Patent ID: 11917209
Assignee: TENCENT AMERICA LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A method of processing visual media data, the method comprising:
performing a conversion between a visual media file and a bitstream of a visual media data according to a format rule,
wherein the bitstream includes syntax elements, the syntax elements being of various types that correspond to transform coefficients of a transform block,
wherein the format rule specifies that, for each transform coefficient in a given frequency region of the transform block, based on a location of the frequency region, for one type of the syntax elements:
a template magnitude of a respective transform coefficient is determined, the template magnitude being a single value representing magnitudes of a local template of the respective transform coefficient; and
one of candidate context models is identified for coding a respective bin of the syntax elements according to a mapping between the candidate context models and different possible values of the template magnitude, at least two possible values of the template magnitude being mapped to a same one of the candidate context models.