Re: Signature Recognition in Cocoa
Re: Signature Recognition in Cocoa
- Subject: Re: Signature Recognition in Cocoa
- From: Pierce Freeman <email@hidden>
- Date: Sun, 09 Nov 2008 16:14:27 -0800
- Thread-topic: Signature Recognition in Cocoa
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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