Digital filtering/enhancement/analysis of geologic long-range inclined asdic acoustic imagery

Kevin B. Shaw

doi:10.1117/12.19533

1 June 1990 Digital filtering/enhancement/analysis of geologic long-range inclined asdic acoustic imagery

Kevin B. Shaw

Proceedings Volume 1244, Image Processing Algorithms and Techniques; (1990) https://doi.org/10.1117/12.19533
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

Abstract

Various digital filters, edge detectors, histogram modification, and three-dimensional display experiments are performed on mosaicked Geologic LOng-Range Inclined Asdic (GLORIA) acoustic imagery. These experiments have the motivation of establishing Navy capability for viewing the seafloor-especially in deep water and in three dimensions, detecting objects on the seafloor, and enhancing existing monochrome GLORIA imagery. It was found that a Gaussian filter with a kernel size of 5x 5 provided subjective enhancement to the lower intensity areas while some of the other filtering techniques, e.g., difference and gradient destroyed the dynamic range of the image. Kernel sizes were found to be extremely crucial in the experiments with this imagery, especially the median filter which did provide excellent smoothing of the imagery without sacrificing the edges. The digital mosaicking performed on this particular data set of acoustic imagery was determined to introduce multiple artificial artifacts. Image analysis showed the intensities (8 bit, 0-255)to follow the classic Gaussian distribution. Histogram equalization yielded exceptional results for adding contrast (which allows the determination ofgeologicalboundaries and detection of various seafloor objects. The vector intensity profile of the intensity offered an interesting future research objective, the correlation of acoustic imagery to bathymetry, the measurement of the depth of large bodies of water.

Citation Download Citation

Kevin B. Shaw "Digital filtering/enhancement/analysis of geologic long-range inclined asdic acoustic imagery", Proc. SPIE 1244, Image Processing Algorithms and Techniques, (1 June 1990); https://doi.org/10.1117/12.19533

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KEYWORDS

Acoustics

Digital filtering

Image enhancement

Image filtering

Image processing

Sensors

Gaussian filters

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