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167 lines (132 loc) · 4.17 KB
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#include "Comparison.h"
namespace ColorSpace {
double EuclideanComparison::Compare(IColorSpace *a, IColorSpace *b) {
Rgb rgb_a;
Rgb rgb_b;
a->ToRgb(&rgb_a);
b->ToRgb(&rgb_b);
return sqrt(SQR(rgb_a.r - rgb_b.r) + SQR(rgb_a.g - rgb_b.g) + SQR(rgb_a.b - rgb_a.b));
}
double Cie1976Comparison::Compare(IColorSpace *a, IColorSpace *b) {
Lab lab_a;
Lab lab_b;
a->To<Lab>(&lab_a);
b->To<Lab>(&lab_b);
return sqrt(SQR(lab_a.l - lab_b.l) + SQR(lab_a.a - lab_b.a) + SQR(lab_a.b - lab_b.b));
}
Cie94Comparison::Application::Application(Cie94Comparison::APPLICATION appType) {
switch (appType) {
case GRAPHIC_ARTS:
kl = 1.0;
k1 = 0.045;
k2 = 0.015;
break;
case TEXTILES:
kl = 2.0;
k1 = 0.048;
k2 = 0.014;
break;
}
}
double Cie94Comparison::Compare(IColorSpace *a, IColorSpace *b, APPLICATION appType) {
Application app(appType);
Lab lab_a;
Lab lab_b;
a->To<Lab>(&lab_a);
b->To<Lab>(&lab_b);
double deltaL = lab_a.l - lab_b.l;
double deltaA = lab_a.a - lab_b.a;
double deltaB = lab_a.b - lab_b.b;
double c1 = sqrt(SQR(lab_a.a) + SQR(lab_a.b));
double c2 = sqrt(SQR(lab_b.a) + SQR(lab_b.b));
double deltaC = c1 - c2;
double deltaH = SQR(deltaA) + SQR(deltaB) - SQR(deltaC);
double sl = 1.0;
double sc = 1.0 + app.k1*c1;
double sh = 1.0 + app.k2*c1;
deltaL /= app.kl*sl;
deltaC /= sc;
return sqrt(SQR(deltaL) + SQR(deltaC) + deltaH/SQR(sh));
}
double Cie2000Comparison::Compare(IColorSpace *a, IColorSpace *b) {
const double eps = 1e-5;
Lab lab_a;
Lab lab_b;
a->To<Lab>(&lab_a);
b->To<Lab>(&lab_b);
// calculate ci, hi, i=1,2
double c1 = sqrt(SQR(lab_a.a) + SQR(lab_a.b));
double c2 = sqrt(SQR(lab_b.a) + SQR(lab_b.b));
double meanC = (c1 + c2) / 2.0;
double meanC7 = POW7(meanC);
double g = 0.5*(1 - sqrt(meanC7 / (meanC7 + 6103515625.))); // 0.5*(1-sqrt(meanC^7/(meanC^7+25^7)))
double a1p = lab_a.a * (1 + g);
double a2p = lab_b.a * (1 + g);
c1 = sqrt(SQR(a1p) + SQR(lab_a.b));
c2 = sqrt(SQR(a2p) + SQR(lab_b.b));
double h1 = fmod(atan2(lab_a.b, a1p) + 2*M_PI, 2*M_PI);
double h2 = fmod(atan2(lab_b.b, a2p) + 2*M_PI, 2*M_PI);
// compute deltaL, deltaC, deltaH
double deltaL = lab_b.l - lab_a.l;
double deltaC = c2 - c1;
double deltah;
if (c1*c2 < eps) {
deltah = 0;
}
if (std::abs(h2 - h1) <= M_PI) {
deltah = h2 - h1;
}
else if (h2 > h1) {
deltah = h2 - h1 - 2* M_PI;
}
else {
deltah = h2 - h1 + 2 * M_PI;
}
double deltaH = 2 * sqrt(c1*c2)*sin(deltah / 2);
// calculate CIEDE2000
double meanL = (lab_a.l + lab_b.l) / 2;
meanC = (c1 + c2) / 2.0;
meanC7 = POW7(meanC);
double meanH;
if (c1*c2 < eps) {
meanH = h1 + h2;
}
if (std::abs(h1 - h2) <= M_PI + eps) {
meanH = (h1 + h2) / 2;
}
else if (h1 + h2 < 2*M_PI) {
meanH = (h1 + h2 + 2*M_PI) / 2;
}
else {
meanH = (h1 + h2 - 2*M_PI) / 2;
}
double T = 1
- 0.17*cos(meanH - DegToRad(30))
+ 0.24*cos(2 * meanH)
+ 0.32*cos(3 * meanH + DegToRad(6))
- 0.2*cos(4 * meanH - DegToRad(63));
double sl = 1 + (0.015*SQR(meanL - 50)) / sqrt(20 + SQR(meanL - 50));
double sc = 1 + 0.045*meanC;
double sh = 1 + 0.015*meanC*T;
double rc = 2 * sqrt(meanC7 / (meanC7 + 6103515625.));
double rt = -sin(DegToRad(60 * exp(-SQR((RadToDeg(meanH) - 275) / 25)))) * rc;
return sqrt(SQR(deltaL / sl) + SQR(deltaC / sc) + SQR(deltaH / sh) + rt * deltaC / sc * deltaH / sh);
}
const double CmcComparison::defaultLightness = 2.;
const double CmcComparison::defaultChroma = 1.;
double CmcComparison::Compare(IColorSpace *a, IColorSpace *b) {
Lch lch_a;
Lch lch_b;
a->To<Lch>(&lch_a);
b->To<Lch>(&lch_b);
double deltaL = lch_a.l - lch_b.l;
double deltaC = lch_a.c - lch_b.c;
double deltaH = 0;
double f = sqrt(POW4(lch_a.c) / (POW4(lch_a.c) + 1900));
double t = (164 <= lch_a.h && lch_a.h <= 345) ? (0.56 + std::abs(0.2*cos(lch_a.h + 168))) : (0.36 + std::abs(0.4*cos(lch_a.h + 35)));
double sl = (lch_a.l < 16) ? 0.511 : (0.040975*lch_a.l / (1 + 0.01765*lch_a.l));
double sc = 0.0638*lch_a.c / (1 + 0.0131*lch_a.c) + 0.638;
double sh = sc*(f*t + 1 - f);
return sqrt(SQR(deltaL / (defaultLightness*sl)) + SQR(deltaC / (defaultChroma*sc)) + SQR(deltaH / sh));
}
}