Re: VS: VS: VS: VS: Separating fields from interlaced images.

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On Fri, 11 Oct 2002, Joni Kahara wrote:

> > > A manual switch? Could you draw an ASCII-pr0n diagram of your setup?
> > > This is somewhat puzzling.. how do you get two images simultaneously?
> > >
> >
> > These 2 cameras are connected to a "Sync" unit (that is what the manual
> > syas). I donot know how the Sync unit works, there is no further
> > documentation.
> > Apparently the Sync unit grabs from the 2 cameras and combines the data
> > into a single image. Then it sends it to /dev/video0 (that is the only
> > active video device in the system). The (manual) switch is just an
> > accessory, if one wants to work only with one camera.
> >
> 
> M-kay.. so it's a digital processor. You can separate the fields quite
> easily by copying every second line. This of course involves as many
> memcpy()s as there are lines in a field.
> 
> Or process them in the buffer, no copying involved.
> 
> You can tell the driver to give you odd or even field only, I think.
> But then you would only get the other cam, and you want them both,
> right? It's a stereocamera?
> 
We tried doing this, ie, separating the odd and even lines from the 
grabbed image. But doesnot seem to work. Probably it is something else.
Using V4L can we separate the fields? If you want i can attach a sample 
image.

Mohan Raj





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