Registration and variability of side scan sonar imagery
Nicholson, John W.
MetadataShow full item record
LocationWoods Hole, MA
This thesis presents the results of several experiments performed on side scan sonar equipment and imagery with the aim of characterizing the acoustic variability of side scan sonar imagery and applying this information to image rectification and registration. A static test tank experiment is presented which analyzes the waveform, power spectral density, and temporal variability of the transmitted waveform. The results of a second static experiment conducted from the Woods Hole Oceanographic Institution Pier in Woods Hole, Massachusetts permit determination of the distribution and moments of intensity fluctuations of echoes from objects imaged in side scan sonograms. This experiment also characterizes temporal and spatial coherence of intensity fluctuations. A third experiment is presented in which a side scan sonar towfish images the bottom adjacent to the pier while running along an underwater track which reduces towfish instability. Imagery from this experiment is used to develop a rectification and registration algorithm for side scan sonat images. Preliminary image processing is described and examples presented, followed by favorable results for automated image rectification and registration.
Submitted in partial fulfillment of the requirements for the degree of Ocean Engineer at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution August 1988
Showing items related by title, author, creator and subject.
Initial settlement of marine invertebrate larvae : the role of passive sinking in a near-bottom turbulent flow environment Hannan, Cheryl Ann (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1984-02)The hypothesis that planktonic larvae of benthic invertebrates sink through the water like passive particles in turbulent flows near the seabed was tested in the field using several groups of geometrically different ...
Vertical flux, ecology and dissolution of radiolaria in tropical oceans : implications for the silica cycle Takahashi, Kozo (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1981-11)Radiolarians which settle through the oceanic water column were recovered from three stations (western Tropical Atlantic-Station E, central Tropical Pacific-Pi and Panama Basin-PB) using PARLUX sediment traps in moored ...
King, Linda L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-11)This thesis examines the degradation pathways of chlorophyll in the Black Sea water column and sediments. Measurements are made of total chlorophyll in sediment traps from two locations and depths in the water column, ...