An innovative real time system for infrared focal plan array image enhancement based on FPGA

Ehsan Koohestani; Ali Homaei

doi:10.1117/12.753721

27 February 2008 An innovative real time system for infrared focal plan array image enhancement based on FPGA

Ehsan Koohestani, Ali Homaei

Author Affiliations +

Proceedings Volume 6811, Real-Time Image Processing 2008; 68110O (2008) https://doi.org/10.1117/12.753721
Event: Electronic Imaging, 2008, San Jose, California, United States

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.

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Ehsan Koohestani and Ali Homaei "An innovative real time system for infrared focal plan array image enhancement based on FPGA", Proc. SPIE 6811, Real-Time Image Processing 2008, 68110O (27 February 2008); https://doi.org/10.1117/12.753721

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