Multiscale target manifold characterization for 3D imaging ladar
Manifold extraction techniques, such as ISOMAP, are capable of
projecting nonlinear, high-dimensional data to a lower-dimensional
subspace while retaining discriminatory information. In this
investiga...
Simulation of a new 3D imaging sensor for identifying difficult military targets
This paper reports the successful application of automatic target
recognition and identification (ATR/I) algorithms to simulated 3D
imagery of 'difficult' military targets. QinetiQ and Selex S&AS ...
Calibration of full-waveform airborne laser scanning data for object classification
Proc. SPIE, Vol. 6950, 69500H (2008);
DOI:10.1117/12.781086
Online Publication Date: 16 April 2008
Conference Date: Wednesday 19 March 2008
Conference Location: Orlando, FL, USA
Conference Title: Laser Radar Technology and Applications XIII
Conference Chairs: Monte D. Turner, Gary W. Kamerman
Small-footprintairborne laser scanners with waveform-digitizing capabilities are becoming increasingly available.Waveform-digitizing laser scanners seize the physical measurement process in itsentire complexity. This leads the way to the possibility ofderiving the backscatter cross section which is a measure ofthe electromagnetic energy intercepted and reradiated by objects. The crosssection can be obtained by firstly decomposing the echo waveformin several distinct echoes, whereas for each echo its range,amplitude and width are known. Then the radar equation canbe used for calibrating the waveform measurements using external referencetargets with known backscatter cross sections. The final outcome isa 3D point cloud where each point represents one scattererwith a given cross section and echo width. Using thesephysical attributes and various geometric criteria the point cloud canbe segmented or classified. In this paper this procedure isdemonstrated based on waveform measurements acquired by the RIEGL LMS-Q560sensor. The cross section of the homogenous reference targets isestimated with a RIEGL reflectometer and Spectralon® targets.
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