Re: re: streaming images from the Tini

The "TINI Camera" is really a demonstration of the workload a 75 Mhz 
DS80C400 can handle, which is pretty impressive if you look at it. It is 
capturing camera input, providing a serial shell, and handing an HTTPs 
server simultaneous. However, as a network camera, it leaves something 
to be desired. The real question is where the compression takes place. 
MPEG and JPEG compression are absolutely painful when executed in 
software without an FPU, but there are now IC's that do that for you. 
There are some devices now that take either RGB or composite input and 
perform the compression for you. With a device like that, a 75 Mhz 
DS80C400 could focus on sending the data, and if the image is 
pre-compressed, then there is more than enough available bandwidth.

Nick


Nelson Lai wrote:

>Hi,
>
>I was looking through the NetCam article described here:
>
>http://lists.dalsemi.com/maillists/tini/2003-February/024344.html
>
>and was wondering if anyone had actually constructed the unit and tested it
>for the max FPS possible. I'm thinking about experimenting with a camera
>that does JPEG compression. This would decrease the size of each image and
>hopefully allow me to up the FPS for a more fluid look. I did a rough
>back-of-the-envelope calculation and found that transferring
>320x240x8bitx15fps MJPEG stream should take only around 56kilobytes/s. Is
>this within the range of possible transfer speed from the camera to the c400
>and then out over a network?
>
>Thanks,
>Nelson Lai
>
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