Encoding and decoding method, encoding device, decoding device and system for video images

Abstract

An embodiment of the invention provides an encoding method, a decoding method, an encoding device, a decoding device and a system for video images. The encoding method includes determining an optimum integration alternative block of a current block on the basis of the motion vector integration technology; determining a motion vector calculation mode required by a decoding side on the basis of the prediction direction of the optimum integral alternative block; rectifying the motion vector of the current block on the basis of the motion vector calculation mode; determining residual error between a predicted value and an original value of the current block on the basis of the rectified motion vector so as to encode the current block. According to the technical scheme in the embodiment, more accurate predicted value can be acquired through the rectified motion vector, smaller residual error is generated, encoding efficiency can be improved, increase of data bandwidth is avoided, and encoding quality can be improved while computing complexity is reduced.

Description

technical field [0001] The present invention relates to the field of image processing, and more specifically, to a method for encoding and decoding video images in the field of image processing, an encoding device, a decoding device and a system thereof. Background technique [0002] Motion prediction and motion compensation are important technologies for video compression, and a considerable part of the compressed code stream is used to transmit motion information. The motion information of a block may include a prediction direction, a motion vector, and reference frame information of the block. The reference frame information may indicate which frame or frames the block is obtained with reference to. In the case of low bit rate, especially for high-definition video, the number of bits used to represent motion information often exceeds half of the total bit rate. Therefore, efficient encoding of motion information is crucial. [0003] At present, inter-frame prediction t...

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Problems solved by technology

[0006] Although in the motion vector fusion technology, the encoding efficiency can be improved by encoding the index value instead of the motion vector of the current block, the motion vector of the current block is not exactly the same as the motion loss of the surrounding blocks, and the motion vector of the surrounding blocks is directly used instead. There is a large error in the motion vector of the current block, which reduces the accuracy of motion compensation, affects the compression of the image, and deteriorates the encoding quality of the image.

[0007] Although at the encoding end, the motion vector of the current block can be corrected at the decoding end by encoding the motion vector difference between the motion vector of the current block itself and the motion vector of the best fusion candidate block, the encoding The motion vector difference will occupy a large number of bits in the encoded code stream, thus affecting the encoding efficiency

Although at the encoding end, the residual error between the current block under the motion vector of the best fusion candidate block and the original value of the current block can be encoded, and the residual error can be passed to the decoding end for correction, but since the current block is in the The residual between the motion vector of the best fusion candidate block and the original value of the current block is large, so that the residual will occupy a large number of bits in the coded stream, which will also affect the coding efficiency

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