Abstract
This chapter presents a summary of the image-processing techniques being used at present in the Institute of Oceanographic Sciences Deacon Laboratory’s GLORIA long-range sidescan sonar system. It begins with a brief review of the development of GLORIA, and then describes in outline the present shipboard data acquisition, recording and replay system, including simple image-processing techniques that can be used on-board ship. Next, a detailed form of the sonar equation is developed, and this is evaluated factor-by-factor, to demonstrate the effects of beam directivity, refraction and water depth on the form of intensity variation to be expected in the final image. Finally, we discuss recent developments in shore-based image-processing. These include the development of improved radiometric corrections to normalize range-dependent intensity variations, recovery of true backscattering levels and estimation of backscatter-ing coefficients, and combination of GLORIA with other data sets into single, colour digital images. As an example of the last process we show a digital mosaic of sonar data from the Southwest Indian Ridge, coloured as a function of depth derived from Sea Beam data in the same area.
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© 1990 Kluwer Academic Publishers
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Searle, R.C., Le Bas, T.P., Mitchell, N.C., Somers, M.L., Parson, L.M., Patriat, P. (1990). GLORIA Image Processing: The State of the Art. In: Hailwood, E.A., Kidd, R.B. (eds) Marine Geological Surveying and Sampling. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0615-0_3
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DOI: https://doi.org/10.1007/978-94-009-0615-0_3
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