3d Reconstruction from Stack

Posted by Andrew E. Meyer on Jun 23, 2011; 9:28pm
URL: http://imagej.273.s1.nabble.com/3d-Reconstruction-from-Stack-tp3684002.html

We have an application where we are taking a stack of pictures of a fuel
injector seat and spray orifices, and trying to reconstruct a 3-Dimensional
image for use in verifying that  the hardware was made to spec.  We are
using a microscope with a short focal length, so that the features in the
stack appear to grow in size as we get closer to the object.  (think of a
star field animation, where the nearer stars go racing to the edge of the
picture as the spaceship goes through the star field).

 

First, is there a name for this "star field" effect by which I could search
for information?

 

We have tried using stack focuser and EDF to create a three dimensional map
from our stack with very limited success-the images are very noisy and don't
correspond to the reality which we can measure, so we cannot trust them for
the stuff we cannot measure.  Maybe I'm just not using these extensions
properly?  I'm new to this, but it is my understanding that these techniques
determine position of each point based on how sharp the focus for the point
is, so moving features might be a problem for them.

 

From our stack, it would seem that the three dimensional information we are
looking for could be easily found by tracking the position of each feature
in the photograph from frame to frame-the nearer objects moving outward more
rapidly than the closer objects.  Does anyone know of a routine for this
kind of application?  If not, can someone recommend a place to start with
developing one.  Ideally the 3d image developed would take account of both
the changing position of the features and the changing focus of the
features.

 

I'm a mechanical engineer with a physic minor (Princeton University, '81)
and I'm willing to dig in and learn what I need to, especially if anyone can
give me some leads in where to start developing such an application.  I
could also use some guidance on understanding the physics of the optical
system.

 

Andrew E. Meyer

 President

 Beginnings Technology Inc.

 43 Palmer Drive

 Harpers Ferry, WV 25425

 USA

 

 Tel: [phone]

 Fax: [phone]

 

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