DISPLAY FACTORS AFFECTING THE VISIBILITY OF INFORMATION ON A SIMULATED PASSIVE SONAR DISPLAY

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Authors
  1. McFadden, M.
  2. Zulauf, M.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
With current sonar technology the operator must handle large quantities of data. The primary medium for displaying this data is the CRT. Because of the limited space available on the CRT, the operator must scan multiple pages of data rapidly if he or she is to monitor all of the information. Thus, signal visiblity is crtical. To ensure good visibility, it is necessary to understand the impact of display characteristics on the detectability of signals on a display. The study examined two factors that could influence the detection of lines on a frequency-time-intensity (FTI) display. The first was type of monitor - multichrome or monochrome. Current systems use a monochrome monitor because its resolution is believed to be superior to a multichrome monitor. The second was orientation of the signals relative to the orientation of the CRT raster. Currently, the signals on an FTI display are perpendicular to the CRT raster. The study examined the advantage of having signal lines on the FTI display fall along the scan lines of the CRT. In addition, performance was assessed in two conditions in which the visual image was potentially degraded. The degraded displays resulted from the reduction in average luminance of the monitor that frequently happens over time and the use of long video cables between the computer monitor and processor. In all the conditions, subjects had to detect signals of varying strength presented on a simulated FTI display.
Keywords
Signal lines;Monochrome monitors;Multichrome monitors;Frequency-time-intensity display
Report Number
DCIEM-95-46 — Technical Report
Date of publication
01 Nov 1995
Number of Pages
35
DSTKIM No
96-01384
CANDIS No
155543
Format(s):
Document Image stored on Optical Disk;Hardcopy

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