[pwc] Image whiteout following the night -> day transition

Hi.

I'm using philips webcams in night/daylight environment and they sometimes
exhibit 'whiteout' following the night -> day transition.

This appears to occur when the light level _gradually_ increases from dawn
onwards but the webcam does not automatically adjust to compensate for the
increase in light level.

I've used the following cameras with the results as indicated:

Philips PCVC675K (Vesta)           NO PROBLEM
Philips PCVC680K (Vesta Pro)       NO PROBLEM
Philips PCVC840K (ToUcam Pro II)   WHITEOUT
Philips SPC900NC                   WHITEOUT


I'm currently using the following combinations

( motion 3.2.2, pwc 10.0.8, linux 2.6.13-1.1532_FC4 + PCVC675K & SPC900NC )
( motion 3.2.3, pwc 10.0.11, linux 2.6.14-1.1644_FC4 + PCVC840K )

The frame rate is set to 10fps

If I stop Motion and restart, the webcam adjusts back to the daylight level.

How can I trigger the webcams to adjust to the light level without
stopping and restarting motion every time.?

Is there a way to get PWC to trigger this adjustment automatically?

kind regards


Chris




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