Re: [Coriander-user] Extending integration time coriander

[nano <nan...@gm...>]

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Damien, thanks for awesome software - really helped me on numerous projects
2007-2009.

i've since moved on from computer vision, but at the time coriander was the
primary tool for getting point grey cameras online & functional.

cheers




On Thu, Jul 18, 2013 at 3:42 PM, JD <jd...@gm...> wrote:

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> Thanx.
>
>  On 07/18/2013 08:28 AM, Damien Douxchamps wrote:
>
> Hello Katherine,
>
> On Thu, 2013-07-18 at 03:00 -0700, Katherine Yang wrote:
>
>  Hi coriander users,
>
>
> I was wondering if there was an easy way to extend the exposure time
> to much longer(more than 5 seconds)? I will be operating the camera in
> a very dark room. Please help!
>
>  Coriander cannot change the limitations of your camera. However, getting
> longer exposures can also be achieved by taking many shorter exposures.
> There's some limitations of course, but if your camera has a high bit
> depth (12 bits?) then it may be reasonable to take, say, 100~1000 images
> and then "add" the images together.
>
> This will fail if the room is so dark that the LSB does not change. Or
> that the LSB is completely lost in noise.
>
> But remember also that very long exposures on digital cameras lead to
> other forms of noise (typically similar to hot pixels). For that you may
> have to take a identical exposure with the lens cap on (no light) and
> subtract this 'dark frame reference' from your long exposure.
>
> Damien
>
>
>
>
>
>
>
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