[PD] Installation with GEM

IOhannes m zmoelnig zmoelnig at iem.at
Mon Apr 25 13:51:21 CEST 2005

Malte Steiner wrote:
> Hello
>> Two cameras would send their frames to two image stacks which contain 
>> say 30 frames (the more the better).
>> The actual frame is subtracted from the last one and the resulting 
>> frame of this simple kind of movement-dedection would serve as a 
> should be possible with stock GEM modules, I did an simular installation 

> with pix buffering and subtraction etc, but a single usb cam.
if you just want to get some simple movement detection there is 
[pix_movement] (and [pix_movement2] which does exactly that: subtract to 
(or more) subsequent (if this is the correct word) frames; so no need to 
  get into the strangeness of [pix_buffer]...

> My only concern is connectig 2 cameras, I believe that this gives 
> trouble with any modules but I would like to be proven wrong.

i am not sure about osX (Gem either tries to grab the first available 
device, which would be ok; or the first listed device (which would 
reduce your options to one camera)
on linux i have worked with several cameras within one Gem-patch, there 
is something like a "device" message.


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