Nonuniformity correction and restoration of passive millimeter-wave images

Alan H. Lettington; Sophie Tzimopoulou; Malcolm P. Rollason

doi:10.1117/12.353001

14 July 1999 Nonuniformity correction and restoration of passive millimeter-wave images

Alan H. Lettington, Sophie Tzimopoulou, Malcolm P. Rollason

Proceedings Volume 3703, Passive Millimeter-Wave Imaging Technology III; (1999) https://doi.org/10.1117/12.353001
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

This paper discusses methods of improving the quality and resolution of passive mm-wave images, particularly those obtained using the DERA MITRE imager and the more recent MERIT imager. This later real time imager consists of some novel optics followed by a conical scanner in the form of a disk rotating about an axis through its center and tilted with respect to its normal. A horizontal array of receivers is scanned such that each receiver performs a conical scan pattern in the scene. The resulting image which has a 40 degree by 20 degree field of view, consists of a series of circles whose centers are uniformly displaced horizontally. Each receiver is calibrated initially using a two point correction but then drifts in time and a scene based correction is applied. Following this pre-processing the images are superresolved using nonlinear restoration techniques. These various processes are described and images presented.

Citation Download Citation

Alan H. Lettington, Sophie Tzimopoulou, and Malcolm P. Rollason "Nonuniformity correction and restoration of passive millimeter-wave images", Proc. SPIE 3703, Passive Millimeter-Wave Imaging Technology III, (14 July 1999); https://doi.org/10.1117/12.353001

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