Showing papers on "Channel (digital image) published in 1975"

Holographic color television record

Abstract: A method and apparatus for constructing and relaying an optical holographic record containing a plurality of very small holograms, each of which contains color information independent of the other holograms. Each piece of full color information, such as a frame of an ordinary color photographic movie, is recorded as an individual hologram. The record is a narrow, elongated flexible film with the holograms formed in a line along its length, each hologram touching those on either side thereof. One or more light sensitive detectors for converting an image into a time varying electronic signal are positioned to receive holographically reconstructed signals and transform them into a form acceptable to an ordinary color television set for displaying the color information thereon. One, two and three image detecting tube systems are disclosed. Several independent monochromatic components of a color information signal are carried on a single optical-electronic channel by modulation onto carrier frequencies either optically or electronically prior to construction of the hologram record. In a preferred embodiment described, the hologram record is constructed in a manner to reconstruct a broad bandwidth luminance signal in a position spatially separated from the color component signal.

Devices for the copying of images by sequential sweeping

Abstract: An optical assembly for a stencil making device employed for scanning an original document to provide a light image of indicia thereon to a photomultiplier tube which converts the light image into electrical signals includes a housing taking the form of a block having at least one aperture or channel therein for receiving a lamp A second channel extends at right angles from the first channel toward a predetermined wall of the block The last-mentioned channel opens at the wall so that light from the lamp passes outwardly of the second channel onto the original document positioned adjacent the wall A third channel extends into the block adjacent the second channel A lens in the last-mentioned channel focuses reflected light images of the indicia through the third channel to the end of an optical fiber which carries the image to the photomultiplier tube The dimension of the cross-sectional end of the optical fiber determines the scan area

Human factors considerations for the use of color in display systems

Abstract: Identified and assessed are those human factor considerations impacting an operator's ability to perform when information is displayed in color as contrasted to monochrome (black and white only). The findings provide valuable guidelines for the assessment of the advantages (and disadvantages) of using a color display system. The use of color provides an additional sensory channel (color perception) which is not available with black and white. The degree to which one can exploit the use of this channel is highly dependent on available display technology, mission information display requirements, and acceptable operational modes.