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method of making directional image

Question asked by jiya ali in #Coffee Room on Mar 17, 2009
jiya ali
jiya ali · Mar 17, 2009
Rank E1 - BEGINNER
plz if any1 hv idea about direction images .... any research paper link
then plz reply here Posted in: #Coffee Room
jiya ali
jiya ali · Mar 17, 2009
Rank E1 - BEGINNER
i wanna make direction image of figerprint to extract features.. plz kindly help me..
Predictor
Predictor · Mar 17, 2009
Rank D1 - MASTER
jiya ali
i wanna make direction image of figerprint to extract features..
I think that you are interested in edge detection filters which are direction-specific. Sobel filters are among the simpler such filters, and measure the edge in the vertical and horizontal directions separately, and these can be combined to obtain direction (not limited to NSEW) and magnitude measures, as described here:

Sobel filter

There are other filters similar to this, which make separate magnitude measurements for 0, 45, 90 and 135 degrees, only. For example:

Compass Edge Detector


-Will Dwinnell
Data Mining in MATLAB
gohm
gohm · Mar 17, 2009
Rank A3 - PRO
Also be sure to refrain from using sms text in posting

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