Image prediction method and device

Abstract

The invention provides an image prediction method and device. The method comprises the steps of obtaining prediction motion information of an image block; determining an initial prediction block of the image block according to the prediction motion information and a reference image of the image block; carrying out L times of iterative search in the reference image according to the prediction motion information and a whole pixel step length to obtain an intermediate prediction block of the image block, where L is a preset value and L is an integer greater than 1; carrying out single search in the reference image according to the sub-pixel step length to obtain M prediction blocks of the image block, where M is a preset value and M is an integer greater than 1; and determining a target prediction block of the image block according to the M prediction blocks and the intermediate prediction block.and obtaining a predicted value of the pixel value of the image block according to the pixel value of the target prediction block. According to the invention, the data reading amount during image prediction can be reduced.

Description

technical field [0001] The present application relates to the technical field of video coding and decoding, and more specifically, relates to an image prediction method and device. Background technique [0002] When encoding and decoding a video image, in order to reduce the redundancy of transmission data, it is necessary to predict the pixel value of the pixel block of the image to be processed. When predicting an image, an initial prediction block may be determined from the reference image of the image to be processed, and then multiple searches are performed around the initial prediction block, and at least one searched prediction block is compared with the initial prediction block , to find the optimal prediction block. [0003] When searching around the prediction block in the traditional scheme, the prediction block is first searched with an integer pixel step, and then the prediction block is searched with a sub-pixel step. A pixel-by-pixel step search is required,...

AI Technical Summary

Problems solved by technology

[0003] When searching around the prediction block in the traditional scheme, the prediction block is first searched with an integer pixel step, and then the prediction block is searched with a sub-pixel step. It is necessary to search in sub-pixel steps, which will generate a large amount of data for each search, increasing the amount of data read during image prediction, resulting in an increase in the complexity of image prediction

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