G rect - Une boite à outils Matlab pour géoréférencer des images

Introduction

This toolbox contains a series of Matlab functions for georectifying highly oblique digital images. This is useful in oceanography for obtaining quantitative information on sea-surface patterns such as those induced by internal waves, fronts or sea-ice.

Although this toobox was initially developed to georectify geophysical images it can be used just as well for rectifying laboratory images. The following images show examples of such image rectifications.

Example of a geophysical photo showing sea-ice distribution in the St. Lawrence Estuary.

Same as previous photo once georectified.

Example of a laboratory basin photo.

Same as previous once georectified.

How to get the package

svn co http://bourda02@demeter.uqar.ca/svn/g_rect/trunk

How to use the package

Once expanded the g_rect package is organized as follow:

• g_rext_package
  • src (the source codes)
    • g_rect (contains the mains georectification functions)
    • g_calib (contains camera calibration functions)
    • g_stabilize (contains image stabilization functions)
  • Examples
    • Field (a field example)
    • Lab (a lab example)

References

• Bourgault (2008), Shore-based photogrammetry of river ice, Canadian Journal of Civil Engineering Media:Bourgault_2008.pdf.
• Bourgault et al (2011), Field observations of a large-amplitude internal wavetrain and its reflection off a steep slope, Journal of Physical Oceanography Media:Bourgault_et_al_2011a.pdf .
• Farid and Woodward (2007), Video stabilization and enhancement, Unpublished Media:Farid_Woodward_2007.pdf .
• Pawlowicz (2003), Quantitative visualization of geophysical flows using low-cost oblique digital time-lapse imaging, IEEE Journal of Oceanic Engineering Media:Pawlowicz_2003.pdf.