I am interested does anyone tried to measure tree rings from sub-fossil oak cross-sections using an image analysis technique? When working with tree-ring measuring table, I usually do the measurements when the wood is still wet. I prepare a band on surface with a razor blade and treat it with chalk. However, the taking scans is problematic because the samples usually are quite big/heavy and the preparation of entire smooth surface is too difficult. What are your thoughts or experience with such samples?
Before we had Lintab, we scanned archaeological and subfossil sample. We didn't have to save the samples, so we split the sample along the radius and prepare the edge at a cross section with a razor blade at a slight angle. It turns out a fairly flat surface, which is more or less convenient to put on the scanner. The scanner resolution is usually enough to get a good image even if the surface is not always adjacent to the scanner glass.
Another option is to put a ruler near to the prepared surface and take a pictures series with a camera and use them. We did this for some of the structures in churches where it was not possible to take samples, but the camera resolution must be very good.
We have been preparing and scanning decayed yew wood using a water seal between the sample and scanner. The dendrochronological potential of decayed yew wood gives the method. It could possibly be helpful to you.
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