[SOLVED] Save image in cell array ARRAY{i,y} and access them with image(ARRAY{i,y})?

Hi there!

My system:

Windows 8.1 and MATLAB2015a

My issue: When I save a JPG image in a structure array, in this case stiAll{i,y}

 fileName = strcat('group_',strGr,'_',strVal,'.jpg');
 fileNameStr = char(fileName);
 stiAll{i,y} = imread(fileNameStr);

and I try to retrieve the saved image with image(stiAll(i,y)) I get the following error message from MATLAB:

Invalid datatype for Image CData. Numeric or logical matrix required for image CData.

If I save the image without the {i,y} suffix, so that the image is saved in a normal variable, not in a structure array, I can retrieve the image. However, for my programme I would need to save images in the respective cells of a structure array or something similar.

Any idea how to get this done successfully?

Thanks J

Answer 1

[Azzi Abdelmalek]

   image(stiAll{1,1})

[John Kau]

Thanks Azzi, that works fine!

Answer 2

[Image Analyst]

If you're using braces, you're saying that the variable is a cell array. See http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

A structure is not a cell and a structure array is not a cell array. So don't use braces.

baseFileName = sprintf('group_%s_%s.jpg', strGr, strVal);
fullFileName = fullfile(pwd, baseFileName);
if exist(fullFileName, 'file)
    % File exists.  Add to structure.
    stiAll(i,y) = imread(fullFileName);  
else
    % File does not exist
    message = sprintf('File does not exist:\n%s', fullFileName);
    uiwait(warndlg(message));
end

[John Kau]

Thanks for the explanation, Image Analyst!!