extract rectangular image from scanned image
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I have scanned copies of currency notes from which I need to extract only the rectangular notes. Although the scanned copies have a very blank background, the note itself can be rotated or aligned correctly. I'm using matlab. how do I extract the currency part and get it aligned to the horizontal axis. I have tried using thresholding and canny/sobel edge detection to no avail. I used the below code but it works only for aligned images and not for rotated images.
<< input image
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/148426/image.jpeg)
output image
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/148428/image.jpeg)
>>
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Answers (2)
Image Analyst
on 30 Mar 2015
Did you see my answer to your prior question: http://www.mathworks.com/matlabcentral/answers/182427#comment_271921
Did you look up "registration" in the help and try any of the examples with your image?
Image Analyst
on 31 Mar 2015
I'll be traveling today and not have much time. I'm attaching another demo that uses the radon transform to do rotation. Give that a try.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/175719/image.jpeg)
4 Comments
Image Analyst
on 31 Mar 2015
Then try another method. I'm getting ready to fly to Arizona today and will not have much time to help anyone.
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