Accession Number : ADA311823

Title :   Improving Feature Perception in Sonar Displays by Contrast Normalisation and Enhancement.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : Benke, K. K. ; Hedger, D. F.

PDF Url : ADA311823

Report Date : FEB 1996

Pagination or Media Count : 23

Abstract : In seabed surveillance, the nonlinearity of the sonar display, together with variations in brightness and contrast arising from variability in the stored sonar data, will have a direct effect on the visual discrimination of seabed features. The loss of information at the man-machine interface is due to environmental and instrumentation effects, and can be partially corrected for in real-time (i.e. at video frame rates) if the data is digitised and available for computer processing. Methods are described for normalising 2-D sonar data and for correcting for luminance compression in the electronic display. Experimental results for sidescan sonar indicate that statistical normalisation and display calibration by gamma-compensation provide a standardised presentation of data. The procedure improves both the visibility of seabed features and the reliability of visual search during routine surveillance.

Descriptors :   *IMAGE PROCESSING, *HUMAN FACTORS ENGINEERING, *SONAR IMAGES, SIGNAL PROCESSING, CONTRAST, OPTIMIZATION, REAL TIME, TARGET DISCRIMINATION, BRIGHTNESS, NONLINEAR SYSTEMS, VISIBILITY, COMPUTER VISION, VISUAL PERCEPTION, DATA DISPLAYS, DATA COMPRESSION, MAN MACHINE SYSTEMS, NORMALIZING(STATISTICS), AUSTRALIA, VIDEO SIGNALS, PIXELS, ACOUSTIC DATA, SONAR SIGNALS, OCEAN BOTTOM, DYNAMIC RANGE, LUMINANCE, OCEAN SURVEILLANCE, SIDE LOOKING SONAR, SCANNING SONAR.

Subject Categories : Cybernetics
      Acoustic Detection and Detectors
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE