Accession Number : AD0481155

Title :   INTERIM REPORT ON DIFFERENCING, 2 JULY 1965 - 1 FEBRUARY 1966,

Corporate Author : WESTINGHOUSE ELECTRIC CORP BALTIMORE MD

Personal Author(s) : Ley ,G. S. ; Wend ,G. ; McDevitt,H. I.

Report Date : APR 1966

Pagination or Media Count : 22

Abstract : Electrooptical instrusion detection techniques and their application to remote viewing surveillance systems are studied. The technique used involves storing an image of a scene, comparing with it a later image of the scene to find a difference between the two images. An intruder's arrival or motion in the scene will generate a difference signal. The interim report describes equipment developed to perform the differencing and preliminary results obtained with the equipment. The storage, comparison and generation of the difference signal are performed in the camera tube which is a Secondary Electron Conductivity Vidicon. The differencing operation consists of storing a positive charge image of the scene on a target electrode, then by changing appropriate biases storing a negative charge image of the later scene. The net charge is read out as the difference signal. Photographs of the video difference signal and of a monitor display of the difference signal are included. Measurements of detection sensitivity and susceptibility to false alarms are to be conducted in the course of the contract.

Descriptors :   (*TELEVISION DISPLAY SYSTEMS, *WARNING SYSTEMS), VIDICONS, ELECTROOPTICS, DETECTORS, TELEVISION CAMERAS, TELEVISION EQUIPMENT, OPTICAL IMAGES, SECONDARY EMISSION, COMBAT SURVEILLANCE, CAMERA TUBES, VOLTAGE, VIDEO SIGNALS, SEQUENTIAL PHOTOGRAPHY

Subject Categories : Optical Detection and Detectors
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE