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Finding under vehicle undefined object - inspection system

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mehmet irfan gedik
mehmet irfan gedik 2020년 3월 5일
마감: MATLAB Answer Bot 2021년 8월 20일
Hi all,
There are 2 images of a under vehicle recorded with a fisheye lens. How can I detect the undefined object in the 2nd image using the main image (1st image) in Matlab ? In the 2nd image, as I have marked in red, I need to locate the undefined object.
Thanks in advance.


Image Analyst
Image Analyst 2020년 3월 5일
If the images are of the same size, and of the same magnification and fairly well aligned (a doubtful scenario in a real world situation) then you can subtract the images and look for blobs of non-zero. Untested code:
% Get the difference image.
diffImage = imabsdiff(double(image1), double(image2));
% Get the max in any of the color channels
diffImage = max(diffImage, [], 3);
% Threshold to find significant differences.
mask = diffImage > 5; % or some value.
% Throw out any blobs less than 50 pixels in size (they're noise).
mask = bwareaopen(mask, 50);
% Make measurements of area and centroid.
props = regionprops(mask, 'Area', 'Centroid');
allAreas = [props.Area]
centroids = vertcat(props.Centroid)
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Image Analyst
Image Analyst 2020년 3월 5일
Try imresize() and imregister() to align them. If the differences are big then registration may not be necessary, though for tiny differences it would be.

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