[Elphel-support] UDP Image server

[Andrey Filippov]

Hi Leonardo,

> Hi guys I would like to know how could I create an UDP server in Elphel
> 353, in order to deliver images with 640x480 grayscale resolution. With fps
> around 120.  (Is it even possible?)
>
Yes, it is possible provided you have enough light so the exposure time will
be less than 1/120 sec (it is so in most cases) . You can setup the internal
camera streamer to run in multicast mode, it then will use UDP.

> I also know that there is some raw image server but I don’t know how could
> I use it…. And it’s throuhput (Images per second)
>

You mean acquiring "raw" (uncompressed)  image data? It is possible, but
will be very slow (far less than 120 fps) - that mode is only designed for
test purposes, software debugging. If you need  high quality images you may
just use gamma=0.5 (matches sensor shot noise) and high JPEG quality
settings. Even if the camera had high speed raw mode 640x480*120fps
~=37Mpix/sec. Even if you packed then so 3 pixels use 3 bytes (sensor output
is 12 bit and the camera uses all the dynamic range when sending data in
JPEG/JP4 mode), you will need some 55 MiB/sec bandwidth. The 100baseT that
camera has is 5 times slower

> Those images will be processed by some external computer….
>
Yes, understood. For monochrome images the grayscale JPEG is fine, for color
ones you may use JP4 to bypass color interpolation in the camera.

Andrey
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