help me to solve error in integer coding

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izyan hanum 2015-4-25

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评论： Geoff Hayes 2015-4-25

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i dont know why have error in this coding. please help me to solve it

Error using ./ Integers can only be combined with integers of the same class, or scalar doubles.

Error in try1 (line 21) imgN=double(img-min(img(:)))/(max(img(:)-min(img(:))));

%# read image
    img = imread('C:\Users\User\Pictures\N2.jpg');
    %# normalize to 0...1
    imgN = double(img-min(img(:)))/(max(img(:)-min(img(:))));
    th1=graythresh(imgN);
    th2 = graythresh(imgN(imgN>th1));
      cellMsk = imgN>th1;
      nucMsk = imgN>th2;
      figure,imshow(cellMsk+nucMsk,[])

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Geoff Hayes 2015-4-25

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izayn - the problem in the line

imgN = double(img-min(img(:)))/(max(img(:)-min(img(:))));

is that the

double(img-min(img(:)))

is a multi-dimensional array (the same size as your matrix) and is of class/type double. The

(max(img(:)-min(img(:))))

will be a scalar of class/type that is the same as your image. I get the same error if I read an image where each element is a 8-bit unsigned integer. To get around this problem, just cast the right half of the equation to be of double type too. Your equation then becomes

imgN = double(img-min(img(:)))/double(max(img(:)-min(img(:))));

Try the above and see what happens!