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Topic: Fimgerprint orientation field estimation (negative indices)
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Nitin

Posts: 1
Registered: 6/20/13
Fimgerprint orientation field estimation (negative indices)
Posted: Jun 20, 2013 11:35 AM
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Using algorithm mentioned in the paper here https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CDIQFjAA&url=http%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fdownload%3Fdoi%3D10.1.1.106.6655%26rep%3Drep1%26type%3Dpdf&ei=ySDDUejzAo_JrAeQtYDoDg&usg=AFQjCNFW9awru-5mL6Mz0IqYgvGiullxJQ&sig2=TlDzWu8tgovUkiDCKV3ZSw&bvm=bv.48175248,d.bmk

I undertook following steps

1) First divide the normalized image into blocks of size 16*16
2) Find the gradients Gx and Gy at each pixel
3) Estimate the orientation of each block centered at pixel (i,j), but this orientation may
not be always correct due to the presence of noise in the original image so convert
them into vector field.
4) Estimate the smooth orientation field by using 5*5 gaussian fillter.....................

In estimating this orientaion I am getting a problem that the matrix index is starting with negative indices. Can anyone please sort out this problem

Thanks,



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