Browse Prior Art Database

3 D Display for Real Subjects

IP.com Disclosure Number: IPCOM000075050D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 17K

Publishing Venue

IBM

Related People

Hirsch, PM: AUTHOR [+4]

Abstract

A 3-D display of a real subject can be obtained by a technique of scanning the subject from different angles, processing the scan data in accordance with kinoform techniques and displaying the result.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 83% of the total text.

Page 1 of 2

3 D Display for Real Subjects

A 3-D display of a real subject can be obtained by a technique of scanning the subject from different angles, processing the scan data in accordance with kinoform techniques and displaying the result.

A 3-D view of a real subject can, thus, be obtained by the following steps:
1) Acquire a N x N point representation of the subject using a

video digitization scheme, where the vidicon covers a first

aperture.
2) Rotate the vidicon relative to the subject so that it covers

a new aperture whose right edge is at the left edge of the

first aperture. Record another N x N array.
3) Repeat step 2, as required, to build up a viewing window large

enough to exhibit the perceptual 3-dimensional qualities of

the subject.
4) Compute digitally the wavefront scattered from the subject

in the window by computing

(Image Omitted)

The variables k, m, are dependent on the viewing window

and will change for each

N x N aperture. Additional details of this point aperture

wavefront calculation is given in the Communications

of the ACM, Vol. 11, No. 10, Oct., 1968, pp. 661-674.
5) Make a kinoform by plotting the phase of the wavefront W on a

grey level plotter and then producing a relief image

proportional

to the amount of darkening on the film, that is if

W(k,m) = A(k,m) exp>i phi(k,m)|

then plot

phi(k,m) modulo 2 pi scaled from 0 to the highest grey level

of the plotter

or the kinoform can be made using a computer controlled phase

plotter such as the Deform...