Extract foreground object from background

Question

harneet chugga 2016-2-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/267616-extract-foreground-object-from-background

编辑： Image Analyst 2016-2-11

I have 2 images. One is background image and other image has same background but with some foreground object. I want to extract foreground object from background. Simple subtraction operation in matlab will not suffice as it sub

the code below does not give correct output

im1 = imread('foreground.jpg')
im2 = imread('background.jpg')
[m n k]=size(im2);
deltaImage = zeros(m,n,3);
fprintf('%d %d %d.\n',m,n,k);
for l=1:k
    for i=1:m-1
        for j=1:n-1
           if  im1(i:j:l)~=im2(i:j:l)
               deltaImage(i,j,l) = im1(i,j,l);
           end
        end 
    end
end
imshow(deltaImage)

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Image Analyst 2016-2-11

You forgot to attach the images, and to read this and this.

Matt J 2016-2-11

I have marked up your code for you (just this once) to make it more readable.

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Answer 1

Image Analyst 2016-2-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/267616-extract-foreground-object-from-background#answer_209410

编辑：Image Analyst 2016-2-11

在 MATLAB Online 中打开

This is nonsense: (i:j:l). It will work but doesn't do what you thought it would. It goes from i to l in steps of j and is a vector, not a set of 3-D indexes. You don't even need a loop. You can just do

[rows, columns, numberOfColorChannels] = size(im2);
fprintf('%d rows,  %d columns, %d color channels.\n', rows, columns, numberOfColorChannels);
mask = im1 ~= im2;
deltaImage = zeros(rows, columns, numberOfColorChannels);
delta(mask) = im1(mask);

Even with that simplification, the code is not very robust and could be improved, for example to check that the dimensions are the same, to check that mask is not empty, checking for tolerance instead of equality, etc.