Re: Video capture or image sensor suggestions
- From: paul$@pcserviceselectronics.co.uk (Paul Carpenter)
- Date: Sun, 31 Jul 2005 21:52:04 +0100 (BST)
On 31 Jul, in article
<1122819242.732382.109840@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
larwe@xxxxxxxxx wrote:
>I've been doing some extremely basic machine vision experiments for a
>while, using STV0680-based USB cameras attached to Linux boxes.
>
>I now want to experiment with IR-illuminated subjects, but the cheap
>webcams I've been using are color cameras with IR filters.
>
>Can someone recommend a Linux-supported USB video capture device that
>accepts regular NTSC input and provides at least 320x240 @ 7.5fps? With
>one of these I can use a cheapo B&W camera with good IR response.
There are lots of video to USB devices about, but I doubt many have Linux
support you could try a cheap frame grabber board if you have a spare PCI
slot as people like Sensoray make one with Linux drivers
<http://www.sensoray.com/html/611data.htm>
Avoids the USB bottleneck and allows video camera direct to card in PC.
ordereable even online for $175 in one offs. Can do composite or
monochrome NTSC/PAL upto four inputs.
They also make a PC/104+ format version.
Frame rate depends on when you take the images.
If however this is a single board Linux with USB and no PCI, all bets are
off.
>Alternatively, I could see my way to constructing some custom optics
>and lashing a bare digital image sensor directly to one of the other
>pieces of hardware in the system. But in this case I would need a
>recommendation for a sensor chip that is:
>
>a) available (!!)
Aren't the Comedia serail cameras easily available and low cost, but
serial? I have not checked but that might get you the frame rate you
require with a RS232/USB converter as well.
>b) in a prototypable package (LCC is OK, but these weird packages that
>have to be fused onto the board are NOT OK).
The main people I use are (unfortunately) Omnivision and Sony.
>The Omnivision OV07141-C01A or -P01A might be ideal but they are
>impossible to buy.
They were easily available in the UK when I last looked. If you think
Omnivision are difficult try Sony!
However have you looked at
<http://www.micron.com/products/imaging/products/vga.html>
<http://www.st.com/stonline/products/selector/43.htm>
Others like Kodak and Mitsubishi are usually for those with much
deeper pockets.
--
Paul Carpenter | paul@xxxxxxxxxxxxxxxxxxxxxxxxxxx
<http://www.pcserviceselectronics.co.uk/> PC Services
<http://www.gnuh8.org.uk/> GNU H8 & mailing list info
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