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    Estimation and correction of geometric distortions in side-scan sonar images

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    Cobra_thesis.pdf (28.02Mb)
    Date
    1990-03
    Author
    Cobra, Daniel Távora de Queiroz  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5426
    DOI
    10.1575/1912/5426
    Keyword
     Underwater acoustics; Asterias (Ship : 1980-2004) Cruise 
    Abstract
    This thesis introduces a new procedure for the enhancement of acoustic images of the bottom of the sea produced by side-scan sonars. Specifically, it addresses the problem of estimating and correcting geometric distortions frequently observed in such images as a consequence of motion instabilities of the sonar array. This procedure estimates the geometric distortions from the image itself, without requiring any navigational or attitude measurements. A mathematical model for the distortions is derived from the geometry of the problem, and is applied to estimates of the local degree of geometric distortion obtained by cross-correlating segments of adjacent lines of the image. The model parameters are then recursively estimated through deterministic least-squares estimation. An alternative approach based on adaptive Kalman filtering is also proposed, providing a natural framework in which a priori information about the array dynamics may be easily incorporated. The estimates of the parameters of the distortion model are used to rectify the image, and may also be used for estimating the attitude parameters of the array. A simulation is employed to evaluate the effectiveness of this technique and examples of its application to high-resolution side-scan sonar images are provided.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution March 1990
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    • WHOI Theses
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Thesis: Cobra, Daniel Távora de Queiroz, "Estimation and correction of geometric distortions in side-scan sonar images", 1990-03, DOI:10.1575/1912/5426, https://hdl.handle.net/1912/5426
     

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