extract rectangular image from scanned image

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AFFY
AFFY 2015-3-28
评论： hamida 2022-12-2
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
output image
>>

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回答（2 个）

Image Analyst
Image Analyst 2015-3-30
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?
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AFFY
AFFY 2015-3-31
Yup but i couldn't extract the image with the help of your code. I tried thresholding, filtering and finding 4 corners in the image to get it rotated but it din't work either.

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Image Analyst
Image Analyst 2015-3-31
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.
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Image Analyst
Image Analyst 2015-3-31
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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