Try indexing:
[rows, columns] = size(ca)
for col = 1 : columns
for row = 1 : rows
thisCellContents = ca{row, col};
upperLeftPixelValue = thisCellContents(1,1);
% Now do something with upperLeftPixelValue -- process it somehow.
end
end
It looks like you never read the FAQ, so go here for a good description of how cell arrays work and when to use braces, brackets, or parentheses.
