How to measure the length of the particular region?
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Hi, I am new to image processing field and I want to know how to measure the length and width of the particular image using Matlab.
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Von Duesenberg
il 17 Mar 2018
It depends on your goal. If you want the number of pixels, the size of your image in the workspace (with the size function) should give you this info. If you want real world units, you'll have to calibrate your camera: https://fr.mathworks.com/help/vision/ug/camera-calibration.html
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Image Analyst
il 17 Mar 2018
Try this:
[rows, columns, numberOfColorChannels] = size(yourImage);
If you need the lengths in real world units, see my attached spatial calibration demo.
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Image Analyst
il 19 Mar 2018
Wow, I don't know how we were expected to guess that given what you told us first. Anyway, use find
binaryImage = sobelImage > 128; % Or whatever value works.
topRow = find(binaryImage(:, 240), 1, 'first');
bottomRow = find(binaryImage(:, 240), 1, 'last');
leftColumn = find(binaryImage(300, :), 1, 'first');
rightColumn = find(binaryImage(300, :), 1, 'last');
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