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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| #ifndef common_utils_OnlineStats_hpp | ||
| #define common_utils_OnlineStats_hpp | ||
|
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| namespace common_utils { | ||
|
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| class ColorUtils { | ||
| public: | ||
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| static void valToRGB(double val0To1, unsigned char& r, unsigned char& g, unsigned char& b) | ||
| {//actual visible spectrum is 375 to 725 but outside of 400-700 things become too black | ||
| wavelengthToRGB(val0To1 * (700 - 400) + 400, r, g, b); | ||
| } | ||
|
|
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| /** | ||
| * Convert a wavelength in the visible light spectrum to a RGB color value that is suitable to be displayed on a | ||
| * monitor | ||
| * | ||
| * @param wavelength wavelength in nm | ||
| * @return RGB color encoded in int. each color is represented with 8 bits and has a layout of | ||
| * 00000000RRRRRRRRGGGGGGGGBBBBBBBB where MSB is at the leftmost | ||
| */ | ||
| static void wavelengthToRGB(double wavelength, unsigned char& r, unsigned char& g, unsigned char& b) { | ||
| double x, y, z; | ||
| cie1931WavelengthToXYZFit(wavelength, x, y, z); | ||
| double dr, dg, db; | ||
| srgbXYZ2RGB(x, y, z, dr, dg, db); | ||
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| r = static_cast<unsigned char>(static_cast<int>(dr * 0xFF) & 0xFF); | ||
| g = static_cast<unsigned char>(static_cast<int>(dg * 0xFF) & 0xFF); | ||
| b = static_cast<unsigned char>(static_cast<int>(db * 0xFF) & 0xFF); | ||
| } | ||
|
|
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| /** | ||
| * Convert XYZ to RGB in the sRGB color space | ||
| * <p> | ||
| * The conversion matrix and color component transfer function is taken from http://www.color.org/srgb.pdf, which | ||
| * follows the International Electrotechnical Commission standard IEC 61966-2-1 "Multimedia systems and equipment - | ||
| * Colour measurement and management - Part 2-1: Colour management - Default RGB colour space - sRGB" | ||
| * | ||
| * @param xyz XYZ values in a double array in the order of X, Y, Z. each value in the range of [0.0, 1.0] | ||
| * @return RGB values in a double array, in the order of R, G, B. each value in the range of [0.0, 1.0] | ||
| */ | ||
| static void srgbXYZ2RGB(double x, double y, double z, double& r, double& g, double& b) { | ||
| double rl = 3.2406255 * x + -1.537208 * y + -0.4986286 * z; | ||
| double gl = -0.9689307 * x + 1.8757561 * y + 0.0415175 * z; | ||
| double bl = 0.0557101 * x + -0.2040211 * y + 1.0569959 * z; | ||
|
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| r = srgbXYZ2RGBPostprocess(rl); | ||
| g = srgbXYZ2RGBPostprocess(gl); | ||
| b = srgbXYZ2RGBPostprocess(bl); | ||
| } | ||
|
|
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| /** | ||
| * helper function for {@link #srgbXYZ2RGB(double[])} | ||
| */ | ||
| static double srgbXYZ2RGBPostprocess(double c) { | ||
| // clip if c is out of range | ||
| c = c > 1 ? 1 : (c < 0 ? 0 : c); | ||
|
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| // apply the color component transfer function | ||
| c = c <= 0.0031308 ? c * 12.92 : 1.055 * std::pow(c, 1. / 2.4) - 0.055; | ||
|
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| return c; | ||
| } | ||
|
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| /** | ||
| * A multi-lobe, piecewise Gaussian fit of CIE 1931 XYZ Color Matching Functions by Wyman el al. from Nvidia. The | ||
| * code here is adopted from the Listing 1 of the paper authored by Wyman et al. | ||
| * <p> | ||
| * Reference: Chris Wyman, Peter-Pike Sloan, and Peter Shirley, Simple Analytic Approximations to the CIE XYZ Color | ||
| * Matching Functions, Journal of Computer Graphics Techniques (JCGT), vol. 2, no. 2, 1-11, 2013. | ||
| * | ||
| * @param wavelength wavelength in nm | ||
| * @return XYZ in a double array in the order of X, Y, Z. each value in the range of [0.0, 1.0] | ||
| */ | ||
| static void cie1931WavelengthToXYZFit(double wavelength, double& x, double& y, double& z) { | ||
| double wave = wavelength; | ||
|
|
||
| { | ||
| double t1 = (wave - 442.0) * ((wave < 442.0) ? 0.0624 : 0.0374); | ||
| double t2 = (wave - 599.8) * ((wave < 599.8) ? 0.0264 : 0.0323); | ||
| double t3 = (wave - 501.1) * ((wave < 501.1) ? 0.0490 : 0.0382); | ||
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| x = 0.362 * std::exp(-0.5 * t1 * t1) | ||
| + 1.056 * std::exp(-0.5 * t2 * t2) | ||
| - 0.065 * std::exp(-0.5 * t3 * t3); | ||
| } | ||
|
|
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| { | ||
| double t1 = (wave - 568.8) * ((wave < 568.8) ? 0.0213 : 0.0247); | ||
| double t2 = (wave - 530.9) * ((wave < 530.9) ? 0.0613 : 0.0322); | ||
|
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| y = 0.821 * std::exp(-0.5 * t1 * t1) | ||
| + 0.286 * std::exp(-0.5 * t2 * t2); | ||
| } | ||
|
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| { | ||
| double t1 = (wave - 437.0) * ((wave < 437.0) ? 0.0845 : 0.0278); | ||
| double t2 = (wave - 459.0) * ((wave < 459.0) ? 0.0385 : 0.0725); | ||
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| z = 1.217 * std::exp(-0.5 * t1 * t1) | ||
| + 0.681 * std::exp(-0.5 * t2 * t2); | ||
| } | ||
| } | ||
|
|
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| }; | ||
|
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| } //namespace | ||
|
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| #endif |
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