Peking University

Guisen Xu

Wen Gao

Ronggang Wang

Kui Fan

Zhenyu Wang

An embodiment of the present disclosure discloses an intra-prediction-based encoding and decoding method, apparatus and filter, and belongs to a video coding technical field. The method comprises: acquiring reconstructed pixels adjacent to a to-be-predicted prediction block; determining corresponding reconstructed pixels adjacent to the to-be-predicted prediction block among the reconstructed pixels as reference pixels for filtering, based on prediction modes of the to-be-predicted prediction block; based on the reference pixels, using a filter corresponding to prediction modes of the to-be-predicted prediction block to filter interim prediction values of the to-be-predicted prediction block, to obtain new pixel values of the to-be-predicted prediction block, wherein the interim prediction values are obtained based on other intra prediction methods; performing a CLIP operation on the new pixel values of the to-be-predicted prediction block, to obtain a first prediction value of the to-be-predicted prediction block. By the method provided in the specification, the accuracy of intra prediction may be improved, and coding efficiency may be improved.

Intra-prediction-based encoding and decoding method, apparatus and filter

The present application provides methods, systems, devices and computer-readable mediums for encoding and decoding transform. A method of the present application comprises: performing transform-encoding on a prediction residual block separately using a plurality of transform matrices, to obtain transformed residual blocks; based on the transformed residual block, determining, by a rate-distortion optimization decision, a transform matrix or a combination of transform matrices matching the residual characteristics of the prediction residual block from the plurality of transform matrices, and determining a transformed residual block to be outputted in a bitstream. Compared with the prior art, the method of the embodiments of the present invention performs a residual transform using transform matrices that are more closely matched with the residual characteristic, thereby improving the expression of the residual signal and improving the coding efficiency of the residual block.

Methods, systems, devices and computer-readable mediums for encoding and decoding transform matrices matching residual characteristics of prediction residual block

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Shenzhen, China

Guisen Xu