Total Length of an image
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Hello,
Is it possible to upload an image to Matlab and calculate the total length and area?
Thank you
2 Comments
Adam
on 27 Feb 2020
Edited: Adam
on 27 Feb 2020
How do you define the 'length' of an image? Matlab defines it as the longest dimension of an array. If that is what you want then
doc length
gives you that.
When you load an image you get a 2d array so
doc size
will give you its size. Area is trivially calculated from that if all you mean is how many pixels does it have. If you mean the area of some object in the picture that is a whole different question!
Answers (1)
Image Analyst
on 27 Feb 2020
You'd have to do image analysis. This includes image segmentation to get a binary map of the coral alone, then you can either take the area fraction, or skeletonize it with bwskel() and then sum the image . But I'm sure the image segmentation is probably the hardest part, but you chose not to share any images so I'm not sure how tough that would be.
2 Comments
Image Analyst
on 28 Feb 2020
I'm sure by now you've tried what I suggested and have it solved already so go ahead and post your image and code. You probably got something like
binaryImage = imbinarize(grayImage);
area = sum(binaryImage(:))
% If binaryImage doesn't have the object as white on a black background, then do this
% binaryImage = ~imbinarize(grayImage);
skelImage = bwmorph(grayImage, 'skel', inf);
totalLength = sum(skelImage(:))
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