Chroma quantization in video coding

A technology of video coding and chroma components, which is applied in the field of chroma quantization in video coding, and can solve problems affecting coding performance and subjective quality

Active Publication Date: 2015-03-18
APPLE INC
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  • Application Information

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Problems solved by technology

In this scheme, given the different characteristics of natural versus synthetic content and the possibility of natural content initially being up-converted to a 4:2:0 image for display to 4:4:4, there is the ability to control the chroma quantization parameters Can significantly impact encoding performance and subjective quality

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  • Chroma quantization in video coding
  • Chroma quantization in video coding
  • Chroma quantization in video coding

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Embodiment Construction

[0033] In the following description, for purposes of explanation, numerous details are set forth. However, one skilled in the art will recognize that the present invention may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order not to obscure the description of the invention with unnecessary detail.

[0034]In order to provide a video coding system that can specify a chroma quantization parameter (chroma QP) more flexibly, some embodiments of the present invention provide a method of signaling an additional chroma QP offset value specific to a quantization group. In some embodiments, each quantization group explicitly specifies its own set of chroma QP offset values. In some embodiments, a table of possible sets of chroma QP offset values ​​is specified in the header area of ​​a picture or slice, and each quantization group uses an index to select from the table for determining its own chr...

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Abstract

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.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application 61 / 875664, filed September 9, 2013. US Provisional Patent Application 61 / 875664 is hereby incorporated by reference. Background technique [0003] In order to improve video coding efficiency compared with previous video coding standards and technologies such as MPEG-2, MPEG-4 Part 2, MPEG-4AVC / H.264, VC1, and VP8, the next generation jointly developed by ITU and ISO MPEG The High Efficiency Video Coding (HEVC / H.265) standard introduces several new video encoding tools. In the first version, the new standard supports encoding of YUV 4:2:08 or 10-bit material using three well-defined profiles, Main, Main 10 and Main Still Picture profile. However, in support of sampling precision (bit depth) higher than 10 bits and different color sampling formats and color spaces including YUV 4:2:0, YUV 4:4:4 and RGB 4:4:4, etc., still making progress. The encod...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/186H04N19/124H04N19/146H04N19/86
CPCH04N19/124H04N19/30H04N19/0009H04N19/126H04N19/157H04N19/186H04N19/70H04N19/86H04N19/146H04N19/96H04N19/13H04N19/136H04N19/15H04N19/159H04N19/172H04N19/176H04N19/51H04N19/61H04N19/134
Inventor A·多拉佩斯G·科泰
Owner APPLE INC
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