INTRA-PREDICTION MODE SCREENING METHOD AND APPARATUS FOR VIDEO FRAME

Disclosed in the present application is a texture-analysis-based intra-prediction mode screening method for a video frame. The method comprises: calculating image texture of a video frame, so as to obtain a gradient vector of each pixel point in the video frame; classifying the gradient vectors of a...

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Bibliographische Detailangaben
Hauptverfasser: LIU, Pengfei, WEN, Anjun, LIU, Guozheng
Format: Patent
Sprache:chi ; eng ; fre
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Zusammenfassung:Disclosed in the present application is a texture-analysis-based intra-prediction mode screening method for a video frame. The method comprises: calculating image texture of a video frame, so as to obtain a gradient vector of each pixel point in the video frame; classifying the gradient vectors of all the pixel points into two parts according to directions, respectively performing first mapping in the different directions, and then performing second mapping in the same direction, such that the gradient vector of each pixel point is converted into a vector, which represents an optimal prediction direction, of the pixel point, and the directions of the vectors, which represent the optimal prediction directions, of all the pixel points are distributed within a 180-degree angular range which is identical to that of 33 intra-prediction modes that are supported by H.265, or within a 180-degree angular range after 45-degree rotation is performed; and superimposing the vectors, which represent the optimal prediction