Improvements in selection of secondary transform sets

By identifying the intra-frame prediction mode and selecting the transform set index, and dynamically selecting the transform set, the problems of insufficient encoding and decoding accuracy and high signal notification cost in the existing technology are solved, and more efficient video compression is achieved.

CN122460080APending Publication Date: 2026-07-24TENCENT AMERICA LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TENCENT AMERICA LLC
Filing Date
2025-01-10
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing video encoding and decoding technologies struggle to effectively select suitable transform sets in intra-frame prediction mode, resulting in insufficient encoding and decoding accuracy and high signal notification costs.

Method used

By identifying the intra-prediction mode of the current block, the transform set index is dynamically selected, the most suitable transform set is chosen from multiple transform sets, and transform set information is conditionally signaled to improve encoding and decoding accuracy and reduce signaling cost.

Benefits of technology

It improves the accuracy of video encoding and decoding, reduces the cost of signal notification, and enhances video compression efficiency.

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Abstract

An example method of video coding includes receiving a video bitstream including a current block and a syntax element, and identifying an intra prediction mode of the current block. The method also includes parsing the syntax element to determine whether to change the intra prediction mode when deriving a transform set index, and deriving the transform set index of the current block based on the intra prediction mode and the parsed syntax element. The method also includes selecting a first transform set from a plurality of transform sets according to the transform set index, and reconstructing the current block using the first transform set.
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