Hello, Anyone can point me to a source where I can learn how to read and capture video signals from one of those pinpole color camera into a C6711 DSK? Like what type of A/D hardware I need and what the signal scheme is like?
Video sampling
Started by ●July 31, 2004
Reply by ●July 31, 20042004-07-31
"Peter Choi" <choi@mecca.ca> wrote in message news:6RFOc.142047$Mr4.44404@pd7tw1no...> Hello, > > Anyone can point me to a source where I can learn how to read and capture > video signals from one of those pinpole color camera into a C6711 DSK?Like> what type of A/D hardware I need and what the signal scheme is like?Peter, I know what a "pinhole" still camera is. But, I don't generally think of pinhole cameras and video together. I suppose it's because the "exposure" time is long for a pinhole camera and won't support a video frame rate. Unless you have a dynamite sensor! It all gets to what the sensor is anyway. Google results in nothing for pinpole color camera. What you need to reveal is: the video format that's coming out of the camera. NTSC, RGB ....... there are many signal schemes for camera outputs. But, you didn't really say "video" did you? If it's still images you need to capture then the A/D converter board is often referred to as a "frame grabber". Same issue though ... regarding the image format coming out of the camera. Fred
Reply by ●July 31, 20042004-07-31
Fred Marshall wrote:> "Peter Choi" <choi@mecca.ca> wrote in message > news:6RFOc.142047$Mr4.44404@pd7tw1no... > >>Hello, >> >>Anyone can point me to a source where I can learn how to read and capture >>video signals from one of those pinpole color camera into a C6711 DSK? > > Like > >>what type of A/D hardware I need and what the signal scheme is like? > > > Peter, > > I know what a "pinhole" still camera is. But, I don't generally think of > pinhole cameras and video together. I suppose it's because the "exposure" > time is long for a pinhole camera and won't support a video frame rate. > Unless you have a dynamite sensor!They're pretty common, actually. They aren't terribly good in low light, but the "lenses" are very cheap. :-) From http://www.advanced-intelligence.com/video.html: WORLD'S SMALLEST WIRELESS Color VIDEO CAMERA WITH AUDIO !! SIGNAL TRAVELS THROUGH WALLS. SOLD COMPLETE WITH 6" Color LCD digital monitor/TV with a built in Wireless Video/Audio Receiver!. MODEL VID 001 PRICE $ 1290 ... There are lots of hits at http://www.google.com/search?q=pinhole+video+camera Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●August 1, 20042004-08-01
"Jerry Avins" <jya@ieee.org> wrote in message news:410be54d$0$2825$61fed72c@news.rcn.com...> Fred Marshall wrote: > > > "Peter Choi" <choi@mecca.ca> wrote in message > > news:6RFOc.142047$Mr4.44404@pd7tw1no... > > > >>Hello, > >> > >>Anyone can point me to a source where I can learn how to read andcapture> >>video signals from one of those pinpole color camera into a C6711 DSK? > > > > Like > > > >>what type of A/D hardware I need and what the signal scheme is like? > > > > > > Peter, > > > > I know what a "pinhole" still camera is. But, I don't generally thinkof> > pinhole cameras and video together. I suppose it's because the"exposure"> > time is long for a pinhole camera and won't support a video frame rate. > > Unless you have a dynamite sensor! > > They're pretty common, actually. They aren't terribly good in low light, > but the "lenses" are very cheap. :-) From > http://www.advanced-intelligence.com/video.html: > WORLD'S SMALLEST WIRELESS Color VIDEO CAMERA WITH AUDIO !! > SIGNAL TRAVELS THROUGH WALLS. > SOLD COMPLETE WITH 6" Color LCD digital monitor/TV with a built in > Wireless Video/Audio Receiver!.Ah! OK These all seem to be NTSC or PAL - the security industry standards.... Seems to me the easiest thing would be to capture into a PC and go from there. If this is heading to a product then that might be a different matter. I don't know anything about the C6711 DSK except it has an interface to a PC via parallel cable. A big driver in how to do it might be the frame rate you expect to deal with. Fred
Reply by ●August 2, 20042004-08-02
Hello, My big question is how does one capture a NTSC signal I guess with a regular ADC. Is there a site online where I can learn about the NTSC video format? Do I have to do any down sampling before I can do the ADC? And then more down sampling and filtering to separate the color signals? Or all of these are done in the frame grabber you mentioned?
Reply by ●August 2, 20042004-08-02
On Mon, 02 Aug 2004 06:40:24 GMT, "Peter Choi" <choi@mecca.ca> wrote:>Hello, > >Is there a site online where I can learn about the NTSC video format?Recommendation ITU-R BT.470-6, Conventional Television Systems http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=R-REC-BT.470 (You can download this for free once you've registered.) Regards, Allan.
Reply by ●August 2, 20042004-08-02
> Anyone can point me to a source where I can learn how to read and capture > video signals from one of those pinpole color camera into a C6711 DSK?Like> what type of A/D hardware I need and what the signal scheme is like?You can also use a sensor with a digital output like the ST VV6500, often used in Webcams Wim
Reply by ●August 3, 20042004-08-03
"Peter Choi" <choi@mecca.ca> wrote in message news:sllPc.156120$od7.114086@pd7tw3no...> Hello, > > My big question is how does one capture a NTSC signal I guess with aregular> ADC. Is there a site online where I can learn about the NTSC videoformat?> Do I have to do any down sampling before I can do the ADC? And then more > down sampling and filtering to separate the color signals? Or all ofthese> are done in the frame grabber you mentioned?Yes to the latter. Look for an inexpensive frame grabber. Check on ebay. Fred
