Reply by August 13, 20072007-08-13
Miem wrote:
> I wonder if someone tell me how to digitize and save/record composite > color video data (and optionally audio) from a low-cost camera into > compact flash or SD memory without using a PC.
That depends entirely on where you drawn the line beyond which you call things a "PC". Generally, a system capable of pulling off that job will most likely end up more expensive than your average PC.
> But, I want to learn how to digitize and record composite video (as a > hobby) with an AVR (and/or a PIC) or some other simple > microcontroller.
Let me put it bluntly: no way is that going to work as advertized. The most an AVR or PIC could do for you in such a system is house-keeping and control for several specialized chips that do the actual work. Those controllers are nowhere near fast enough for realtime video processing on their own.
Reply by Donald August 12, 20072007-08-12
linnix wrote:
> On Aug 12, 5:27 pm, Miem <MiemC...@gmail.com> wrote: > >>Hi, >> >>I wonder if someone tell me how to digitize and save/record composite >>color video data (and optionally audio) from a low-cost camera into >>compact flash or SD memory without using a PC. >> >>... >>But, I want to learn how to digitize and record composite video (as a >>hobby) with an AVR (and/or a PIC) or some other simple >>microcontroller. > > > Didn't I answere this question somewhere, sometime? You cannot do > video capture with PIC/AVR alone. You can do the easy way with a chip > like SAA71XX or the hard way with FPGA, flash A2D and local RAM. Of > course, you can do the whole thing in a single chip ASIC. > >
I think the OP needs to understand what it will take to digitize video. Once he understands that, he will be ready to understand your (linnix) response. Good Luck to Miem, I hope he will take the time to learn something new. donald
Reply by linnix August 12, 20072007-08-12
On Aug 12, 5:27 pm, Miem <MiemC...@gmail.com> wrote:
> Hi, > > I wonder if someone tell me how to digitize and save/record composite > color video data (and optionally audio) from a low-cost camera into > compact flash or SD memory without using a PC. > > ... > But, I want to learn how to digitize and record composite video (as a > hobby) with an AVR (and/or a PIC) or some other simple > microcontroller.
Didn't I answere this question somewhere, sometime? You cannot do video capture with PIC/AVR alone. You can do the easy way with a chip like SAA71XX or the hard way with FPGA, flash A2D and local RAM. Of course, you can do the whole thing in a single chip ASIC.
Reply by Miem August 12, 20072007-08-12
Hi,

I wonder if someone tell me how to digitize and save/record composite
color video data (and optionally audio) from a low-cost camera into
compact flash or SD memory without using a PC.

Following URL (http://www.circuitcellar.com/avr2006/winners/
AT3267.htm ) points an interesting AVR based image/video capture
circuit in which designer use an OV528 (www.ovt.com) which is a JPEG
compression chip designed for mobile phones and PDA's. My
understanding is that it requires OVT's digital camera chips.

However I want to be able to digitize/capture composite video signal
from any ordinary video source such as low-cost cameras, VCR, etc.

Do you know also any other circuit which can digitize composite video
signals without needing a PC?

I know I can purchase COTS units like
http://nservices.com/wireless3.htm
http://www.brickhousesecurity.com/memory-card-dvr-video-recorders.html
http://www.startechoutlet.com/product_404_detailed.htm
http://www.pimall.com/nais/ultraminidvr.html
http://www.eyespyli.com/dvr9800.htm

But, I want to learn how to digitize and record composite video (as a
hobby) with an AVR (and/or a PIC) or some other simple
microcontroller.

Thx

Miem