| Re: Read info from webcam video [message #181899 is a reply to message #181888] |
Fri, 21 June 2013 14:53   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
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On 6/20/2013 10:31 PM, Peter H. Coffin wrote:
> On Thu, 20 Jun 2013 19:14:15 -0400, Norman Peelman wrote:
>> As long as he can grab the images from the cam via php (requires that
>> the IP camera has an internal server) then it is quite easily done. As
>> Jerry's response dictates. Examine the images looking for the tell-tale
>> LED.
>
> And checking against previous images to see if they were off, and
> selecting the appropriate image somehow to make the comparison with. And
> it'll be especially fun if the camera's not set someplace where the LED
> fills the entire sensor area...
>
Of course. Any time you're looking for a change in any data, you must
compare old data against new. But if you know where in the frame the
LED is located, testing is easy. It does not need to fill the entire
frame - just a few pixels (theoretically 1 pixel would be enough, but I
suspect that would be more susceptible to falsing).
--
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Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
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