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Proceedings Paper

An innovative real time system for infrared focal plan array image enhancement based on FPGA
Author(s): Ehsan Koohestani; Ali Homaei
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Paper Abstract

The conceptual configuration and special features of a new high-precision real-time signal processing system for a Cooled Infrared Focal Plan Array with 320×240 detectors is presented in this note. The most critical case in the image detectors based on array elements is the Non-Uniformity Correction (NUC) between the sensitive elements due to the different characteristics of the materials in fabrication phase, especially for the IRFPAs with high elements which their non-uniformities are inherently more severe. It is the case that a mechanism for NUC between the sensitive elements needs a structure for compensation of gradual drift in the detectors' output by update the correction factors in a regular way. A feasible method, Least-Mean-Square under a compact hardware is introduced. The correction formula deduced from this approach is the best approximation polynomial of the analytic formula through theoretical analysis. Inherently, the intended detector has not a suitable timing for sending out for standard display equipments, so it is essential to have hardware for frame-to-frame grab which can help for processing applications too. Applying a capability of the sophisticated FPGAs, the contrast enhancement based on Bi-Histogram Equalization which preserves the brightness of infrared image precisely is described.

Paper Details

Date Published: 27 February 2008
PDF: 9 pages
Proc. SPIE 6811, Real-Time Image Processing 2008, 68110O (27 February 2008);
Show Author Affiliations
Ehsan Koohestani, Rayan Electronic Farda Co. (Iran)
Ali Homaei, Rayan Electronic Farda Co. (Iran)
Azad Univ. (Iran)

Published in SPIE Proceedings Vol. 6811:
Real-Time Image Processing 2008
Nasser Kehtarnavaz; Matthias F. Carlsohn, Editor(s)

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