Hello
If your webcam is based on SAA8116 chip, you can use external
synchronization input - pin V number 96. To use this input you have to
switch it from output to input mode by modifying bits 2 and 3 of
register PIN_CONFIG_1 (address 0x7F). Read SAA8116 datasheet for
further details. You can use wcrmac utility for this purpose, this
register is mapped to EEPROM's 0x17F.
I tried connecting two webcams - first webcam SAA8116 V pin serving as
output to second webcam SAA8116 V ping serving as input, but resulting
image was moving horizontally and changing colours. I checked
different settings of PIN_CONFIG_1 bits 2 and 3, all without luck.
Probably the necessary input signal is somehow different from output
signal on this pin. Both cameras survived this amateur neurosurgical
operation without any damage.
Let me know if you succeed, I'm quite interested in webcam synchronization.
Regards
Stanislaw Szymczyk
On 6/1/07, Björn Annighöfer <> wrote:
> Hi,
>
> I am trying to to synchronize two webcams so that the delay between two
> images taken by the cams becomes as small as possible. From experiments
> I see that the delay of the two cams is far from beeing constant. So my
> idea was it to build feedback control loop that whenever the time
> difference gets to big I delay one cam a little bit, to get the ime
> difference smaller again.
>
> So far I found no way to delay the capturing of cam just al little bit.
> I tryied just to skip a frame in one cam but that has no effect (I think
> because the camera internaly follows it's fixed rate).
>
> Any ideas?
>
> Thanks Björn
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