How to detect the crack and calculate the area of crack from this image

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MJ Thangaraj
MJ Thangaraj on 23 Feb 2016
Edited: Walter Roberson on 23 Feb 2016
Code I used
i=imread('road.jpg');
j=rgb2gray(i);
k=imfilter(j,'sobel');
m=edge(j);
imshow(m);
What to do to calculate the area of cracks
Image:

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