Intra-frame prediction mode rapid self-adaptation selection method based on HEVC standard

Abstract

The invention discloses an intra-frame prediction mode rapid self-adaptation selection method based on an HEVC standard. The intra-frame prediction mode rapid self-adaptation selection method based on the HEVC standard comprises the steps of (1) carrying out SATD rough selection on a current prediction unit, (2) adding a prediction mode of a left side unit of the current prediction unit and a prediction mode of a front prediction unit of the current prediction unit, (3) carrying out ascending sort on SATD cost values of candidate prediction modes, (4) comparing a specific value, obtained by comparing a difference value of every two adjacent cost values and a mid-value of the cost values, and a fixed threshold value, determining a candidate prediction mode in a self-adaptation mode, and (5) selecting a prediction mode corresponding to a minimum value of an RDO cost value of the final candidate prediction mode to serve as an optimum prediction mode. The intra-frame prediction mode rapid self-adaptation selection method based on the HEVC standard mainly solves the problem that existing intra-frame mode selection of the HEVC standard is high in computation complexity. The intra-frame prediction mode rapid self-adaptation selection method based on the HEVC standard is simple in selection scheme, reduces the time for image compression by 25%-31% under the premise that image compression performance is approximately unchanged, provides the technological base for real-time realization of the HEVC standard, and can be widely applied to all the processes of intra-frame optimum prediction mode selection, based on the HEVC standard, of video compression encoding terminals.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, and relates to a method for implementing image and video compression coding, in particular to a fast adaptive selection method for an intra-frame prediction mode based on the HEVC standard, which is used for the best intra-frame prediction mode for images in the HEVC standard selection process. Background technique [0002] The processing and transmission of images and videos by computer and network technology depends on video compression. After the video signal is digitized, the bandwidth is usually above 20MB / s, which brings great challenges to computer storage and processing and network transmission. In recent years, with the continuous development of image and video acquisition terminals, the clarity and resolution of images and videos have gradually increased. Traditional video compression schemes such as H.264 / AVC can no longer meet people's needs for high-definition and...

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Problems solved by technology

[0011] The purpose of the present invention is to solve the above-mentioned shortcomings in the prior art that the selection process of the intra prediction mode is still complicated, the selection scheme of the intra prediction mode is complicated and the time complexity is high, and a kind of intra prediction mode selection is simple, and the compression process is maintained. The video image compression performance is basically unchanged, while the operation speed is improved and the processing time is greatly shortened. The fast adaptive selection method of the intra prediction mode based on the HEVC standard reduces the computational complexity of the prediction mode selection and meets the high requirements of the HEVC intra frame coding. fast performance requirements

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