Image gamut mapping

A color gamut mapping and color gamut technology, applied in image communication, electrical components, etc., can solve problems such as loss of details

Inactive Publication Date: 2009-08-12
TP VISION HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this approach works satisfactorily for images with only a few out-of-gamut pixels, it can still result in loss of detail when larger areas of the image are outside the reproduced gamut

Method used

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Examples

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Embodiment Construction

[0036] figure 1 An example of the input and output gamuts and their RGB primaries in the CIE xy chromaticity diagram is shown. The input color gamut IG is defined by the input primary colors Rin, Gin, Bin, which form the vertices of the input color gamut triangle. The reproduction color gamut RG is defined by the reproduction RGB primary colors Ro, Go, and Bo, and the reproduction RGB primary colors form the vertices of the reproduction color gamut triangle. The input gamut triangle contains the reproduced gamut triangle. As an example, two input pixels P10 and P20 are shown. The input pixel P20 is already within the reproduction gamut RG, so no correction is required. The input pixel P10 is located outside the reproduction gamut RG and thus cannot be reproduced faithfully. The invention concerns how to scale such an input pixel P10 outside the reproduction gamut RG into the reproduction gamut RG with minimal loss of detail.

[0037] figure 2 An example of gamut mapping...

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Abstract

A method of gamut mapping maps an input image composed of pixels and having an input gamut (IG) defined by input RGB primaries (Ri, Gi, Bi) to a reproduction gamut (RG) defined by reproduction RGB primaries (Ro, Go, Bo). The reproduction gamut (RG) is narrower than the input gamut (IG). An input signal (RGBin) defined with respect to the input RGB primaries (Ri, Gi, Bi) is color transformed (1) into a transformed signal (RGBt) defined with respect to the reproduction RGB primaries (Ro, Go, Bo), whereby color information of the pixels (Pl, P2, P3) within the reproduction gamut (RG) is preserved. Scaling factors (SFi) indicating a distance between on the one hand pixels (Pl, P2, P3) of the transformed signal (RGBt) which are outside the reproduction gamut (RG), and on the other hand an edge of the reproduction gamut (RG) are determined (2). The scaling factors (SFi) of pixels (Pl, P2, P3) of the transformed signal (RGBt) are spatial low-pass filtered (3) to obtain filtered factors (FFi) for these pixels (Pl, P2, P3). Component signal values of the transformed signal (RGBt) of the pixels (Pl, P2, P3) are corrected (4) in response to the filtered factors (FFi) to obtain reproduction signal values (RGBo) which are input values (RGBi) moved towards inside the reproduction gamut (RG).

Description

technical field [0001] The present invention relates to a color gamut mapping method of an input image composed of pixels and having an input color gamut defined by input RGB primary colors to a reproduction color gamut defined by reproduced RGB primary colors, wherein the reproduction color gamut is narrower than the input color gamut. The invention also relates to a gamut mapping device for an input image, a video signal receiver comprising a gamut mapping device, a camera comprising a gamut mapping device and a gamut mapping method comprising a A computer program product of code for the steps. Background technique [0002] Video signals are usually defined with a fixed set of primaries, such as those defined by the European Broadcasting Union (EBU). In practice, however, the reproduced color gamut may differ from that of the input signal, requiring a gamut mapping algorithm to establish optimal drive values ​​for display of the video signal. This problem arises frequent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/60
CPCH04N1/6058
Inventor R·T·J·穆伊斯E·H·A·兰根迪克
Owner TP VISION HLDG
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