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Fingerprint orientation map

asked 2013-03-17 13:06:40 -0500

Milanista gravatar image

Hello. I'm working with fingerprints in openCV c++ and I need to make an orientation map like this:

image description

Could you help me how to do it? I would greet some code,too :)

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answered 2013-03-17 13:56:15 -0500

What you basically are telling us is that you probably have a school assignment to implement this stuff on your computer and you want us to provide you with a solution. Because I think that people learn more by actually trying, I will set you on the right way.

The orientation map is created by looking at the rough surface of the finger. You want to create a representation of the most specific edges in the image.

So have a look into edge detection algorithms:

After you have segmented out edges, create a binary image from that. You could use the binary image to match linear Hough Transforms to detects lines, straight parts and see if that gets you anywhere.

http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/hough_lines/hough_lines.html#hough-lines

Try some stuff out and report back with questions.

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Thank you! I just started to make this part of my program today, I was just stuck a bit with it. I tried some of the things you wrote, so I must be on the correct way. Tomorrow I will continue and I hope I will find the solution. Thanks for the good answer :)

Milanista gravatar imageMilanista ( 2013-03-17 14:27:34 -0500 )edit
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You are welcome. Feel free to accept the answer if it actually solves your problem :)

StevenPuttemans gravatar imageStevenPuttemans ( 2013-03-17 14:35:54 -0500 )edit

with this I can't see how it is possible to get an orientation map

nar6du14 gravatar imagenar6du14 ( 2016-04-19 13:51:17 -0500 )edit

A edge filter gives you an orientation and a size. You just have to average over bins.

StevenPuttemans gravatar imageStevenPuttemans ( 2016-04-20 03:33:41 -0500 )edit
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Asked: 2013-03-17 13:06:40 -0500

Seen: 1,069 times

Last updated: Mar 17 '13