Video image encoding and decoding method, encoding device, decoding device and system thereof

Abstract

Embodiments of the present invention provide an encoding method, a decoding method, an encoding apparatus, a decoding apparatus, for a video image. The encoding method includes: determining an optimal integrated candidate block for a current block based on a motion vector integration technology; determining, based a prediction direction of the optimal integrated candidate block, a motion vector derivation mode that needs to be used by a decoder; correcting a motion vector of the current block based on the motion vector derivation mode; and determining a residual between a predicted value and an original value of the current block based on the corrected motion vector, thereby encoding the current block. According to the technical solutions, a more accurate predicted value is obtained by correcting the motion vector, and a smaller residual is generated, thereby improving encoding efficiency, avoiding an increase in data bandwidth, improving decoding quality, and reducing calculation complexity.

Description

technical field [0001] The present invention relates to the field of image processing, and more particularly, to a video image encoding and decoding method, an encoding device, a decoding device and a system thereof in the field of image processing. 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 the block may include the prediction direction, motion vector and reference frame information of the block. The reference frame information may characterize which frame or frames the block is derived from. In the case of low bit rates, especially for high-definition video, the number of bits used to represent motion information often exceeds half of the total bit stream. Therefore, efficient encoding of motion information is crucial. [0003] At present, the inter-frame prediction technolo...

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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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