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revans
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Reged: 09/26/05
Posts: 1637
Loc: Fitchburg, MA
Shape from Shading Terrain Model from Single Image new
      #723079 - 12/09/05 07:30 PM Attachment (44 downloads)

I have previously posted several terrain maps of lunar craters made in the CAD program Rhino 3.0 from single photographs. The heightfield map generation in Rhino uses a shape from shading model. A good discussion of this model as applied to the moon can be found in this pdf file (which is in English):

www.ipi.uni-hannover.de/html/ forschung/schautafeln/Lohse05.pdf

I thought it might be interesting to post a shape from shading derived digital terrain map made from a single photograph of terrestrial subject matter everyone would recognize, such as a group of buildings photographed from the air.

Below is a very old photograph of Ellis Island. Following it I will post several digital terrain maps made from this one photograph in Rhino 3.0. This should give us a good example of what can be expected of detail in lunar craters with this method.

Attachment


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revans
Carpal Tunnel


Reged: 09/26/05
Posts: 1637
Loc: Fitchburg, MA
Re: Shape from Shading Terrain Model from Single Image new [Re: revans]
      #723083 - 12/09/05 07:33 PM Attachment (42 downloads)

Now a digital terrain map (DTM) made in Rhino from the photo above. Rhino calculates heightfields from the standard image using a shape from shading algorithm.

Attachment


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revans
Carpal Tunnel


Reged: 09/26/05
Posts: 1637
Loc: Fitchburg, MA
Re: Shape from Shading Terrain Model from Single Image new [Re: revans]
      #723086 - 12/09/05 07:36 PM Attachment (42 downloads)

The model is three dimensional and contains z axis (height) information. It can be viewed from any perspective and can be cross sectioned and the cross sections viewed on edge for height measurements.

Here is another perspective view:

Attachment

--------------------
Rick Evans
http://www.freewebs.com/revans_01420/

The moon speaks Octave...



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revans
Carpal Tunnel


Reged: 09/26/05
Posts: 1637
Loc: Fitchburg, MA
Re: Shape from Shading Terrain Model from Single Image new [Re: revans]
      #723089 - 12/09/05 07:38 PM

In this last view, the height has been exaggerated by a factor of 3 to emphasize detail.

Rick

--------------------
Rick Evans
http://www.freewebs.com/revans_01420/

The moon speaks Octave...



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kraterkid
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Reged: 03/07/05
Posts: 4709
Loc: Jacumba, California
Re: Shape from Shading Terrain Model from Single Image [Re: revans]
      #723862 - 12/10/05 11:23 AM

Fascinating work Rick!

--------------------
Rich



My CN Gallery




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