[Elphel-support] INFORMATION CONCERNING NC353L-369-IMU-GPS

[Oleg]

Hi, Daniell,


> What recording format to choose so as to be able to write files without
> loosing  quality and maintaining reasonable file size?


I would go JP4 <http://wiki.elphel.com/index.php?title=JP4> format. It is
designed to preserve as much data as possible during compression.


>  Do you propose or know of  some software that will enable us to go from
> recording to viewing/editing? we want to keep this as simple as possible as
> we will be recording many hours up to 6 hours per day.
>

When recorded the files are packed into MOVs. After that MOVs can be split
and converted to JPEGs or played with patched mplayer.
1. In this post<http://blog.elphel.com/2009/11/interfacing-elphel-cameras-with-gstreamer-opencv-opengl-and-python-get-profit-of-dsp-or-gpu-based-optimisation-control-camera-settings-from-python-application-or-human-interface-device-hid/>
there's
information about playing a JP4 stream - with MOV files it should work the
same.
2. Another program <http://blog.elphel.com/2010/07/jp4-workflow/> is called
movie2dng - it splits MOVs and converts JP4s into DNGs.

Setting up your workflow might require some scripting.

What would be the best method for storage?
>

The image size will not go above 2MB. So, 6 hours and 7 fps result in
~300GB of data.
The best option is to connect an external SATA HDD (or SSD).
Another option would be a couple of Compact Flash cards.


> Can we control frame rate?
>
Yes


> We fly at approximetly  75 Km/h and the distance from the wires varies
> from 10 to 30 meters.

What lens do you recommend for this?
>

Depends on the FoV you need. Could you show any sample pictures?
In the Eyesis4Pi system we use VD lenses (listed
here<http://www3.elphel.com/accessories>)
- F=4.5mm, F/1.8, M12-mount. We can also make the front end thermally
compensated and calibrate it to compensate for the lens distortions - like
in NC353-PHG <http://www3.elphel.com/nc353-phg> model.

Best regards,
Oleg Dzhimiev
Electronics Engineer
phone: +1 801 783 5555 x124
Elphel, Inc.
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