Posted by
LMAnovitz on
Oct 12, 2009; 9:56pm
URL: http://imagej.273.s1.nabble.com/Stereo-topography-tp3690806p3690808.html
Gabriel
thanks. A few questions
1. most importantly, do you have any idea how do I get the elevation map ?
2. what's the best way to try the flooding ?
3. are you sure the 3d dimension is D(2)+1 ? Could it be (3/2)D(2), or even not necessarily directly related ?
4. I agree wrt the limitations of the stereo pairs. I may be able to improve this by making and combining several stereo pairs at different tilts.
--Larry
On 10/12/09 5:49 PM, "Gabriel Landini" <
[hidden email]> wrote:
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.