求高手用MATLAB写这个程序求a b c 的值（急要）
matlab\u4e2dC=A<=(b&A)+b>2\u7684\u503cMATLAB\u4e09\u79cd\u7c7b\u578b\u8fd0\u7b97\u4f18\u5148\u7ea7
\u7b97\u6570\u8fd0\u7b97>\u5173\u7cfb\u8fd0\u7b97>\u903b\u8f91\u8fd0\u7b97
1\u3001\u8ba1\u7b97b&A=1
\u53d8\u4e3aC=A2
2\u3001\u8ba1\u7b97(1)+b=5
\u53d8\u4e3aC=32
3\u3001\u4ece\u5de6\u5f80\u53f3\u8ba1\u7b97
3<=5 \u8fd4\u56de1
1>2 \u8fd4\u56de0
\u4e5f\u5373\u662fC=0
>> A=3;b=4;
C=A2
C =
0
MATLAB\u4e2d\u6ca1\u6709\u4eceRGB\u5230lab\u7a7a\u95f4\u7684\u76f4\u63a5\u8f6c\u6362\u51fd\u6570\uff0c\u9700\u8981\u81ea\u5df1\u7f16\u8f91\u516c\u5f0f\u3002
imRGB = imread('\u56fe\u50cf\u540d\u79f0');
imRGB\u91cc\u5c31\u5305\u542b\u4e86\u56fe\u50cf\u7684RGB\u503c
\u518d\u5c06RGB\u503c\u8f6c\u6362\u6210LAB\u503c
\u8f6c\u6362\u516c\u5f0f \u7f51\u4e0a\u6709\u4e00\u4e9b\uff0c\u6211\u627e\u5230\u4e86\u4e2a\uff0c\u4f60\u53ef\u4ee5\u53c2\u8003\u4e0b\uff1a
RGB \u2014> XYZ
var_R = ( R / 255 ) //R from 0 to 255
var_G = ( G / 255 ) //G from 0 to 255
var_B = ( B / 255 ) //B from 0 to 255
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\u00b0, 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
XYZ \u2014> Hunter-Lab
(H)L = 10 * sqrt( Y )
(H)a = 17.5 * ( ( ( 1.02 * X ) - Y ) / sqrt( Y ) )
(H)b = 7 * ( ( Y - ( 0.847 * Z ) ) / sqrt( Y ) )
sxy=sum(x.*y);
sx=sum(x);
sy=sum(y);
x2y2=x.^2+y.^2;
abc=[sum(x.^2),sxy,sx;sxy,sum(y.^2),sy;sx,sy,length(x)]*[sum(x.*x2y2);sum(y.*x2y2);-sum(x2y2)];
disp(-abc(1)/2) %abc(1)就是a
disp(-abc(2)/2) %abc(2)就是b
或者这样写(假设x,y都是列向量,这样执行效率更高)：
n=length(x);
L=[x,y,ones(n,1)];
R=diag([1,1,-1])*L'*(x.^2+y.^2);
L=L'*L;
abc=L*R;
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