Showing papers on "Real image published in 1968"

Optical tunnel high-speed camera system

Abstract: A high-speed framing camera is disclosed. The camera includes an optical tunnel of rectangular cross section for forming an extended array of virtual images of an event to be recorded. An objective lens system of limited aperture projects a cone of image-forming rays onto a face of a rotating mirror upon which face a real image of the event is formed. These rays are recollected by another lens to form an additional real image at the entrance of the tunnel. A copy lens at the exit of the tunnel forms rows of real images of these virtual images on an image surface outside of the tunnel. As the face of the mirror rotates through its recording angle, the images are sequentially illuminated.

Scanned holography systems using temporal modulation

Abstract: A hologram from which a three-dimensional image of a threedimensional object may be reconstructed is provided by combining the light scattered by the object with light from a reference light beam and cyclically offsetting in time (displacing in phase) the relationship between the reference and object beams thereby to form an image information beam which generates an interference pattern containing light information which includes conjugate images of the subject as well as undesired light information. The image information beam is temporally scanned in a plane essentially perpendicular to its axis (as by an image dissector) to generate a complex electrical wave form having frequencies containing information relative to the conjugate images of the object as well as the undesired light information. Only the frequencies having the conjugate image light information are passed to produce a holographic image as on at least one display tube (e.g.; cathode ray tube). A hologram recording from which an image or images of an object can be reconstructed, may be formed as by taking a photographic transparency of the holographic image on the display tube.

Holographic optical method and system for photoprinting three-dimensional patterns on three-dimensional objects

Abstract: Optical apparatus is disclosed for simultaneously illuminating every accessible (i.e., exposed-to-view) surface of a threedimensional object with monochromatic spatially coherent light. The light reflected from the object is collected and directed on a photosensitive film which also receives a reference beam of monochromatic spatially coherent light of the same frequency as the illuminating beam. The photographic hologram resulting from the development of the film is illuminated by a beam which is the conjugate of said reference beam to produce a real image of the original object. A suitably photosensitized duplicate object, placed at the position of the original object is exposed to the real image whereby every corresponding accessible surface of the duplicate object simultaneously is exposed to the real image.

Laser Light Diffraction, Spatial Filtering, and Reconstruction of Medical Radiographic Images: A Pilot Study

Abstract: Using a laser light source, an optical bench, transform lenses, and spatial filters in a system called LaserScan, 1 we are studying laser light diffraction, spatial filtering, and reconstruction of medical radiographic images, with the help of GTS Corporation, whose laboratories house the laser computer Medical radiographs are minified to a 35 mm second-generation transparency, then transilluminated by monochromatic, coherent, collimated light from a helium-neon gas laser A first transform lens produces a Fourier Transform of the minified image in the form of a diffraction pattern that is photographed on Polaroid film, and/or viewed with a CCTV system Spatial filtering is accomplished in the plane of the diffraction pattern by using various opaque elements of appropriate geometric form to filter undesired spatial frequencies Spatial filters take the form of ``wires,'' ``sector-wedges,'' and circular apertures, as well as other empirically determined shapes A second lens performs an inverse Fourier transform on the diffraction pattern producing a reconstructed, filtered, real image of the minified film This reconstructed image is also photographed on Polaroid film or viewed on the CCTV screen One of our goals is to remove certain unnecessary pattern detail from particular radiographic images so that characteristic patterns of diagnostic picture detail might be more readily identified and diagnosed Experimental results, including photographs of diffraction patterns and some filtered reconstructed images, are presented

Optical viewing system for aircraft window

Abstract: A PERISCOPIC TYPE OF OPTICAL VIEWING WINDOW ARRANGEMENT FOR A SST AIRCRAFT IS SHOWN WHEREIN ALL PASSENGERS SEE A VIRTUAL IMAGE OF A REAL IMAGE THAT IS PRESENTED ON A PROJECTION SCREEN. THE ARRANGEMENT UTILIZES AN OBJECTIVE LENS ASSOCIATED WITH A MINIATURE EXTERNAL WINDOW AND UTILIZES A FRESNEL MAGNIFYING LENS FOR PRESENTING THE MAGNIFIED VIRTUAL IMAGE.