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Method and device for color gamut mapping

A technology of color gamut mapping and color gamut, which is applied to color TV components, color TV, color signal processing circuits, etc., and can solve the problem of modifying color leaves, etc.

Active Publication Date: 2020-02-11
INTERDIGITAL VC HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a linear lightness map may significantly modify the lightness of all colors in the hue leaf (except those on the gray axis)

Method used

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  • Method and device for color gamut mapping
  • Method and device for color gamut mapping
  • Method and device for color gamut mapping

Examples

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Embodiment Construction

[0047] The present principles will be described more fully hereinafter with reference to the accompanying drawings, examples of which are shown. However, the present principles may be implemented in many alternative forms and should not be construed as limited to the examples set forth herein. Thus, while the present principles are susceptible to various modifications and alternative forms, specific examples thereof are shown by way of example in the drawings and will be described in detail herein. It should be understood, however, that there is no intention to limit the present principles to the particular forms disclosed, but on the contrary, this disclosure is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present principles as defined by the claims.

[0048] The terminology used herein is for the purpose of describing particular examples only and is not intended to be limiting of the present principles. As used herein, ...

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Abstract

The present principles relate to a method and device for gamut mapping from a first color gamut towards a second color gamut. The method comprises the steps: in a plane of constant hue, obtaining a target lightness for a color on the boundary of first gamut with maximum chroma, called first cusp color; and lightness mapping of the color from the first color gamut towards the second color gamut wherein the lightness mapped color is calculated from a parabolic function applied to the color, the parabolic function mapping the first cusp color to a color having the target lightness. According to aparticular characteristic, a preserved chroma is also obtained; and in case the chroma of the color is lower than or equal to the preserved chroma, the lightness mapped color is the color, and in case the chroma of the color is higher than the preserved chroma, the lightness mapped color is calculated from the parabolic function applied to the color.

Description

technical field [0001] The present principles generally relate to image / video encoding / decoding. In particular, but not exclusively, the technical field of the present principles relates to gamut mapping of images whose pixel values ​​belong to a high dynamic range and inverse gamut mapping of images whose pixel values ​​belong to a low dynamic range. Background technique [0002] This section is intended to introduce the reader to various aspects of art, which may be related to various aspects of the present principles that are described and / or claimed below. It is believed that this discussion helps to provide the reader with background information to better understand aspects of the present principles. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art. [0003] In the following, an image contains one or several arrays of samples (pixel values) of a specific image / video format, which for example sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/60
CPCH04N1/6058H04N1/6061H04N9/68H04N1/6066G06T2207/20208H04N9/643G06T5/92
Inventor C.蒂鲍尔特M-J.科莱蒂斯A.马赞特
Owner INTERDIGITAL VC HLDG INC
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