Re: [tech-3d] holographic 3d

[lunazzi <lunazzi@xxxxxxxxxxxxxx>]

The technique of projecting with mirrors is as old as 4000 years (the Incas and
the Olmecas).
http://www.geocities.com/Athens/Forum/3853/olm1e.html

Projecting on lenses is also interesting, it renders a floating image.
The progress in this last years shoul be in increasing the field of view, wether
using paraboloidal mirrors more specific that the Olmecas ones (as Peter Homer
indicated) or Fresnel lenses, thinner and lighter than ordinary glass lenses.

In any case, I think that the progress is not too significative, we must measure
the images to have parameters to compare. Measuring in pixels or showing a
single view picture or even a stereo photograph is not sufficient. Maybe
"voxels" (volume units of images).

My proposal is to measure the size (volume)of the image in liters (lt, as for
liquids), while the field of view would be measured as an angle or, better, by
indicating distance of view and lateral field (displacement allowed to the
observer).  No parameters are given in most news on this kind of subject.

I always worked in demostrating and proposing diffractive elements, which I
consider that can increase considerable those parameters. Although color is not
possible to reproduce in simple systems. I obtained  one first patent iniciated
in 1989 approved in 1991, and another one initiated in 1993 was recently
approved. This last deals with the projection of an object on a diffractive
screen.

My technique is reaching the level of registering videos (it will come soon) and
there are videos of floating animated pictures on my site now, but I do not want
to divulgate it more until I succeed in focuisng better with my video camera. If
you, my co-listers, want to see a preview, go to:

http://www.geocities.com/CapeCanaveral/Lab/6146/protTV/holoman_i.htm

Any hint as how to get funding for this kind of research is welcome.

José
<lunazzi@xxxxxxxxxxxx> <http://digicron.com/lunazzi>


Peter Abrahams wrote:

> (posted to photo3d & tech3d)
> This is an edited version of the story at:
> http://www.wired.com/news/technology/0,1282,40264,00.html
>  3D Projection Without the Glasses    by Leander Kahney  Nov. 17, 2000
> at Comdex this year was a 3D display that projected volumetric images into
> thin air... Dimensional Media set up a booth full of 3D displays that
> projected images -- of objects such as cell phones or soda cans -- into
> space in front of the viewer....the images at Comdex were often as vivid
> and concrete as real objects.... does not require special glasses or any
> kind of headgear. .... Dimensional Media, which is based in New York,
> originally developed the technology for the military with funding from
> Defense Advanced Research Projects Agency (DARPA).... The simplest version
> of the technology is based on a system of mirrors and lenses. The object
> whose image is being projected sits inside a pedestal, which projects the
> object's light into space above the pedestal, where the image is reformed.
> The effect is as if the object itself is hovering above the pedestal's
> surface.  The company also demonstrated video versions of the technology,
> which projected video images in 3D. ....a 3D teller-machine whose buttons
> floated in space in front off the viewer. To activate the system's virtual
> "buttons," the viewer simply pointed a finger at the image of the button.
> The system uses a grid of infrared lights -- similar to systems in stores
> that beep when a shopper enters -- to calculate the position of the
> viewer's finger.  Dimensional Media said its images are already starting to
> turn up in advertising displays at shopping malls and airports around the
> world, and they should become quite common this year as more and more are
> installed.  "We are really starting to sell these systems," said CEO Daniel
> Pfeffer.  Dimensional Media said the company will start testing the first
> volumetric 3D computer monitor early next year, which it hopes to sell to
> medical providers, the military and CAD/CAM companies..... the monitor
> could project X-Ray or NMR data in 3D, creating a precise image of the
> inside of a patient's skull and the location of, say, a tumor. The display
> could then overlay another image onto the patient's actual skull, showing
> the surgeon the exact place to cut.
>
> _______________________________________
> Peter Abrahams   telscope@xxxxxxxxxx   The history of the telescope &
>    the binocular:   http://www.europa.com/~telscope/binotele.htm
>


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