hi,

i try to do using two pix_video but only one capture.

i attached the patch.

any idea?

tkz

On Wed, Aug 25, 2010 at 12:19 PM, Jose Luis Santorcuato <santorcuato76@gmail.com> wrote:
Yes, we can, I have three cameras connect only limited by the usb ports, I sometimes use a single gemhead, under it add up how many objects you want, however I prefer to use for monitoring ctrack pidip , pdp libraries, those pd are not in order for windows.

Best regards

José

2010/8/25 IOhannes m zmoelnig <zmoelnig@iem.at>
On 2010-08-24 21:51, Ricardo Brazileiro wrote:
> hi all,
>
> How can I use two webcam in Gem to tracking (pix_blob) ?

use 2 [pix_video] objects.

>
> Is it possible?

yes.

>
> I have two webcam, /dev/video0 and /dev/video1. I tested using pix_video but
> I only change the device in the same window.

the window has nothing to do with either the video grabbing nor the
video analysis.
you can grab video, run [pix_blob] on it and still only see a teapot :-)

anyhow: pix_blob will only ever work on single pixes ("frames").
if you want to use 2 cameras (e.g. to enlargen the viewing angle), you
basically have 2 possibilities:
- merge the two video streams into one, by using whatever compositing
techniques you are easy with. a simple one would be to display both
pixes (probably in a not-displayed [gemframebuffer]), and use [pix_snap]
to grab the composited image). then run whatever analysis you want on
the new big pix.

- do analysis on each stream and then merge the results

gfmasdr
IOhannes


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