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Subpixel image registration for coherent change detection between two high resolution sonar passes

Isabelle Quidu 1 Vincent Myers 2 Øivind Midtgaard 3 Roy Edgar Hansen 3
1 Lab-STICC_ENSTAB_CID_SFIIS ; OSM
STIC - Pôle STIC [Brest], Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : The use of phase coherence between two pings is used in many underwater imaging applications, in particular the micronavigation algorithms used in correcting receiver positions when focussing a synthetic aperture sonar (SAS) array. Recently, interest has turned to using the phase coherence between two sonar images that consist of two repeated passes over the same area in order to co-register the images and perform coherent change detection, meaning the detection of differences in two areas that causes a decorrelation between the two images. Such techniques are used in synthetic aperture radar (SAR) applications, and can detect subtle changes that are not immediately detectable by visual inspection or other traditional methods. Before computing the coherence the two images have to be accurately co-registered. Indeed remaining misregistrations after a 2D rigid translation lead to a loss of phase coherence. This can be due to navigational disturbances or data processing defects. The problem of non-rigid and subpixel sonar image registration is achieved here in two main steps. The first step aims to estimate the displacement field from which a warping function is derived; then, the repeat-pass image is resampled using the warping function to co-register it to primary image
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https://hal-ensta-bretagne.archives-ouvertes.fr/hal-00777127
Contributeur : Annick Billon-Coat <>
Soumis le : mercredi 16 janvier 2013 - 18:32:13
Dernière modification le : jeudi 19 décembre 2019 - 01:26:36

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  • HAL Id : hal-00777127, version 1

Citation

Isabelle Quidu, Vincent Myers, Øivind Midtgaard, Roy Edgar Hansen. Subpixel image registration for coherent change detection between two high resolution sonar passes. ICoURS'12, Oct 2012, Brest, France. ⟨hal-00777127⟩

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