Sub-block motion prediction and coding method, coder and storage device

Abstract

The invention discloses a sub-block motion prediction and coding method, a coder and a storage device, and the method comprises the steps: obtaining a reference block, a co-located frame and a reference frame of a current block, and the number of at least one of the reference block, the co-located frame and the reference frame being greater than one; obtaining motion vectors of the current blocks,wherein the motion vector of each current block corresponds to a group of reference parameters; obtaining a common position block of a plurality of sub-blocks based on each group of reference parameters, the plurality of sub-blocks being obtained by dividing the current block, the common position block of the sub-blocks being a block where a first offset point is located in a co-located frame, and the first offset point being a point after a specified point in the sub-blocks offsets a reference motion vector; obtaining candidate motion vectors of the sub-blocks by utilizing the motion vectorsof the common position blocks of the sub-blocks; and obtaining a sub-block motion prediction result of the current block based on all candidate motion vectors of the sub-block according to the principle of minimum prediction cost. In this way, the prediction accuracy can be improved.

Description

technical field [0001] The present application relates to the technical field of encoding and decoding, and in particular relates to sub-block motion prediction, an encoding method, an encoder and a storage device. Background technique [0002] Because the amount of video image data is relatively large, it is usually necessary to compress the video pixel data, thereby reducing the amount of video data. The compressed data is called a video code stream. The video code stream is transmitted to the client through a wired or wireless network, and then decoded and viewed, which can achieve the purpose of reducing network bandwidth and storage space during the transmission process. [0003] The entire video coding process includes prediction, transformation, quantization, encoding and other processes, in which prediction is divided into two parts: intra prediction and inter prediction. Inter-frame prediction uses the temporal correlation between image frames to compress the image...

AI Technical Summary

Problems solved by technology

In the long-term research and development process, the inventors of this application found that the current inter-frame prediction mode still has certain limitations, which also affects the accuracy of inter-frame prediction to a certain extent.

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