolation filter is used to generate prediction sample values, NxN prediction sample values ​​form a prediction block, and the prediction block is used for subsequent boundary filtering processing. The specific method is as follows:

[0045] 1.1) In the intra-frame...

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Abstract

The invention discloses an intraframe prediction performance improvement encoding method. According to the method, prediction sample values are generated by use of mixed four-tap interpolation filtering, including DCT-based interpolation filtering and Gauss interpolation filtering, and for different prediction unit blocks, types of used interpolation filters are determined according to a given threshold; angle prediction mode classification is performed, i.e., intraframe angle prediction modes are classified into three types for carrying out different encoding processing; and boundary prediction sample smooth filtering is performed, i.e., final encoding prediction signals are generated by filtering boundary column or boundary row samples of prediction blocks by use of pixel differences between reference samples. According to the invention, through combination of direction features of intraframe angle prediction and space correlation of the reference samples, the generation process of the prediction signals is optimized, the prediction precision is improved, and better encoding compression performance is obtained.

Description

technical field [0001] The present invention relates to a method in the technical field of video encoding, in particular to an intra-frame prediction performance improvement encoding method implemented on HEVC. Background technique [0002] With the rapid development of Internet technology, video information is widely used in digital TV, video conferencing, network communication and other occasions. It is predicted that video data will account for about 90% of the total network transmission in the future. Video carries a wealth of information. It has the advantages of intuition, efficiency, and accuracy. It has become the most important and effective way for human beings to obtain information. However, video has high redundancy and a large amount of information, which poses great challenges to network transmission and storage devices. Therefore, high-efficiency compression coding must be performed on video data, and then the compressed code stream is transmitted. [0003]...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/80H04N19/61H04N19/587
CPCH04N19/587H04N19/61H04N19/80
Inventor 解蓉魏如君宋利
Owner SHANGHAI JIAOTONG UNIV
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