[sldev] Anyone here with OpenCV experience?

[Dahlia Trimble]

I imagine time and testing will weed out the optimal solution. :)
Best regards,
-dahlia

On Thu, May 21, 2009 at 3:57 PM, Jan Ciger <jan.ciger at gmail.com> wrote:

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> Dahlia Trimble wrote:
> > Overkill? I'm not so sure. Consider the extreme variations in contrast
> > that something like this would be exposed to out in the field. Lighting
> > is uncontrolled and unpredictable. A major source of light on a user's
> > face may well come from the image shown on the monitor, and may reflect
> > off of the user's glasses. Facial features are variable and skin tone,
> > eyebrow color, and other facial hair could further confuse any detection
> > methods. Background lighting and objects other than the user could cause
> > false detections. Also the camera could not be controlled, Could one
> > reasonably expect users to purchase a standard webcam from a single
> > vendor when many computers come with integrated webcams?
>
> No, but that isn't the point. It doesn't need to be 100% perfect and
> robust - even the Logitech's solution is not. And yes, actually most of
> the lighting in an average room is stable - and can be compensated for.
> For example, the paper I have sent the link to deals with the lighting
> issues by calibration - it takes a picture of a skin patch (your face)
> and uses that to create a model of your skin color. That compensates for
> all the skin and lighting issues, even lot of camera parameters.
>
> An actual application would probably build a background model too to
> make the detection more robust. Again, a rather simple task.
>
> >
> > Somehow I don't think simple methods demonstrated that in a lab
> > environment will perform well at all given all these potential confounds
> > in all user environments. Whatever is implemented would need to be
> > subjected to extensive user testing if any kind of wide acceptance would
> > be desired.
>
> Sony is doing a brisk business with their hugely popular EyeToy series
> that is using these simple algorithms that you believe do not work. Do I
> need to say more?
>
> Regards,
>
> Jan
>
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