Re: Betterlight Camera Calibration
Re: Betterlight Camera Calibration
- Subject: Re: Betterlight Camera Calibration
- From: "Ken Fleisher" <email@hidden>
- Date: Mon, 6 Oct 2008 01:02:58 -0400
On Thu, Oct 2, 2008 at 6:34 PM, Stanley Smith <email@hidden> wrote:
> If they
> truly are adding the spectral readings from the painting surface into
> the mix of patches used to calculate the "scene referred" camera
> profile, then they would have to know precisely where these
> measurements were taken (down to the pixel), in order to compare the
> spectral measurements to the corresponding area of the captured image.
> There does not seem to be a way to do this, given the workflow diagrams
> provided.
Hi Robin, Stanley, and list,
First of all, sorry for being abscent from the thread I started (I've been
sick). Thanks for describing your product. I think this sounds like a
definte step in the right direction. To answer Stanley's question, you don't
need the measured camera response because, I assume, it is being estimated.
This is why you need 1) the spectrum of the illuminant, 2) the spectral
response curve of the sensors (Betterlight knows their own sensors, so this
is why it is not a generic solution), and 3) the spectra of the samples from
the artwork. The camera response (the RGB values) will be an integration of
these three things. There is likely other optimization happening, but this
explains why you don't need to know the exact areas on the painting where
the measurements were taken from.
Ken Fleisher
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