Auto backlight management?

[John Watlington]

On Apr 25, 2008, at 8:41 AM, Carl-Daniel Hailfinger wrote:

> On 25.04.2008 06:25, Ivan Krstić wrote:
>> On Apr 24, 2008, at 10:39 PM, Frank Ch. Eigler wrote:
>>
>>> Opportunistic use of the on-board camera and the time-of-day clock
>>> could yield such heuristics.
>>>
>>
>>
>> The camera lights up an LED when enabled, alerting the laptop  
>> operator
>> to its use. This privacy-preserving feature would be rendered
>> ineffective if kids got used to seeing the LED flash on and off every
>> so often as the system autonomously attempts to adjust the backlight.
>>
>
>
> Is there a "warning time" period from activating the LED to activating
> the camera? Just that when someone works in front of the laptop,  
> can he
> simply close it fast enough when the camera light goes on  
> unexpectedly?

No.  There is some integrating of the "camera on" signal, so that  
turning it
on for a single frame should ensure a visible flash, but this has the
opposite effect...

wad