RGB to Gray function with Matlab code

2011 11 1
2 个回答
回答已采纳
2 次查看（30 天）

0 个投票

hi all , we all know the Matlab belt in rgb2gray ,
i am tring to do it myself ,, here's my function
function out=gray(x)
[p,q,n]=size(x);
%out=uint8(ones(m,n,p));
R=x(:,:,1);
G=x(:,:,2);
B=x(:,:,3);
out=((R+G+B)/3);
and i have this error whn calling gray()
??? Subscript indices must either be real positive integers or logicals.
i don't know what's wrong , if any one know the solution .. Thanx in advance ..

请先登录，再回答此问题。

 采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-11-1

0 个投票

gray() is a MATLAB function too. Do the following to see if there are conflicts.
which gray -all

3 个评论
显示 1更早的评论 隐藏 1更早的评论

jenny mat
jenny mat 2011-11-1
i changed the function name and it goes well but i have this error instead when viewing the resulted image..
g= rgbtogray2(x);
imshow(g)
//Error
??? Index exceeds matrix dimensions.
Error in ==> gray at 6
G=x(:,:,2);
Error in ==> imageDisplayParseInputs at 207
common_args.Map = gray(256);
Error in ==> imshow at 173
[common_args,specific_args] = ...
thanx in advance
Fangjun Jiang
Fangjun Jiang 2011-11-1
You mean you change the name of your own gray() function? Why did the error message still say "Error in ==> gray at 6, G=x(:,:,2);"?
jenny mat
jenny mat 2011-11-1
yes ,, i deleted the old one and it worked very well ..
thanx very much

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson
Walter Roberson 2011-11-1

0 个投票

Chances are you are trying to call gray() from within a routine in which you have a variable named "gray".

类别

在 帮助中心 和 File Exchange 中查找有关 Images 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by