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Chroma quantization in video coding

專利號
US11659182B2
公開日期
2023-05-23
申請人
Apple Inc.(US CA Cupertino)
發(fā)明人
Alexandros Tourapis; Guy Cote
IPC分類
H04N19/124; H04N19/30; H04N19/70; H04N19/126; H04N19/186; H04N19/157; H04N19/86; H04N19/136; H04N19/13; H04N19/15; H04N19/159; H04N19/51; H04N19/61; H04N19/96; H04N19/172; H04N19/176
技術(shù)領(lǐng)域
chroma,qp,offset,luma,qg,offsets,picture,values,coding,qgs
地域: CA CA Cupertino

摘要

A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.

說明書

As used in this specification and any claims of this application, the terms “computer”, “server”, “processor”, and “memory” all refer to electronic or other technological devices. These terms exclude people or groups of people. For the purposes of the specification, the terms display or displaying means displaying on an electronic device. As used in this specification and any claims of this application, the terms “computer readable medium,” “computer readable media,” and “machine readable medium” are entirely restricted to tangible, physical objects that store information in a form that is readable by a computer. These terms exclude any wireless signals, wired download signals, and any other ephemeral signals.

While the invention has been described with reference to numerous specific details, one of ordinary skill in the art will recognize that the invention can be embodied in other specific forms without departing from the spirit of the invention. In addition, a number of the figures (including FIGS. 7, 13, and 17) conceptually illustrate processes. The specific operations of these processes may not be performed in the exact order shown and described. The specific operations may not be performed in one continuous series of operations, and different specific operations may be performed in different embodiments. Furthermore, the process could be implemented using several sub-processes, or as part of a larger macro process. Thus, one of ordinary skill in the art would understand that the invention is not to be limited by the foregoing illustrative details, but rather is to be defined by the appended claims.

權(quán)利要求

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