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Proceedings Paper

Digital image processing in high resolution infrared camera with use of programmable logic device
Author(s): Tomasz Sosnowski; Grzegorz Bieszczad; Mariusz Kastek; Henryk Madura
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Paper Abstract

In article a digital system for high resolution infrared camera control and image processing is described. The camera is built with use of bolometric focal plane array of size 640 by 480 detectors. Single detector in array has size of 25 μm and can detect incident radiation from the spectral range of 8÷12 μm thanks to the special filter installed in specially designed entrance window. The most important tasks of infrared image processing system are array readout and correction of detectors offset and responsivity variations. The next tasks of the system are conversion of analog voltage signals from microbolometers in array to digital form and then composition of a thermal image. Microbolometer array needs to be controlled via several signals. The signal generator for readout circuit is capable of changing various timing parameters like frame rate or integration time of the detector array. The changes in these parameters can be done via special set of memory mapped registers. The infrared data received from detector array is transferred via data bus to modules performing image processing, for example techniques for image enhancement. Image processing algorithms necessary for infrared image generation are nonuniformity correction, bad pixel replacement and radiometric calibration. Optionally an additional image processing techniques can be performed like edge enhancement, dynamic range compression or object identification. The elaborated architecture of the system allowed easy change of parameters of the system and to adopt many new algorithms without significant hardware changes. Scientific work funded from science fund for years 2009-2011 as a development project.

Paper Details

Date Published: 12 October 2010
PDF: 11 pages
Proc. SPIE 7838, Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII, 78380U (12 October 2010); doi: 10.1117/12.865026
Show Author Affiliations
Tomasz Sosnowski, Military Univ. of Technology (Poland)
Grzegorz Bieszczad, Military Univ. of Technology (Poland)
Mariusz Kastek, Military Univ. of Technology (Poland)
Henryk Madura, Military Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 7838:
Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII
Colin Lewis; Roberto Zamboni; François Kajzar; Doug Burgess; Emily M. Heckman, Editor(s)

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