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Device and method for processing color image data

A technology of video processing and color tone, applied in image communication, color signal processing circuits, instruments, etc., to achieve the effect of preventing contrast

Inactive Publication Date: 2009-09-23
TRIDENT MICROSYSTEMS (FAR EAST) LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In general, any sudden discontinuity in the first derivative of luminance results in visible artifacts in the resulting image

Method used

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  • Device and method for processing color image data
  • Device and method for processing color image data
  • Device and method for processing color image data

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Embodiment Construction

[0040] image 3 A block diagram of a color gamut mapping system in the optical domain is shown. Through the video path, i.e. through the gamma function 10, the adaptive gamut mapping function 20, the soft clipping function 30 and the degamma function 40 (as per figure 1 ), to process the input video signal IN. This adaptive processing of the adaptive color gamut function is performed by the luminance unit LU, saturation unit SU, RGB unit RGB, white point unit WPU, triangle unit TU, and color matrix unit CMU. The luminance unit LU measures the brightness of the input signal IN, and the saturation unit SE measures the saturation of the input signal IN. According to the measured brightness 1um and saturation sat to determine the best coefficient. The mapping coefficients of the gamut mapping are calculated according to predetermined coefficients (ie, interpolated by the shift and rotation values ​​of each pixel in the parameters of the gamut matrix generator). Changing the co...

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Abstract

The present invention relates to a video processing device comprising a luminance and saturation detector (LSHD) for detecting the luminance values (lum) and the saturation values (sat) of pixels of an input video signal (IN); and a white-point, saturation and hue modulator (WSH) for transforming luminance and saturation properties (lum, sat) of the pixels of the input video signal (IN) into white-point, saturation and hue correction factors (W, Wc; S, Sc; H, Hc). The video device also comprises a color gamut matrix generating unit (CGMG) for generating a color gamut matrix in the perception domain based on the white-point, saturation and hue correction factors (Wc, Sc, Hc) of the white-point, saturation and hue modulator (WSH); a color gamut mapping unit (20) for multiplying the pixels of the input video signal (IN) with a color gamut matrix generated by the color gamut matrix generating unit (CGMG); and a clipping unit (31) for clipping the results of the a color gamut mapping unit (20) which are out of a predefined range.

Description

technical field [0001] The invention relates to a video processing device and a method for processing color image data. Background technique [0002] More and more mobile electronic devices are being designed with color display devices for displaying color images. For example, these color images can be produced by cameras or video processors. The provided color image data must undergo image processing to improve the representation of the image on a display device. Nowadays, multimedia data must be displayed on devices such as mobile phones, multimedia portable players, and the like. Typically, the display technologies used for these mobile devices have some limitations, especially in terms of image quality and color reproduction. The supplied image data is usually color-coded according to an existing standard. These criteria were chosen to aid in the design of displays based on available materials. Thus, as long as the camera or display matches the chosen standard, a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/67G09G5/02H04N1/60
CPCG09G2360/16H04N9/67G09G5/02G09G2320/0606
Inventor 马特乌斯·J·G·拉默斯彼得鲁斯·M·德格雷夫
Owner TRIDENT MICROSYSTEMS (FAR EAST) LTD
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