AVR-Chat

Hi Hein.

I'm thinking that is two ways that you could take.

1 - You should pick an faster ADC and even that, you should use an 
integer to get less pixels so less faster should be your read from 
the camera signal.

2 - There are some equipaments that has an camera and an processor 
built-in that give to you a picture in jpeg via serial link. But 
this will be only picture.

Bruno - Brazil

--- In AVR-Chat@yahoogroups.com, "kernels_nz" <kernels@...> wrote:
>
> Hi guys, I have a curly one, any creative suggestions would be
> appreciated.
> 
> Im interested in digitzing a B/W video waveform from a standard 
CMOS
> security camera, im only really interested in one line of video but
> the conversion time of the average AVR A2D is around 13-50us but 
the
> whole video frame is around 50us. 
> 
> I know I can overclock the AVR A2D to around 1MHz, but that still
> would only give 4 conversions per video frame.
> 
> So, a few ways that I could see around the problem is:
> 
> 1. Faster external ADC -> Not ideal because it adds cost, componets
> and it's hard to get hold of Megasample ADCs. Also, having a fast
> external ADC is useless unless you can communicate with it at 
super speed.
> 
> 2. Slow down "time" somehow so that I buffer a frame of video
> "somehow" and convert it at my leasure using the inbuilt ADC. <- 
This
> method requires "magic" and im not sure what type ? maybe someone 
has
> come across some way of doing this ?
> 
> 3. Use some of the "line" cameras that allow me to clock the video
> data out pixel by pixel. <- I can do this, and we even have the
> cameras available @ work, but I would prefer to use a off-the-shelf
> cheap video camera.
> 
> Any other ideas?
> 
> Thanks !
> 
> Hein B
> Auckland, New Zealand.
>