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Aw: Re: Acquiring Dental RVG on Linux

> The latter is coming closer to the reality, but not sure it's accurate
> enough as yet. May be there was a gap between the finger and the sensor
> when trial x ray was taken as our attention was on usb interface rather
> than lengths (getting computed length smaller than the actual one of the
> portion of the finger). I need to go and gather more x rays carefully (may
> be using a coin to make the boundaries more accurate) before confirming
> which measure is accurate or whether something else is required or is just
> a fixed calibration factor is needed.

There's actually pre-made x-ray markers for that


but I assume any known length might do for calibration.

OTOH, dental x-ray shows rather small structures so
the distance between the actual sensor surface and
the imaged body part could matter quite a bit.


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