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Thumbprint Gabor Filtering, Orientation Map and Normalization

asked 2017-07-11 14:22:58 -0500

phillity gravatar image

updated 2018-03-30 00:15:25 -0500

Hi everyone,

I have been working through the steps of fingerprint matching presented in an answer here: http://answers.opencv.org/question/63...

Some of the links provided in the answer are now dead and I cannot find examples online. I have figured out how to perform some steps, but there are a few I am struggling with.

For the blockwise gabor filtering, can someone provide me an example or the parameters I should use? (All the images I am using are size 388x374)

EDIT:

I have begun working on this again and made some progress. I have obtained the orientation map. I think there should be some way to improve my results though, as they don't seem as good as the result in the referenced answer.

Currently, I first perform CLAHE to increase image contrast. Then, I am obtaining the gradient magnitude and direction for each pixel. Next, I split the image into non-overlapping windows. I average the directions within each window to find the local direction for the windows and plot a corresponding lines. Is there some improvement I can make to this process to better my results? Is this the correct way to get "block-wise gradient direction" as the referenced answer states?

My next step will be to enhance the image using block-wise gabor filters. Should they be applied to each window using the window's average direction I found? Can anyone further explain the answer's step: "Enhance the normalize image by block-wise gabor filter according to block-wise orientation map then binarize the fingerprint"

Any tips will be very appreciated!

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answered 2018-03-31 02:21:43 -0500

phillity gravatar image

I ended up reading these two A.K. Jain papers: 1 and 2

Then I translated and modified the parts of the matlab code here. The code is based on the second paper, but I was able to add some steps from the first paper to enhance my results.

Hope those links help someone!

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seing your final opencv code for this would be nice !

berak gravatar imageberak ( 2018-03-31 03:48:14 -0500 )edit

Can you please provide the code?

leo_9223 gravatar imageleo_9223 ( 2018-08-08 06:30:05 -0500 )edit
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Asked: 2017-07-11 14:22:58 -0500

Seen: 623 times

Last updated: Mar 31 '18