Image encoding / decoding method and apparatus

By determining and modifying the intra prediction mode and prediction block in image encoding and decoding, the problem of insufficient intra prediction performance and accuracy in the prior art is solved, and more efficient and accurate image processing is achieved.

CN119743594APending Publication Date: 2025-04-01INST OF IMAGE TECH INC
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Patent Information

Application Number
CN202411696183.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2018-09-07
Filing Date
2019-09-09
Publication Date
2025-04-01

AI Technical Summary

Technical Problem

The prior art is difficult to effectively improve the performance and accuracy of intra prediction in image encoding and decoding.

Method used

By determining the intra prediction mode of the target block, the prediction block is generated and modified to improve the efficiency and accuracy of intra prediction. The specific method includes selecting a prediction mode candidate group based on the state information of the target block and modifying the prediction block through weighted filtering or interpolation filters.

Benefits of technology

Effective intra prediction mode determination and prediction block modification are realized, and the performance and accuracy of image encoding and decoding are improved.

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Abstract

An image encoding / decoding method and apparatus according to the present invention are capable of determining an intra prediction mode of a target block; generating a prediction block of the target block based on the intra prediction mode; and reconstructing the current block on the basis of the prediction block and a residual block of the current block, in which an intra prediction mode of the target block is determined as a mode within the prediction mode candidate group according to state information of the target block, and in which when a color component of the target block is a chrominance component, the intra prediction mode of the target block is determined as a mode within the prediction mode candidate group. The prediction mode candidate group includes a directional mode, a non-directional mode, a color mode, and a color copy mode.
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