- refactored

2022-06-30 13:32:40 +02:00
parent 77cd5261b1
commit 776932e5d1
144 changed files with 0 additions and 38 deletions
@@ -0,0 +1,44 @@
+% function [xyz] = rgb2xyz(rgb)
+% 
+% // C-Code
+% if ( var_R > 0.04045 ) var_R = ( ( var_R + 0.055 ) / 1.055 ) ^ 2.4
+% else                   var_R = var_R / 12.92
+% if ( var_G > 0.04045 ) var_G = ( ( var_G + 0.055 ) / 1.055 ) ^ 2.4
+% else                   var_G = var_G / 12.92
+% if ( var_B > 0.04045 ) var_B = ( ( var_B + 0.055 ) / 1.055 ) ^ 2.4
+% else                   var_B = var_B / 12.92
+%
+% var_R = var_R * 100
+% var_G = var_G * 100
+% var_B = var_B * 100
+%
+% // Observer. = 2°, Illuminant = D65
+% X = var_R * 0.4124 + var_G * 0.3576 + var_B * 0.1805
+% Y = var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722
+% Z = var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505
+%
+% Source http://www.easyrgb.com
+
+function [xyz] = rgb2xyz(rgb)
+[m,n] = size(rgb);
+
+if ((m ~= 3) & (n == 3))
+    rgb = rgb';
+end;
+
+% Observer = 2°, Illuminant = D65
+t_mat = [[ 0.412453  0.357580  0.180423 ]
+         [ 0.212671  0.715160  0.072169 ]
+         [ 0.019334  0.119193  0.950227 ]];
+
+rgb_k = f1(rgb);
+xyz = t_mat * rgb_k;
+
+function rgb_k = f1(rgb)
+thresh_n = 0.04045 ;
+
+[idx_m, idx_n] = find(rgb > thresh_n);
+rgb_k(idx_m,idx_n) = ((rgb(idx_m,idx_n) + 0.055)/1.055).^(2.4);
+
+[idx_m, idx_n] = find(rgb <= thresh_n);
+rgb_k(idx_m,idx_n) = rgb(idx_m,idx_n)/12.92;