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July 14, 2004, 2:32 am
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Re: Motion Detector
> I just wonder if anyone come across any "motion detector" software,
> preferably written in Perl, to be used by webcams or cctv-cameras.
Ricky, check for significant changes in contrast
or color from one frame to the next, significant
enough to not be a false positive caused by
angular changes in sunlight over a long series
An example is a twenty-five percent darkening through
gamma correction will decrease a file size by an
average thirty-three percent. This will vary greatly
depending on gray scale versus color and on base color
I would not expect to capture a mouse in motion nor
a very slow moving stealthy cat on the hunt. A good
example of this is infrared motion detectors can be
easily defeated by simply moving very slowly through
the edge of an infrared device vision field.
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