Re: Video capture/compression


The AT91SAM9260 and the AP7000 has a digital camera interface
but if you have signifiant volume,then one of the digital camera chips
might
work.

Ulf I expected better from you, he specifically says 'existing' analog
cameras.
So this is to go into situations to connect to existing cameras. This is
not
replacing cameras situations but obviously a device to hang onto existing
installations/units being sold.


Think You misunderstand...
I assume that there is a way to get CCIR analogue data to a digital stream
compatible with the output of a CMOS imager.
This is basically data, hsync, vsync and pixel clock.
If that is possible, then you can connect that datastream to a processor
which can DMA to SDRAM.

How is replacing existing cameras with digital cameras going to help?

That was not the plan...


The AT76C115 can do VGA 30 fps compression.

Which if he has CCIR analog cameras (normal resolution 768x576 @ 50Hz
interlaced) is going to be of little use. CCIR was mentioned in his first
post.


The AT76C11x chips have a PAL output, so they are used to this type of
resolution.

I was really talking about compression performance.
You probably need to deinterlace in S/W, not sure the CPU can handle that,
but after that, it should be straightforward.

VGA at 30 fps = 9,216,000 pixels per second
CCIR at 25 fps (50 fps interlaced) is 11,059,200

11,059,200/9,216,000 = 1,2 so we are talking about the same order of
magnitude.
The VGA colour solution is probably using more bits per pixel.

Need to talk to your local Atmel representative to get NDA signed/info.

These look like standard 'multimedia' phone chips, not video chips.


No, they are optimized for digital cameras.

Questions for Meindert

1/ Is this CCIR mono or RGB?
2/ What compression rate and delay are you looking for?
3/ Is the output to storage or a transmission link?
4/ What sort of compression are you looking for?

You might need to look at people like LogicDevices www.logicdevices.com
or more likely Averlogic www.averlogic.com.

--

AVERLogics solutíon seems equivalent to the one provided with the 115.
You have a video decoder chip, providing the digital interface which
connects to a video compression IC; which is controlled by a
32 bit RISC processor.

The AT76C115 integrates both the compression engine and the RISC processor.


--
Best Regards,
Ulf Samuelsson
This is intended to be my personal opinion which may,
or may not be shared by my employer Atmel Nordic AB


.

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