[Elphel-support] About auto white balance

[Alexandre Poltorak]

Hi Melady,

Did you made any progress with your CCD front end interfacing to our cameras
?

I am organizing a workshop at RMLL 2010 in France
http://blogs.elphel.com/2010/06/elphel-workshop-in-bordeaux-during-rmll-2010/,
would be nice to meet you at the workshop.

Also it would be really useful to others if you can describe your project on
our wiki. It would also allows us to more easily help you to solve bugs.

Best regards,
Alexandre Poltorak


On Wed, Jun 2, 2010 at 7:42 AM, Andrey Filippov <andrey at elphel.com> wrote:

> Hi Andrey
>>>     We made a CCD(Sony ICX274AL) interface board to replace the CMOS
>>> board(10338 board),CCD board used an FPGA to simulate CMOS control
>>> interface,can be controlled by 353 board.
>>>
>>
> Hi Melady,
>
> Interesting project! We are often asked about availability of the CCD front
> end for the Elphel model 353 camera.
>
>
>>      Development process have encountered some problems related to
>>> automatic white balance,partial green image when the camera Backlight.
>>>     Can you give us some of the auto white balance work flow chart or
>>> algorithm document？
>>>
>>
> White balance algorithm that we use relies on some white objects in the
> selected area. And "white object" assumes that the brightest part of the
> image is white and it is true in most (not all) of the cases. Such algorithm
> can not work when some areas are over exposed (as on your example), I would
> recommend adjust parameters of the autoexposure so it will not try to
> balance colors if there is a lot of overexposure.
>
> Andrey
>
>
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