Methods of encoding and decoding images, devices for encoding and decoding images and corresponding computer programs thereof

By selecting associated transform operation groups based on the prediction pattern and adjusting the number of transform operations, the trade-off between memory resources and coding performance in the prior art is resolved, achieving more efficient memory usage and coding performance.

CN115802030BActive Publication Date: 2026-07-17ORANGE SA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ORANGE SA
Filing Date
2016-08-26
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing video encoders do not optimize the trade-off between memory resources and encoding performance, especially with excessive storage requirements for the transform matrix, which affects the cost and efficiency of hardware implementation.

Method used

Select the associated transform operation group based on the prediction mode, and adjust the number of transform operations to make it different from other modes in each prediction mode, thereby reducing memory resource requirements while maintaining or improving coding performance.

Benefits of technology

By optimizing the storage method of transform operations, the memory resource requirements of the encoder and decoder are significantly reduced, while maintaining or improving encoding performance and reconstruction quality.

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Abstract

The invention relates to a method of encoding at least one image (ICj) split into a plurality of blocks, said method implementing, for a current block (Bi) of said image to be encoded: a prediction (C3) of said current block according to a prediction mode (MPs) chosen from among a plurality of predetermined prediction modes; a calculation (C4) of a residual block of data representative of the difference between a predictor block (BPopt) obtained after said prediction and said current block; an application (C6) of a transform operation to the data of said residual block, said transform operation belonging to a set of transform operations previously stored (C0) in association with the chosen prediction mode; an encoding (C8) of the data obtained after said transform operation, said encoding method being characterized in that, during the storage (C0) of the set of transform operations associated with said chosen prediction mode, the number of transform operations contained in said set is different from the number of transform operations contained in a set of transform operations stored in association with at least one other predetermined prediction mode among said plurality of predetermined prediction modes.
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