Real-Time Adaptive Contrast Enhancement For Imaging Sensors

P. M. Narendra; R. C. Fitch

doi:10.1117/12.956192

31 August 1978 Real-Time Adaptive Contrast Enhancement For Imaging Sensors

P. M. Narendra, R. C. Fitch

Proceedings Volume 0137, Airborne Reconnaissance III; (1978) https://doi.org/10.1117/12.956192
Event: 1978 Technical Symposium East, 1978, Washington, D.C., United States

Abstract

A new recursive filter approach greatly simplifies real time implementation of a local area adaptive contrast enhancement scheme for imaging sensors (FUR, TV). Local area contrast enhancement adaptively stretches the intensities in each local area of a scene to the display luminance dynamic range. Even scenes possessing large global dynamic ranges (>40 dB) can then be squeezed into the limited dynamic range (20 dB) of a display without losing the vital local area contrast essential for target acqui-sition. This paper describes the recursive filter implementation (using charge coupled devices) of the local area contrast enhancement scheme and the resultant real time hardware. This module can accept standard 525 and 875 line TV compatible video from any source (FLIR, Vidicon, Video Tape Recorder, etc. ). Several examples from video taped FUR imagery are included to demonstrate the effectiveness of this simple hardware.

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P. M. Narendra and R. C. Fitch "Real-Time Adaptive Contrast Enhancement For Imaging Sensors", Proc. SPIE 0137, Airborne Reconnaissance III, (31 August 1978); https://doi.org/10.1117/12.956192

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KEYWORDS

Video

Digital filtering

Forward looking infrared

Charge-coupled devices

Optical sensors

Contrast sensitivity

Airborne reconnaissance

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