What is index out of bound ?

Sir i have two files . When i run these codes I get this error.

   duplicate

Attempted to access test(29,258,2); index out of bounds because size(test)=[512,512,1].

Error in duplicate>Segment_Callback (line 337)
            cimg(i,j,2) = test(i,j,2);

Error in gui_mainfcn (line 96)
        feval(varargin{:});

Error in duplicate (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
@(hObject,eventdata)duplicate('Segment_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

What the error means and how can I solve it? It is very urgent.. Can you please help me soon.

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

Answer 1

[Image Analyst]

You're trying to assign the green color channel to another image:

cimg(i,j,2) = test(i,j,2);

but it's not a color image and does not have a second color plane. What you should do if you want to have a color image is this:

[rows, columns, numberOfColorChannels] = size(test);
if numberOfColorChannels == 1
    % It's a gray scale image.  Create a color image from it.
    cimg = cat(3, test, test, test);
else
    cimg = test; % Already RGB, just assign all color channels to cimg.
end

[Prakash Sharma]

Sir where should i put this code? before the for loop or place of cimg(i,j,2)=test(i,j,2)

[Image Analyst]

In place of the whole i,j loop. You obviously can't use that code because it throws an error. My code will not. If you have one with test(i,j,3) get rid of that also.

[Prakash Sharma]

Thank you very much Sir, it worked. I have an extended code related to this. i will be very thankful to u if you kindly help me this time also. these are the codes

I am getting this error

Index exceeds matrix dimensions.

Error in singha>VALIDATE_Callback (line 506) s2 = std2(cimg(:,:,2));

Error in gui_mainfcn (line 96) feval(varargin{:});

Error in singha (line 42) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)singha('VALIDATE_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback