Transform and last significant coefficient position signaling for low frequency inseparable transforms in video coding

By adopting signaling technology based on location-based restriction and LFNST syntax elements in video encoding and decoder, the problem of large overhead of transform coefficient decoding in video encoding is solved, the video decoding efficiency is improved, and it is applicable to a variety of video encoding and decoding standards.

CN120201191APending Publication Date: 2025-06-24QUALCOMM INC
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Patent Information

Application Number
CN202510595843.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2020-06-11
Filing Date
2020-06-12
Publication Date
2025-06-24

AI Technical Summary

Technical Problem

When existing video encoding technology processes video data, it is difficult to effectively manage and reduce the signaling overhead in transform coefficient decoding, which affects the decoding efficiency.

Method used

By using signaling techniques based on position-based restriction and low-frequency inseparable transform (LFNST) syntax elements in video encoders and decoders, the return-to-zero mode of zero coefficients defined by specifications is determined and the LFNST syntax elements are signaled at the transform unit (TU) level to reduce signaling overhead.

Benefits of technology

This technology can improve the efficiency of video decoding, reduce signaling overhead, and is suitable for advanced video codecs, including extensions of HEVC and next-generation video decoding standards such as VVC.

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Abstract

A video decoder determines a return-to-zero mode that specifies zero coefficients defined based on a block size of a current block and a low frequency non-separable transform (LFNST) syntax element. The LFNST syntax element is signaled at a transform unit (TU) level. In addition, the video decoder determines transform coefficients of the current block. The transform coefficients of the current block include transform coefficients in the LFNST region of the current block and transform coefficients outside the LFNST region of the current block. As part of determining the transform coefficients of the current block, the video decoder applies an inverse LFNST to determine values of one or more transform coefficients in the LFNST region of the current block. The video decoder may also determine that a transform coefficient of the current block in the region of the current block defined by the return-to-zero mode is equal to 0.
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Citation Information

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