background removal

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siddharth s
siddharth s 2011-8-3
i have a pavement image with a crack. i would like to remove the background of that image.so that i can get a clear picture of the crack.I don't have the image of the pavement without crack.So,i cant use the subtract method to remove the background.Is there any other way to remove the background.can any one help me out.
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Ashish Uthama
Ashish Uthama 2011-8-3
Siddharth, posting a sample image would help you get a better answer.

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Image Analyst
Image Analyst 2011-8-3
You could just blur the heck out of it with conv2(). Or else use the image to model a perfectly smooth function, like a quadratic or something. I used polyfitn for this but John removed it from the File Exchange. Maybe you could try this instead: http://www.mathworks.com/matlabcentral/fileexchange/13719-2d-weighted-polynomial-fitting-and-evaluation
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Karan
Karan 2012-8-16
Could you share what exactly you did because I have exactly the same problem. Thanks
Image Analyst
Image Analyst 2012-8-16
Where did you post your image? I think you should start your own thread on your own question and image.

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Ashish Uthama
Ashish Uthama 2011-8-3
You might also consider extracting the crack instead of removing the background :) What do you intend to do after you 'remove the background' ?
You might be able to use functions like edge to detect and process the edge.
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siddharth s
siddharth s 2011-8-3
i tried extracting the crack using edge detection method but it displays all edges which are not a part of the crack. can u suggest something for extracting the crack alone
Walter Roberson
Walter Roberson 2011-8-3
We need a sample image.
http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

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