Intellectual Property India Publishes Patent Application for Interaction Between Secondary Transform And Sub-Block Transform

MUMBAI, India, Aug. 31 -- Intellectual Property India has published a patent application (202617081733 A) filed by Interdigital Ce Patent Holdings on July 02, 2026, for Interaction Between Secondary Transform And Sub-Block Transform.

Inventors include Naser, Karam; Le Leannec, Fabrice; Bonnineau, Charles; and Urban, Fabrice.

The application for the patent was published on August 28, 2026, under issue no. 35/2026.

Abstract: A device (e.g., a decoder for video decoding) may determine that sub-block transform (SBT) is enabled for a video block. The device may determine whether a secondary transform (e.g., low-frequency non-separable transform (LFNST) or non-separable primary transform (NSPT)) is enabled for the video block. The device may determine a transform function to decode the video block based on the determination of whether the secondary transform is enabled for the video block. For example, a first type of transform function (e.g., discrete cosine transform (DCT) II) may be used to decode the video block if LFNST or NSPT is enabled for the video block. A second type of transform function may be used to decode the video block if the secondary transform is disabled for the video block. The device may decode the video block using the transform function.

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