Accession Number : AD0919898

Title :   Vehicle Detection on Television: A Laboratory Experiment.

Descriptive Note : Technical publication,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s) : Craig, George L.

Report Date : APR 1974

Pagination or Media Count : 30

Abstract : An experiment was conducted to measure the ability of observers to search for and detect vehicular targets in a real-world scene displayed on a TV monitor. Search time was limited to 3 seconds; the variables investigated were (1) angular subtense of the display and target, (2) the number of TV scan lines making up the target, and (3) the target-background contrast. The angular subtense of the display and target significantly affected performance; it was found that the display should subtend at least 8 and preferably 10 degrees to the obsever. Larger displays yielded little improvement in performance. The number of TV scan lines making up the target did not significantly affect performance; the lowest number used in the tests(seven) was sufficient, and increasing the number did not improve performance. Target location in the scene significantly affected performance; targets located in the bottom of the scene were easier to detect. Because of the oblique view, the targets in the bottom were larger and there was less terrain/foliage clutter. (Author)

Descriptors :   *TELEVISION DISPLAY SYSTEMS), (*TARGET DETECTION, (*OPTICAL DETECTION, TELEVISION DISPLAY SYSTEMS), VEHICLES, OPTICAL IMAGES, LINE SCANNING, SIZES(DIMENSIONS), VISUAL PERCEPTION, CONTRAST, PERFORMANCE(HUMAN), PERSONNEL.

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE