Image prediction method and associated device

Abstract

The embodiment of the invention discloses an image prediction method and an associated device. The image prediction method comprises the following steps: determining motion vectors of W control points in a current image block; calculating the motion vectors of P pixel units of the current image block by using a motion model and the motion vectors of the W control points, wherein the precision of the determined motion vectors of the W control points as 1 / n pixel precision, the precision of the calculated motion vector of each pixel unit in the P pixel units is 1 / N pixel precision, the P pixel units are a part of or all pixel units of the current image block, and N is greater than n; and carrying out interpolation filtering on the pixels of the corresponding pixel units in a reference image of each pixel unit in the P pixel units by using an interpolation filter with a phase number Q to obtain a pixel prediction value of each pixel unit in the P pixel units, wherein Q is greater than n. The technical scheme provided by the embodiment of the invention is conducive to reducing the computational complexity of the image prediction process.

Description

technical field [0001] The present invention relates to the field of video encoding and video decoding, in particular to an image prediction method and related equipment. Background technique [0002] With the development of photoelectric acquisition technology and the growing demand for high-definition digital video, the amount of video data is increasing. The limited heterogeneous transmission bandwidth and diversified video applications continue to put forward higher requirements for video coding efficiency. The formulation of High Efficient Video Coding (English: high efficient video coding, abbreviation: HEVC) standard was started due to need. [0003] The basic principle of video coding and compression is to use the correlation between space domain, time domain and code words to remove redundancy as much as possible. The current popular practice is to use a block-based hybrid video coding framework to achieve video coding compression through steps such as prediction (...

AI Technical Summary

Problems solved by technology

[0006] Since in the prior art, if the low-precision motion vectors and affine motion models of two control points are used to obtain the high-precision pixel prediction value of the current image block, then at least two steps of interpolation filtering operations are required (each step of interpolation filtering The number of intermediate cache and memory operations required for the operation is relatively large), which makes the overall image prediction process require a relatively large number of intermediate cache and memory operations, and the computational complexity becomes relatively high

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