%此程序?qū)GB裝換到LUV
%原理是先將圖像由RGB空間變換到CIEXYZ空間，
%再由CIEXYZ空間變換到Luv空間

%作者：Genghis_Yang
%E-mail:?yangcheng2503@163.com

function?[?luv?]?=?rgb2luv（?rgb0?）

[m?n]?=?size（?rgb0?）;
rgb?=?double（?rgb0?）;
luv?=?rgb;

X0?=?（0.607+0.174+0.201）;
Y0?=?（0.299+0.587+0.114）;
Z0?=?（??????0.066+1.117）;

%?Y0?=?1.0?
u20?=?4*X0/（X0+15*Y0+3*Z0）;
v20?=?9*Y0/（X0+15*Y0+3*Z0）;

for?i=1:m
????for?j=1:3:n
????????if?（rgb（ij）<=20）
????????????r=8.715e-4*rgb（ij）;
????????else
????????????r=power（（rgb（ij）+25.245）/280.2452.22）;
????????end

????????if?（rgb（ij+1）<=20）
????????????g=8.715e-4*rgb（ij+1）;
????????else
????????????g=power（（rgb（ij+1）+25.245）/280.2452.22）;
????????end

????????if?（rgb（ij+2）<=20）
????????????b=8.715e-4*rgb（ij+2）;
????????else
????????????b=power（（rgb（ij+2）+25.245）/280.2452.22）;
????????end

????????X?=?0.412453*r?+?0.357580*g?+?0.180423*b;
????????Y?=?0.212671*r?+?0.715160*g?+?0.072169*b;
????????Z?=?0.019334*r?+?0.119193*g?+?0.950227*b;

????????if?（X==0.0?&&?Y==0.0?&&?Z==0.0）
????????????x=1.0/3.0;
????????????y=1.0/3.0;
????????else
????????????den=X+Y+Z;
????????????x=X/den;
????????????y=Y/den;
????????end

????????den=-2*x+12*y+3;
????????u2=4*x/den;
????????v2=9*y/den;

????????if?（Y>0.008856）
????????????luv（ij）=（116*power（Y1.0/3.0）-16）;
????????else
????????????luv（ij）=903.3*Y;
????????end

????????luv（ij+1）=13*luv（ij）*（u2-u20）;
????????luv（ij+2）=13*luv（ij）*（v2-v20）;
????end
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1456??2009-05-15?00:42??rgb2luv.m

-----------?---------??----------?-----??----

?????????????????1456????????????????????1