Re: Signature Recognition in Cocoa
Re: Signature Recognition in Cocoa
- Subject: Re: Signature Recognition in Cocoa
- From: Michael Paluszek <email@hidden>
- Date: Sun, 9 Nov 2008 20:28:12 -0500
There is a lot of information available
http://www.ee.bilkent.edu.tr/~signal/defevent/papers/cr2010.pdf
http://code.google.com/p/sigrecnn/
http://www.it.lut.fi/kurssit/03-04/010970000/seminars/Kalenova.pdf
Sincerely,
Mike
On Nov 9, 2008, at 7:14 PM, Pierce Freeman wrote:
As I am not very familiar to signature recognition (as you may have
noticed)
where can I learn how to get the algorithm in code form? Also, are
there
other methods that could get a more precise output?
Thanks,
Pierce F.
On 11/3/08 1:47 AM, "Raphael Sebbe" <email@hidden> wrote:
If you have access to the temporal sequence of events (not just
final image),
DTW (Dynamic Time Warping) could be an easy approach. You would
have to choose
features (pressure, location, speed, acc) with respect to time,
then record a
few "templates" for the reference signature. The output of the DTW
algorithm
is a distance to each template, which you can threshold to tell OK,
NOT TOO
FAR, DIFFERENT.
To get input to that algorithm in Cocoa, well, an NSView subclass +
handling
events, I guess.
Raphael
On Mon, Nov 3, 2008 at 3:14 AM, Pierce Freeman <email@hidden
>
wrote:
I have been looking at various open source projects/sites but
still
can't find a way to check two signatures to see if they are the
same in
Cocoa. For example: On setup, "User A" writes his name on his
tablet, then
"User B" tries to sign in using an imitation signature, but it
will return
an warning message instead of doing the task. I have read a few
articles,
but can't make any sense out of how to use the information in
Cocoa. If
anyone could tell/point me to any information of the best way to
do this in
Cocoa, it would be great.
Pierce F.
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Michael Paluszek
Princeton Satellite Systems
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