Re: [CAD_CAM_EDM_DRO] Re: photgraphs and obtain 3d images.

Hi Andrew,

I seem to remember there was a chap at the local university doing something
like this with even simpler equipment. From what I remember he shone a
normal desk lamp on the original 3d object and pointed a video camera at it
as well - at an angle to it. Then he waved a pencil between the lamp and the
object and somehow captured the video image on a computer in such a way that
it processed the image as the shadow of the pencil revealed the contour of
each part of the surface as it passed across it, and reassembed this into a
usable 3D drawing form.

Best wishes,
Ian
--

Ian W. Wright
Sheffield, UK


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----- Original Message -----
From: "Andrew Werby" <drewid@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, September 18, 2002 11:00 AM
Subject: [CAD_CAM_EDM_DRO] Re: photgraphs and obtain 3d images.


> Message: 17
> Date: Wed, 18 Sep 2002 09:16:34 -0700
> From: "Harrison Scofield" <sisyphus@...>
> Subject: Re: photgraphs and obtain 3d images.
>
>
> Yasu-san,
>
> I am only a mathematician but I don't see how it would be possible to
> digitize a standard two-dimensional photograph to create a
> three-dimensional image. But, if someone know of such a product, I too
> would be very interested in it.
>
> [It is possible to do this, but the results are not going to be a very
> accurate representation of the 3d object the photo started with. These
> programs use "heightfield" algorithms to assign a height to each pixel in
> the photo based on its place on a dark/light scale. Then these height
points
> are used to generate a mesh. One program