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26 August 1998 Characterization of thermal staring imagers with multielement fractal test targets
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Non isoplanatism and aliasing properties of undersampled staring array cameras make their resolution measurement difficult. In this paper, two MTF assessment methods are presented, thanks to specific gray-level test targets, composed of a set of wavelet patterns distributed according to a fractal algorithm. First, a random multiscale wavelet pattern distribution allows a statistical averaged measurement of the camera point spread function, providing an averaged global MTF. The second method consists in setting the measurement free from the aliasing effects. Its aim is to reconstruct the optical and detector MTF, but also the frequency response of the reconstruction filter. This method uses a steady distribution of wavelet patterns and is based on the shape distortion analyse of the output wavelet patterns from the camera. The image processing analyse procedure provides an automatic measurement technique without mechanical adjustment requirements. The feasibility of the second method is checked by a computer simulation of a modelled camera measurement.
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Stephane Landeau "Characterization of thermal staring imagers with multielement fractal test targets", Proc. SPIE 3377, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing IX, (26 August 1998);

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