Hi, I am the beginer for doing simple image subtration to obtain defect image. Is it possible to make it only show the defect image if nothing difference wont show?

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clc
clear
close all
warning off;
x=imread('origin.jpg');
y=imread('capture.jpg');
[g, c, d]=size(x);
y=imresize(y,[g,c]);
subplot(1,3,1);
imshow(x);
title('origin image');
subplot(1,3,2);
imshow(y);
title('capture image');
subplot(1,3,3);
imshow(x-y);
title('defect occur if difference colour shown');

Accepted Answer

yanqi liu
yanqi liu on 17 Jan 2022
yes,sir
Is it possible to make it only show the defect image if nothing difference wont show?
may be add some judge rule,such as
clc
clear
close all
warning off;
x=imread('origin.jpg');
y=imread('capture.jpg');
[g, c, d]=size(x);
y=imresize(y,[g,c]);
subplot(1,3,1);
imshow(x);
title('origin image');
subplot(1,3,2);
imshow(y);
title('capture image');
bw = find((x-y) > 1);
if numel(bw) > 1
subplot(1,3,3);
imshow(x-y);
title('defect occur if difference colour shown');
end

More Answers (1)

Image Analyst
Image Analyst on 17 Jan 2022
I suggest you use imabsdiff().
diffImage = imabsdiff(x, y);
threshold = 5; % Images must be at least 5 gray levels different to be considered a defect.
mask = diffImage >= threshold;
imshow(mask)
% Get area of defects
props = regionprops(mask, 'Area')
allAreas = [props.Area]
if ~isempty(props)
fprintf('Found %d defect areas.\n', length(props))
else
fprintf('Found no defect areas.\n')
end
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