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 PROTECTED]>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. > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/raphael.sebbe%40gmail.com > > This email sent to [EMAIL PROTECTED] > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
