Image encoding apparatus and method, image decoding apparatus and method, and storage medium

By determining the deblocking filter processing intensity at the block boundaries of weighted intra/inter-frame predictions in the image coding device, the problem of block boundary distortion in VVC is solved, and image quality is improved.

CN116916044BActive Publication Date: 2026-07-10CANON KK
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CANON KK
Filing Date
2019-11-11
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In VVC, existing unblocking filters cannot effectively suppress distortion at block boundaries in weighted intra/inter-frame prediction.

Method used

By determining the deblocking filter processing strength between blocks in the image coding device, appropriate deblocking filter processing is performed on the block boundaries of weighted intra/inter-frame prediction. The filter strength is determined using the block-based prediction mode and the prediction mode of adjacent blocks, and high-intensity filtering is performed when necessary.

Benefits of technology

It effectively suppresses distortion at block boundaries and improves image quality.

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Abstract

The present application provides an image encoding apparatus and method, an image decoding apparatus and method, and a storage medium. In a prediction process, one of a first mode, a second mode, and a third mode can be used, the first mode is used to derive prediction pixels of a block using pixels in an image including the block, the second mode is used to derive prediction pixels of the block using pixels in an image different from the image including the block, and the third mode is used to generate prediction pixels of the block using both the pixels in the image including the block and the pixels in the image different from the image including the block. In a case where the third mode is used in at least one of a first block and a second block, an intensity of a deblocking filter process to be performed with respect to a boundary between the first block and the second block is set to an intensity same as in a case where the first mode is used in at least one of the first block and the second block.
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Citation Information

Patent Citations

  • JP2014507863A

  • JP2013229866A

  • US20180091812A1