I am using a function which gives canny edge filtering of colour image, but i am having image input from gui, so there is error i'm facing at imread of "Input strings must have one row". And how can I show the output image on gui. Please reply.

I = edgecolor(handles.output);

function R=edgecolor(nm)
img=imread(nm);
[x y z]=size(img);
if z==1
    rslt=edge(img,'canny');
elseif z==3
    img1=rgb2ycbcr(img);
    dx1=edge(img1(:,:,1),'canny');
    dx1=(dx1*255);
    img2(:,:,1)=dx1;
    img2(:,:,2)=img1(:,:,2);
    img2(:,:,3)=img1(:,:,3);
    rslt=ycbcr2rgb(uint8(img2));
end
R=rslt;

Answer 1

[Image Analyst]

Put an axes on your GUI, then call imshow(). Also, you messed up the order of the sizes. It should be

[y, x, z] = size(img);

Since the first return argument is the number of rows, which is the height or y size.