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Methods and devices for emulating low-fidelity coding in a high-fidelity coder

A low-fidelity, coding technology used in image communication, digital video signal modification, electrical components, etc.

Active Publication Date: 2016-02-24
VELOS MEDIA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The inapplicability of chroma subsampling to certain types of content poses further problems in the case of mixed content involving natural scenes and computer-generated graphics

Method used

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  • Methods and devices for emulating low-fidelity coding in a high-fidelity coder
  • Methods and devices for emulating low-fidelity coding in a high-fidelity coder
  • Methods and devices for emulating low-fidelity coding in a high-fidelity coder

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Embodiment Construction

[0023] In the following description, some example embodiments are described with reference to the H.264 standard for video coding and / or the developing H.265 / HEVC standard. Those skilled in the art should understand that the present application is not limited to H.264 / AVC or H.265 / HEVC, but is applicable to other video coding / decoding standards, including possible future standards, multi-view coding standards, scalable video coding standards, and reconfigurable video coding standards.

[0024] In the following description, the terms frame, picture, slice, tile and rectangular slice group may be used somewhat interchangeably when referring to video or images. Those skilled in the art will recognize that, in the case of the H.264 standard, a frame may contain one or more slices. In H.265 / HEVC, the term "frame" can be replaced with "picture". In some cases, a series of frames / pictures may be referred to as a "sequence." Other terminology may be used in other video coding stand...

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Abstract

Methods of encoding and decoding video in a low-fidelity mode are described. A coding unit level low-fidelity flag is present in the bitstream to signal whether low-fidelity mode is enabled for a particular coding unit or not. If enabled, then, for that coding unit, the chroma quantization parameter is determined using the luma quantization parameter adjusted by a low-fidelity-mode offset. If not enabled, then, for that coding unit, the chroma quantization parameter is determined using the luma quantization parameter without adjustment by the low-fidelity-mode offset. The chroma quantization parameter is then used in the scaling of quantized chroma transform domain coefficients. Use with luma or other video components is also proposed.

Description

technical field [0001] The present disclosure relates generally to data compression, and more particularly to video encoding methods and apparatus for simulating low-fidelity encoding in high-fidelity encoders. Background technique [0002] Data compression occurs in numerous contexts. Data compression is very commonly used in communications and computer networking to efficiently store, transmit and reproduce information. Data compression finds specific applications in the encoding of images, audio and video. Video presents considerable challenges to data compression due to the large amount of data required for each video frame and the speed at which encoding and decoding often needs to occur. The current state-of-the-art in video encoding is the ITU-TH.265 / HEVC video encoding standard. It defines a plurality of different profiles for different applications, including a main profile, a main still image profile, and the like. [0003] Several standards exist for encoding / ...

Claims

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Application Information

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IPC IPC(8): H04N19/126H04N19/159H04N19/17H04N19/18H04N19/184H04N19/186
CPCH04N19/176H04N19/46H04N19/124H04N19/186
Inventor 大卫·弗莱恩何大可阮·阮
Owner VELOS MEDIA INT LTD
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