Video decoding method, encoding method and terminal

Abstract

A video decoding method and encoding method, and a terminal. The decoding method comprises: acquiring an initial candidate motion vector set of a current block under decoding; removing candidate motion vectors not complying with a preset condition from the initial candidate motion vector set, and forming a new candidate motion vector set by use of remaining candidate motion vectors in the initial candidate motion vector set; and performing decoding according to the new candidate motion vector set. In the embodiment of the present application, some motion vectors can be removed, according to the preset condition, from the candidate motion vector set. On the condition that the number of the candidate motion vectors is decreased, the amount of information of reconstructed pixels in a reference frame obtained according to each candidate motion vector is decreased accordingly. Meanwhile, these candidate motion vectors are adjacent to each other, and selected reference blocks overlap each other, so that the reference blocks can be reused. As a result, the frequency of memory reading is decreased, hardware design is simplified, and encoding / decoding performance is improved.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular, to a video decoding method, an encoding method and a terminal. Background technique [0002] Motion prediction and motion compensation are important technologies in video compression. Part of the bits in the video compression code stream are used to transmit motion vector information, especially in the case of low bit rates. The bits usually exceed 50% of the total bits of the code stream. For the video coding of continuous dynamic images, several consecutive images are divided into three types: P, B, and I. Taking B frame as an example, it is based on the difference between the data of the adjacent previous frame, this frame, and the next frame. Compressing the current frame, that is, the B frame can obtain a motion vector set according to its previous frame and the next frame. Therefore, in order to improve the coding efficiency, in the prior art, the mot...

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Problems solved by technology

[0005] The embodiment of the present application provides a video decoding method, an encoding method, and a terminal to solve the problem that the existing large number of candidate motion vectors leads to frequent reading of memory and reduces the performance of encoding and decoding

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