public class CIEDE2000ColorDistance {
public static void main(String[] args) {
// 예시 색상 A와 B
double[] colorA = { 53, 80, 678 }; // L*, a*, b* values for color A
double[] colorB = { 86, -40, -22 }; // L*, a*, b* values for color B
// CIEDE2000 거리 계산
double distance = calculateDeltaE(colorA, colorB);
System.out.println("CIEDE2000 거리: " + distance);
}
/**
* lab1과 lab2 색상 거리 비교
* @param lab1
* @param lab2
* @return
*/
public static double calculateDeltaE(double [] lab1, double[] lab2) {
return calculateDeltaE(lab1[0],lab1[1],lab1[2],lab2[0],lab2[1],lab2[2]);
}
public static double calculateDeltaE(double L1, double a1, double b1, double L2, double a2, double b2) {
double Lmean = (L1 + L2) / 2.0;
double C1 = Math.sqrt(a1*a1 + b1*b1);
double C2 = Math.sqrt(a2*a2 + b2*b2);
double Cmean = (C1 + C2) / 2.0;
double G = ( 1 - Math.sqrt( Math.pow(Cmean, 7) / (Math.pow(Cmean, 7) + Math.pow(25, 7)) ) ) / 2;
double a1prime = a1 * (1 + G);
double a2prime = a2 * (1 + G);
double C1prime = Math.sqrt(a1prime*a1prime + b1*b1);
double C2prime = Math.sqrt(a2prime*a2prime + b2*b2);
double Cmeanprime = (C1prime + C2prime) / 2;
double h1prime = Math.atan2(b1, a1prime) + 2*Math.PI * (Math.atan2(b1, a1prime)<0 ? 1 : 0);
double h2prime = Math.atan2(b2, a2prime) + 2*Math.PI * (Math.atan2(b2, a2prime)<0 ? 1 : 0);
double Hmeanprime = ((Math.abs(h1prime - h2prime) > Math.PI) ? (h1prime + h2prime + 2*Math.PI) / 2 : (h1prime + h2prime) / 2);
double T = 1.0 - 0.17 * Math.cos(Hmeanprime - Math.PI/6.0) + 0.24 * Math.cos(2*Hmeanprime) + 0.32 * Math.cos(3*Hmeanprime + Math.PI/30) - 0.2 * Math.cos(4*Hmeanprime - 21*Math.PI/60);
double deltahprime = ((Math.abs(h1prime - h2prime) <= Math.PI) ? h2prime - h1prime : (h2prime <= h1prime) ? h2prime - h1prime + 2*Math.PI : h2prime - h1prime - 2*Math.PI);
double deltaLprime = L2 - L1;
double deltaCprime = C2prime - C1prime;
double deltaHprime = 2.0 * Math.sqrt(C1prime*C2prime) * Math.sin(deltahprime / 2.0);
double SL = 1.0 + ( (0.015*(Lmean - 50)*(Lmean - 50)) / (Math.sqrt( 20 + (Lmean - 50)*(Lmean - 50) )) );
double SC = 1.0 + 0.045 * Cmeanprime;
double SH = 1.0 + 0.015 * Cmeanprime * T;
double deltaTheta = (30 * Math.PI / 180) * Math.exp(-((180/Math.PI*Hmeanprime-275)/25)*((180/Math.PI*Hmeanprime-275)/25));
double RC = (2 * Math.sqrt(Math.pow(Cmeanprime, 7) / (Math.pow(Cmeanprime, 7) + Math.pow(25, 7))));
double RT = (-RC * Math.sin(2 * deltaTheta));
double KL = 1;
double KC = 1;
double KH = 1;
double deltaE = Math.sqrt(
((deltaLprime/(KL*SL)) * (deltaLprime/(KL*SL))) +
((deltaCprime/(KC*SC)) * (deltaCprime/(KC*SC))) +
((deltaHprime/(KH*SH)) * (deltaHprime/(KH*SH))) +
(RT * (deltaCprime/(KC*SC)) * (deltaHprime/(KH*SH)))
);
return deltaE;
}
}
참고자료