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

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.

Citation Download Citation

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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