Intra-frame chroma prediction mode selection method, image processing device and storage device

Abstract

The invention discloses an intra-frame chroma prediction mode selection method, an image processing device and a storage device, and the method comprises the steps: constructing a candidate list of chroma prediction modes, the candidate list comprising a plurality of chroma prediction modes; selecting a part of brightness prediction mode of the brightness block corresponding to the current chromablock as a replacement mode; replacing at least one chroma prediction mode in the candidate list with the replacement mode; and selecting an optimal prediction mode from the replaced candidate list topredict the chroma of the current chroma block by using the optimal prediction mode. In this way, the coding compression rate can be increased.

Description

technical field [0001] The present application relates to the technical field of image processing, and in particular to a method for selecting an intra-frame chroma prediction mode, an image processing device, and a storage device. Background technique [0002] In the video coding system, there are mainly several modules such as prediction, transform quantization, and entropy coding. The prediction module can be divided into intra-frame prediction and inter-frame prediction, which are respectively used to eliminate redundant information in the spatial domain and redundant information in the temporal domain. Intra prediction is a method to eliminate spatial redundancy by utilizing the strong correlation between adjacent pixels. Intra prediction includes luma prediction and chroma prediction, and both chroma prediction and luma prediction have multiple prediction modes. The size of the compressed video frame is related to the prediction mode selected by the encoder during the...

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Problems solved by technology

[0003] However, among the candidate prediction modes adopted by the existing optimal chroma prediction mode selection process, there are prediction modes that do not have a strong correlation with the texture trend of luma blocks, ignoring the texture correlation of chroma and luma blocks, and the encoder chooses such mode is usually less likely, which will cause the encoder to be unable to select prediction modes that are strongly correlated with other luma modes as candidate modes, and eventually lead to a decrease in encoding compression rate

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