How to calculate the length of the longest crack in this image automatically ?

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wd w
wd w 2024-12-25
评论： wd w 2025-1-10
How to highlight those cracks in this image and calculate their lengths?
  2 个评论
Image Analyst
Image Analyst 2024-12-26
编辑：Image Analyst 2024-12-26
It's complicated by the fact that the really long crack crosses over dark circular regions. Do you consider the crack to end when it hits a round dark region? Or do you want it to continue through it? Please annotate the image with red lines showing exactly where each crack is.

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KALYAN ACHARJYA
KALYAN ACHARJYA 2024-12-29
编辑：KALYAN ACHARJYA 2024-12-29
img = imread('image_crack.png');
% Enhance contrast
enhancedImg = imadjust(grayImg);
% Apply Gaussian filter to reduce noise
smoothedImg = imgaussfilt(enhancedImg, 2);
% Binarize the image using a manually set threshold
binaryImg = imbinarize(smoothedImg,0.32);
%figure, imshow(binaryImg);
%get the highest blob
BW = bwareafilt(~binaryImg,1);
figure,imshow(BW);
Appooximate Only: Now, attempt to use a skeleton-based approach or approximating triangles to determine spatial coordinates and calculate the distances.

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