How to measure a crack length (using skeleton function)?
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Thomas Bainbridge
le 20 Oct 2020
Commenté : Image Analyst
le 16 Jan 2022
I am trying to calculate the length of the crack (attached) however I can't figure out a way to remove the extra sections of the skeleton that branch off from the main crack path - crackoverlay.png.
Does anyone have any advice as to how I could do this?
clc
clear variables
RGB = imread('crack2.jpg'); % Aquires original image
I = rgb2gray(RGB); % Creates greyscale image
BW = imbinarize(I,'global'); % Binarises it
BW2 = ~(bwmorph(BW,'majority',Inf)); % Fills in holes
BW3 = bwmorph(BW2,'skel',Inf); % Reduces image to center areas of the white sections
BW4 = bwmorph(BW3,'spur',Inf); % Removes spurs
Ov = imfuse(RGB,BW4); % Overlay of original image and skeleton
figure('Name','All_Steps')
subplot(3,2,1), imshow(RGB), title('Original Image')
subplot(3,2,2), imshow(BW) , title('Binarised Image')
subplot(3,2,3), imshow(BW2), title('Binarised Inverted')
subplot(3,2,4), imshow(BW3), title('Skeleton')
subplot(3,2,5), imshow(BW4), title('Simplified Skeleton')
subplot(3,2,6), imshow(Ov), title('Overlay')
4 commentaires
Adam Danz
le 22 Oct 2020
Well done! Perhaps you could share your solution as an answer. I'd be interested in seeing it.
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Jimena López de Uralde Gómez de Olea
le 16 Jan 2022
the script was so helpfull for my program too thanks!!
one question, the units from the path length are pixels?
1 commentaire
Image Analyst
le 16 Jan 2022
Yes, units are pixels. See attached spatial calibration demo and other demos.
Also, you might want to look at bwskel() - I think it has less spurs than bwmorph()
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