Optics: motion pictures – Stereoscopic cameras and/or projectors
Patent
1992-03-13
1994-11-01
Gellner, Michael L.
Optics: motion pictures
Stereoscopic cameras and/or projectors
352 60, 352133, G03B 3500, G03B 3508
Patent
active
053611063
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a high definition system for the cinema.
In a first aspect the invention provides a method and a camera for recording image frames on an image-recording medium, successive frames being displayed, in use, at a predetermined frame rate defining a predetermined frame period, the camera being characterized in that it is provided with filter means having a plurality of filter planes each capable of transmitting light in a different wavelength band, the filter planes of the filter means being interposed sequentially between an object, the image of which is to be recorded, and the image-recording medium so that the complete sequence of filter planes is repeated once in each frame period.
In a further aspect the invention provides a cinematographic film having a plurality of image frames formed thereon, the film being displayed, in use, so that successive image frames are displayed at a predetermined frame rate defining a predetermined frame period; each image frame comprising a plurality of image components superimposed on one another, the plurality of image components having been formed by successive exposures to light in different wavelength bands during a single frame period.
In a further aspect the invention provides a method and means for displaying image frames recorded by the method outlined above, the means being characterized in that a light signal derived from the recorded image frames is subjected to a filtering operation in which the said signal is passed through filter means having filter elements each capable of transmitting a light signal representing a different wavelength band, the light signal being passed through the filter elements sequentially so that the complete sequence of filter elements is repeated once in each frame period.
Thus the system of the invention can effectively double the exposure rate of standard cine-photography, from 24 Hz to 48 Hz, without doubling the speed of the original recording camera or doubling the speed of the final on-screen projector.
Basically, the system is a colour subtraction (filtering), colour inversion and colour recomposition system, involving the precise, synchronised interposition of filters.
The system will be described in detail below, by way of example, in its recording (encoding) and projection (decoding) modes with reference to the drawings, in which:
FIG. 1 shows schematically the image of a fast moving object formed on a cine film:
FIG. 2 shows a two-colour filter positioned in front of a cine camera lens;
FIG. 2a illustrates schematically the transmission spectra of the colour planes of the filter of FIG. 2;
FIG. 3 is analogous to FIG. 1 and shows schematically the images formed when the filter of FIG. 2 is positioned between the object and the camera;
FIG. 4 illustrates the use of two cine cameras each provided with a colour filter as shown in FIG. 2;
FIG. 5 shows the arrangement of FIG. 4 in greater detail;
FIGS. 6A to D show an arrangement for projecting film negatives obtained using the camera arrangement of FIGS. 4 and 5;
FIG. 7 shows diagrammatically the projection scheme of the arrangement of FIGS. 6A to D;
FIG. 8 shows an alternative projection arrangement using a single projector assembly;
FIG. 9 shows a rotary filter for use in the apparatus of FIG. 8;
FIG. 10 shows schematically the arrangement of exposures on a 70 mm film strip;
FIG. 11 shows the arrangement of FIG. 10 in greater detail;
FIG. 12 shows a combined shutter and colour filters for use in the apparatus of FIG. 8;
FIG. 13 shows the shutter/colour filter of FIG. 12 in use; and
FIG. 14 shows projection of the dual images on the film strip of FIG. 10 onto a single screen.
A conventional cine (recording) camera 8, working at a frame rate per sec (f.p.s.) of 24 Hz, will as shown in FIG. 1, `catch` a fast moving object 9, twenty four times a second on consecutive frames 10, as a series of elongated blurs 12.
A two plane colour rotating filter 20 is introduced in front of the cine camera 8 as shown in Figure (with each colour plane 22,24 of the f
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Delta System Designs Limited
Gellner Michael L.
Lee Eddie C.
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