Shutterless Fixed Pattern Noise Correction For Infrared Imaging Arrays

P. M. Narendra; N. A. Foss

doi:10.1117/12.931970

29 December 1981 Shutterless Fixed Pattern Noise Correction For Infrared Imaging Arrays

P. M. Narendra, N. A. Foss

Proceedings Volume 0282, Technical Issues in Focal Plane Development; (1981) https://doi.org/10.1117/12.931970
Event: 1981 Technical Symposium East, 1981, Washington, D.C., United States

Abstract

Staring infrared imagers typically exhibit large d.c. offset level variations and responsivity variations from pixel to pixel. In order to extract the scene information from the focal plane output signal, this characteristic fixed pattern noise must be normalized prior to display. Conventional techniques for this compensation involve the use of a uniform thermal reference source which is periodically introduced into the sensor field of view to act as a calibration of the offset and responsivity variations for each pixel. This viewing of a thermal reference source generally involves use of electromechanical or electro-optical shutters which detracts from the mechanical simplicity of the staring imager. A real-time compensation technique has been developed which utilizes the infrared (IR) scene itself for calibration and continually updates the compensation coefficients without the use of a thermal reference source or shutter. This "shutterless" compensation technique makes use of scene dynamics, averaged over a period of time, as an effective uniform reference source. The results of real-time simulations of this technique have been demonstrated using both FLIR and visible imagery. Results of these simulations are presented along with a discussion of applicable areas for this technique and approaches for real-time hardware implementation.

Citation Download Citation

P. M. Narendra and N. A. Foss "Shutterless Fixed Pattern Noise Correction For Infrared Imaging Arrays", Proc. SPIE 0282, Technical Issues in Focal Plane Development, (29 December 1981); https://doi.org/10.1117/12.931970

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