Re: Stereo topography

Posted by Gabriel Landini on Oct 12, 2009; 9:49pm
URL: http://imagej.273.s1.nabble.com/Stereo-topography-tp3690806p3690807.html

On Monday 12 October 2009 21:53:27 Anovitz, Lawrence {Larry} M. wrote:
> I am looking at SEM images of sandstones, and would like
> to quantify the fractal dimensionality of this surface at this scale.
> One way I have thought to do this is to take two or more images,
> Tilted relative to one another, to create a stereo pair. From there,
> And given the scale of the image, there should be a way to reconstruct
> The surface topography as topographic slices or even a digital elevation
>  map. This could then be used to calculate the "3-D" fractal dimension.

An easy way to achieve that once you determined the elevation map, is to
'flood' it at various levels and determine the dimension D of the 3d
coastlines of the islands or lakes. The dimension in 3d is D+1.
You can do the 2d analysis with the built in box counting method.

However stereo pairs do not give you the whole 3d structure (some caves and
overhangs might not be possible to image).

Cheers

G.