matlab程序绘制CIE1976色品图的程序
时间: 2023-12-14 20:02:30 浏览: 33
您可以尝试以下代码:
```matlab
clc;
clear all;
close all;
%%
lambda = 380:1:780; %波长范围
x = zeros(1, length(lambda));
y = zeros(1, length(lambda));
z = zeros(1, length(lambda));
%接下来是三个基函数
x = ((lambda>= 380)&(lambda<450)).* (-(lambda-645)/(645-495)) + ((lambda>=450)&(lambda<495)).*(0) + ((lambda>=495)&(lambda<570)).*((lambda-495)/(570-495)) + ((lambda>=570)&(lambda<590)).*(1) + ((lambda>=590)&(lambda<645)).*((-1)*(lambda-645)/(645-590)) + ((lambda>=645)&(lambda<=780)).*(0);
y = ((lambda>= 380)&(lambda<450)).*(0) + ((lambda>=450)&(lambda<495)).*((lambda-450)/(570-450)) + ((lambda>=495)&(lambda<570)).*(1) + ((lambda>=570)&(lambda<590)).*((-1)*(lambda-590)/(590-570)) + ((lambda>=590)&(lambda<645)).*(0) + ((lambda>=645)&(lambda<=780)).*(0);
z = ((lambda>= 380)&(lambda<450)).*((lambda-380)/(420-380)) + ((lambda>=450)&(lambda<495)).*((lambda-450)/(570-450)) + ((lambda>=495)&(lambda<570)).*(0) + ((lambda>=570)&(lambda<590)).*(0) + ((lambda>=590)&(lambda<645)).*((lambda-645)/(780-645)) + ((lambda>=645)&(lambda<=780)).*(0);
% normalize the vectors
x = x / max(x);
y = y / max(y);
z = z / max(z);
% WLw = 4700; % 白点 D65
WLw = 6504; % 白点 D50
Xn = 0.9505;
Yn = 1.0;
Zn = 1.089;
Yw = (Yn*WLw/zenergies(1, 2))/(1.0*WLw/zenergies(1, 3)+1.0*WLw/zenergies(1, 1)+15.0*WLw/Yn);
Xw = Yw * (Xn / Yn);
Zw = Yw * (Zn / Yn);
%% 计算相应刺激值
XYZ = zeros(3,length(lambda));
XYZ(1,:)=x;
XYZ(2,:)=y;
XYZ(3,:)=z;
% 根据白点计算Lab值
xyzw = XYZ * [Xw;Yw;Zw];
Lw = 116 * Fxyz(xyzw(2)) - 16;
aw = 500 * (Fxyz(xyzw(1))-Fxyz(xyzw(2)));
bw = 200 * (Fxyz(xyzw(2))-Fxyz(xyzw(3)));
XYZ_w = XYZ * [Xw; Yw; Zw];
L = 116 * Fxyz(XYZ_w(2,:)) - 16;
a = 500 * (Fxyz(XYZ_w(1,:))-Fxyz(XYZ_w(2,:)));
b = 200 * (Fxyz(XYZ_w(2,:))-Fxyz(XYZ_w(3,:)));
% Calculate the chromaticity coordinates
u = 4*X ./ (-2*X + 12*Y + 3);
v = 9*Y ./ (-2*X + 12*Y + 3);
% 计算色度坐标
up = 4 * X / (X + 15*Y + 3*Z);
vp = 9 * Y / (X + 15*Y + 3*Z);
% Plot the color locus
figure(1);
plot(u, v, 'k-', 'LineWidth', 2);
hold on;
plot(u(1), v(1), 'ro', 'MarkerSize', 8, 'LineWidth', 2);
plot(u(end), v(end), 'bo', 'MarkerSize', 8, 'LineWidth', 2);
xlabel('u');
ylabel('v');
set(gca, 'FontSize', 14);
axis([0.15 0.63 -0.1 0.7]);
grid on;
title('色品图')
% 标注颜色
figure(2);
scatter(a,b,3*L,XYZ_w','filled');
axis equal;
hold on;
scatter(aw,bw,'k', 'filled');
text(aw,bw,' White point');
xlabel('a*');
ylabel('b*');
title('色彩图,在此处 L* 是尺度,即颜色的明暗度');
grid on;
function fy=Fxyz(x) %定义三个色度基函数
if x>(6/29)^3
fy=x^(1/3);
else
fy=(1/3)*((29/6)^2)*x+(1/3);
end
end
```
希望能对您有所帮助!