Klemen wrote:
> Okay, not really talking about dedicated 3D input devices. What I
> mean to ask is, has anyone thought of or perhaps even done modelling
> with multiple-view camera setups?
>
> What I have in mind is building a clay or plastic model then
> photographing it using a digital camera. This setup would include the
> following:
> 1. the real-world model containing marked control points for surface
> extrapolation
> 2. a camera, moving around the model in an arbitrary fashion, taking
> pictures along the way (not necessarily in a pre-defined path)
> 3. a marker - a small model, such as a transparent cube, which would
> model the origin and axes. This marker would serve as reference for
> the scale and orientation for every photograph
>
> Now, what I'd like the tools, with which to accomplish this task, to
> do is to calculate the marked points on the model. This process would
> not be fully automated, rather each image would first be reviewed by
> the user and the user him/herself would mark the appropriate points
> on the photograph of the model to define the 2D points which
> correspond to specific 3D points on the model. Also, the user would
> need to mark the "origin cube" to define reference points. After this
> stage of point-and-mark is done, the program calculates the 3D points
> for each of the photographs and uses statistical analysis to
> determine the most likely position of a point on the model.
>
> I'm not looking for depth-of-field algorithms to produce dense 3D
> models; just the points, so I can model, say, NURBS surfaces using
> those reference points. I've looked at some sites offering some image
> rectification and affine transformation with projection, but they're
> all built for dense 3D reconstruction.
>
> Here's one example:
>
http://www-sop.inria.fr/robotvis/personnel/qdelam/ArticleFG98html/Article.forhtml.html
>
> It concerns moving a modelled hand to fit the depth-of-field produced
> by the program.
>
> Any information regarding these kinds of calculation? I guess I'm not
> alone on this subject, who hasn't thought of simplifying modelling
> to, actually, child's play? ;)

http://mi.eng.cam.ac.uk/research/vision/photobuilder/aim.html

Might be useful.

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