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Extended range for chroma QP values

A chromaticity and range technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of lack of fine-grained control and inability to provide responsiveness

Active Publication Date: 2015-04-29
MICROSOFT TECH LICENSING LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, previous methods for controlling and using QP values ​​for chroma components have various disadvantages, including a lack of fine-grained control in high-QP situations, and an inability to provide proper QP in other decoding operations. level of responsiveness

Method used

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  • Extended range for chroma QP values

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Embodiment Construction

[0027] An important aspect of the design for the compression of video content and other image content using a multi-component color space representation is the control over the granularity of the quantization of each color component. Such control is typically achieved by establishing a proportional relationship between the quantization step size(s) associated with one color component (often referred to as the primary component) and the other color component (often referred to as the secondary component). Typically, the primary component is a luma component and the secondary component(s) is a chrominance component(s).

[0028]For example, in the ITU-T H.264 standard, the relationship between QP for luma and chroma components is in terms of QP values, look-up tables, and encoder-controlled offsets, sometimes together with The scaling factors are determined together with the quantized scaling matrix. With regard to this aspect of encoding control for QP, existing designs have so...

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Abstract

Innovations in control and use of chroma quantization parameter ("QP") values that depend on luma QP values. More generally, the innovations relate to control and use of QP values for a secondary color component that depend on QP values for a primary color component. For example, during encoding, an encoder determines a QP index from a primary component QP and secondary component QP offset. The encoder maps the QP index to a secondary component QP, which has an extended range. The encoder outputs at least part of a bitstream including the encoded content. A corresponding decoder receives at least part of a bitstream including encoded content. During decoding, the decoder determines a QP index from a primary component QP and secondary component QP offset, then maps the QP index to a secondary component QP, which has an extended range.

Description

Background technique [0001] Engineers use compression (also known as source encoding) to reduce the bit rate of digital video. Compression reduces the cost of storing and transmitting video information by converting it to a lower bit rate form. Decompression (also known as decoding) reconstructs the original version of the information from the compressed form. A "codec" is an encoder / decoder system. [0002] Over the past two decades, various video codec standards have been adopted, including H.261, H.262 (MPEG-2 or ISO / IEC 13818-2), H.263 and H.264 (AVC or ISO / IEC 14496-10) and MPEG-1 (ISO / IEC 11172-2), MPEG-4 Visual (ISO / IEC 14496-2) and SMPTE 421M standards. Recently, the HEVC standard is under development. Video codec standards typically define options for the syntax of an encoded video bitstream, detailing the parameters in that bitstream when certain features are used in encoding and decoding. In many cases, video codec standards also provide details about the deco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/70H04N19/126H04N19/186H04N19/174
CPCH04N19/70H04N19/126H04N19/186H04N19/146H04N19/174H04N19/124H04N19/44
Inventor G. J. 萨利文S. 卡努穆里
Owner MICROSOFT TECH LICENSING LLC
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