Intra-frame prediction mode rapid self-adaptation selection method based on HEVC standard
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An intra-frame prediction mode and adaptive selection technology, which is applied in the fields of television, electrical components, image communication, etc., can solve the complex time complexity of the intra-frame prediction mode selection scheme, shorten the processing time, and reduce the calculation complexity of the prediction mode selection, etc. question
Inactive Publication Date: 2013-09-25
XIDIAN UNIV
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[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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Embodiment 1
[0038] The present invention is a fast adaptive selection method for intra-frame prediction mode based on the HEVC standard, which is an improvement to the existing intra-frame prediction mode selection technology in the encoding scheme that meets the requirements of the HEVC standard, and can keep performance basically unchanged. , reduce the compression time by 28% to 31%.
[0039] refer to figure 1 , the present invention realizes the fast self-adaptive selection of the intra prediction mode of the encoding scheme satisfying the HEVC standard, and the implementation method includes the following steps:
[0040] Step 1), block a frame of image in the video signal to be processed as the basic processing unit, and the basic processing unit is further divided into image blocks of 64×64, 32×32, 16×16, 8×8 or 4×4 , select one of the image blocks as the prediction unit.
[0041] Step 2), through the SATD-based cost function, calculate the cost value SatdCost of the selected pred...
Embodiment 2
[0072] The method for fast adaptive selection of an intra prediction mode based on the HEVC standard is the same as that in Embodiment 1.
[0073] refer to figure 1 , the present invention realizes the fast adaptive selection of the intra prediction mode based on the HEVC standard, and the implementation method includes the following steps:
[0074] Step 1), block a frame of image in the video signal to be processed as the basic processing unit, and the basic processing unit is further divided into image blocks of 64×64, 32×32, 16×16, 8×8 or 4×4 , select one of the image blocks 16×16 as the prediction unit, I(i, j) is the original pixel value of the current prediction unit at (i, j), (i, j) represents the coordinates of the prediction unit pixel, and the origin of the coordinates is at top left.
[0075]
[0076] Step 2), through the SATD-based cost function, calculate the cost value SatdCost of the selected prediction unit under the 35 prediction modes in the HEVC standa...
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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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