Improving Feature Perception in Sonar Displays by Contrast Normalisation and Enhancement.
1997
Benke, K. K. | Hedger, D. F.
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.
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