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4289results about "Colour-separation/tonal-correction" patented technology

Method for transforming three color input signals to four or more output signals for a color display

A method for transforming three color input signals (R, G, B) corresponding to three gamut defining color primaries to four color output signals (R′, G′, B′, W) corresponding to the gamut defining color primaries and one additional color primary W for driving a display having a white point different from W includes the steps of: normalizing the color input signals (R,G,B) such that a combination of equal amounts in each signal produces a color having XYZ tristimulus values identical to those of the additional color primary to produce normalized color signals (Rn,Gn,Bn); calculating a common signal S that is a function F1 of the three normalized color signals (Rn,Gn,Bn); calculating a function F2 of the common signal S and adding it to each of the three normalized color signals (Rn,Gn,Bn) to provide three color signals (Rn′,Gn′,Bn′); normalizing the three color signals (Rn′,Gn′,Bn′) such that a combination of equal amounts in each signal produces a color having XYZ tristimulus values identical to those of the display white point to produce three of the four color output signals (R′,G′,B′); and calculating a function F3 of the common signal S and assigning it to the fourth color output signal W.
Owner:GLOBAL OLED TECH

System and method for digital image tone mapping using an adaptive sigmoidal function based on perceptual preference guidelines

An adaptive image tone mapping curve based on perceptual preference guidelines is generated as a sigmoidal function, in which the sigmoidal function parameters (slope and shift) are determined by original image statistics. Tone curves generated for different images each have a smooth sigmoidal shape, so that the tone mapping process does not change the image histogram shape drastically. The sigmoidal function has the form: <math-cwu id="MATH-US-00001"> <number>1< / number> t it ( x ) = 100 1 + exp it ( - alpha it ( x / 100 - beta ) ) , <mathematica-file id="MATHEMATICA-00001" file="US20020171852A1-20021121-M00001.NB" / > <image id="EMI-M00001" wi="216.027" he="18.96615" file="US20020171852A1-20021121-M00001.TIF" imf="TIFF" ti="MF" / > < / math-cwu> where alpha is the slope parameter and beta is the shift parameter. The input value x in the sigmoidal function varies in the range [0, 100], because the tone curve is generated on an L* scale, which has values from 0 to 100. The sigmoidal tone curve calculation can be implemented efficiently using simple arithmetic operations by pre-calculating and storing various factors used in the calculation of alpha and beta and by pre-generating a pair of fixed tone curves with two extreme slopes and interpolating between the curves.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
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