Error in blkproc function

the following code is used by me

y=imread('index.jpg');

b=blkproc(y,[2 2],@(x)min(min(x)));
whos b

It reports An error:

??? Subscripted assignment dimension mismatch.

Error in ==> blkproc at 89
aa(border(1)+(1:ma),border(2)+(1:na)) = a;

Error in ==> prog1 at 3
b=blkproc(y,[2 2],@(x)min(min(x)));

I am unable to get rid of that error.. PLS help me

Answer 1

[Walter Roberson]

Please check whether your "y" is 2 dimensional (a grayscale image) or 3 dimensional (a truecolor image).

JPEG files cannot store indexed images so we know that y cannot be 2 dimensional representing color.

If y is 3 dimensional then your min(min()) is going to return a vector rather than a scalar.

[Jagadeesh p]

Thank u so much.It is working for gray images but i have considered rgb image ie "index.jog"..it is showing error which i mentioned above. Can u pls help me out

[Jagadeesh p]

***'index.jpg'

[Walter Roberson]

b=blkproc(y,[2 2],@(x)min(x(:));