Image processing for crack detection and length estimation

Hi,

I have written the following matlab code to do the following:-

• load rgb image of surface
• contrast stretch
• convert rgb to gray scale
• image segmentation
• morphological operations (thin, clean , fill, etc…)
• imtool for pixel length determination
• Calculation of crack length based on calibration of image and above determined pixel lenght.

My aim is to develop the SIMPLEST matlab code for automatic detection of cracks and estimate the length of the crack (if possible other geometrical properties) from a sample image.

The code is shown below:

%%load image

I=imread('two.jpg');
figure,imshow(I)
title('Original image')
%%Image adjust 
Istrech = imadjust(I,stretchlim(I));
figure,imshow(Istrech)
title('Contrast stretched image')
%%Convert RGB image to gray
Igray_s = rgb2gray(Istrech);
figure,imshow(Igray_s,[])
title('RGB to gray (contrast stretched) ')
%%Image segmentation by thresholding
%use incremental value to run this selection till required threshold 'level' is          
%achieved
level = 0.08;
Ithres = im2bw(Igray_h,level);
figure,imshow(Ithres)
title('Segmented cracks')
%%Image morphological operation
BW = bwmorph(gradmag,'clean',10);
figure,imshow(BW)
title('Cleaned image')
BW = bwmorph(gradmag,'thin', inf);
figure,imshow(BW)
title('Thinned image')
BW = imfill(gradmag, 'holes')
figure,imshow(BW)
title('Filled image')
%%Image tool
figure,imtool(BW1)
figure,imtool(I)
%%Calaculate crack length
calibration_length=0.001;   
calibration_pixels=1000;
crack_pixel=35;
crack_length=(crack_pixel *calibration_length)/calibration_pixels;

Please, I need help from image specialist to improve the code from above to meet my aim. I have also attached a sample picture that I am using for this code.

NOTE:-

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You’re just arbitrarily setting

crack_pixel=35;

You’re not even doing it manually (with user assistance) — you’re just setting some arbitrary number. What’s up with that? If you need code to find the distance between the farthest points in a binary blob, see my demo .

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
imtool close all;  % Close all imtool figures if you have the Image Processing Toolbox.
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 18;

% Check that user has the Image Processing Toolbox installed.
hasIPT = license('test', 'image_toolbox');
if ~hasIPT

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Image processing for crack detection and length estimation

Image processing for crack detection and length estimation