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Video capture with Linux?

Last response: in Graphics & Displays
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February 10, 2005 7:52:51 AM

Archived from groups: rec.video.desktop (More info?)

For an underwater robot application, the plan is to capture video at 88x64
pixels on Linux. This feeds into a high speed algorithm so there cannot be
delay in scaling the image down to size. Either it should be this size
natively, or fast scaling performed on the card hardware. What would be the
best video capture card and driver to use on Linux for this purpose?

More about : video capture linux

Anonymous
February 10, 2005 5:32:36 PM

Archived from groups: rec.video.desktop (More info?)

On a sunny day (Thu, 10 Feb 2005 04:52:51 GMT) it happened "DD"
<dontsendhere@nospam.com> wrote in
<DMBOd.3456$aW6.2627@newssvr22.news.prodigy.net>:

>
>
>For an underwater robot application, the plan is to capture video at 88x64
>pixels on Linux. This feeds into a high speed algorithm so there cannot be
>delay in scaling the image down to size. Either it should be this size
>natively, or fast scaling performed on the card hardware. What would be the
>best video capture card and driver to use on Linux for this purpose?

Strange question....
You will likely have trouble finding a CCD or CMOS sensor that is exactly 88x64.
There are plentty of 'robots' with CMOS sensor on the web, that for example
use a small microcomputer (PIC, AVR, whatever) to do signal procession (like
folow a specific colored area etc..).
In most if not all cases standard sensors are used.
There is not so much processing power needed to average over say x*y pixels.
In all cases the guys write their own soft (in asm or C).
So this assumes there is some hardware with the sensor (underwater in you case).
If you are not in electronics etc.. then the only real option is to use a
standard CCD or CMOS camera, perhaps with composite out, and do processing
'above water' in a normal PC.
In THAT case you could use any video digitzer (but this requires a powerful PC).
You do not say how deep, temperature... power available.. for 2 meter a USB
webcam would work perhaps.
A embedded controller board with enough resources to run Linux (underwater)
will set you back a bit.
So, be a bit more precise about what you want to achieve, so a more specific
solution (or perhaps totally different) can be proposed.
Anonymous
March 11, 2005 7:28:27 PM

Archived from groups: rec.video.desktop (More info?)

Q. if you are capturing 88x64 .. what need is there to scale it down? Can
you clarify?
"DD" <dontsendhere@nospam.com> wrote in message
news:D MBOd.3456$aW6.2627@newssvr22.news.prodigy.net...
> For an underwater robot application, the plan is to capture video at 88x64
> pixels on Linux. This feeds into a high speed algorithm so there cannot
> be delay in scaling the image down to size. Either it should be this size
> natively, or fast scaling performed on the card hardware. What would be
> the best video capture card and driver to use on Linux for this purpose?
>
>
!