Patent
1985-05-06
1987-05-26
Mathews, A. A.
354101, G03B 3500
Patent
active
046680632
DESCRIPTION:
BRIEF SUMMARY
This invention relates to recording methods and apparatus for producing records of object fields, and also to production methods and apparatus for producing autostereoscopic images from intermediate records.
The use of a lenticular screen in conjunction with film emulsion positioned at the focal plane of the lens elements (lenticules) of such a screen, in order to compose and subsequently view a three dimensional image, is well known. In some methods separate two dimensional views of different perspectives of an object field are taken and then subsequently recombined through a lenticular screen to form the composite, so called, autostereoscopic image.
The fundamental property of an autostereoscopic image is that each eye views a different perspective of the object field by viewing the picture at a slightly different angle, and that the observer does not require special viewing devices to do so.
In broad terms there are two types of lenticular picture.
A first type of picture is formed on cylindrically lenticulated material having a large number of long narrow cylindrical lens elements or lenticules which are parallel-arranged. Each lens element is primarily convergent in planes both orthogonal to a plane containing the elements and orthogonal to the axis of the element. The element is less convergent in all other planes and in particular has no or substantially no convergence in planes containing the axis of the element. A portion of a specific perspective is recorded as a narrow stripe viewed from a specific series of vantage points as filling the lenticule. This type of lenticular picture only accommodates changes of perspective in one direction, allowing the viewer to change position in, for instance, the vertical direction without changes in perspective being observed.
The second type of lenticular picture is formed on lenticulated material having a two dimensional array of lens elements or lenticules, each of which is convergent in all planes orthogonal to a plane containing the elements. The elements may be formed as small spheroidal regions of the surface of the lenticulated material or by placing two cylindrically lenticulated surfaces in close proximity with the axes of one set of cylinders orthogonal to that of the second set. Each lenticule or lenslet operates symmetrically in two dimensions allowing changes of perspective in both the horizontal and vertical to be accomodated. Within the limits of the resolution of the emulsion at the focal plane of each lenticule and the latter's optical aberrations, each point of the emulsion behind a specific lenticule is seen to fill this lenticule when viewed from a particular vantage point.
For more detail on various proposals which might be employed to produce lenticular autostereoscopic pictures, descriptions may be found amongst the patent literature. U.K. Pat. No. 1,528,362 (Dimensional Development Corporation) describes a process of taking a number of different two dimensional perspectives of an object field and subsequently combining these into one lenticular picture, in which the emulsion behind each cylindrical lenticule is filled unambiguously with the appropriate image content.
U.S. Pat. No. 2,562,077 (Winnek) proposes the use of large diameter lenses in conjunction with a wide rectangular aperture in which a range of perspectives may be photographed in a single operation. Again cylindrical lenticules are shown and the space behind each lenticule is filled unambiguously by properly setting the width of the aperture in relation to the width of lenticules, the thickness of the lenticular material and the distance of the aperture from the film.
The use of spherically lenticulated film for recording autostereoscopic pictures with perspective changes in both horizontal and vertical directions is described in U.S. Pat. No. 3,683,773 (Dudley). Close packed hexagonal or square lenslets could be used in conjunction with an aperture of similar shape, the dimensions of such aperture being so chosen that the image of this formed by each lenticule on the film
REFERENCES:
patent: 2562077 (1951-07-01), Winnek
patent: 2833176 (1958-05-01), Ossoinak
patent: 3409351 (1968-11-01), Winnek
patent: 3608993 (1971-09-01), DeBitetto
patent: 3683773 (1972-08-01), Dudley
patent: 3759155 (1973-09-01), Bestenreiner et al.
patent: 4130337 (1978-12-01), Okoshi
patent: 4552442 (1985-11-01), Street
LandOfFree
Stereoscopic recording method and apparatus, and production meth does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stereoscopic recording method and apparatus, and production meth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stereoscopic recording method and apparatus, and production meth will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-699872