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Proceedings Paper

Real-Time Adaptive Contrast Enhancement For Imaging Sensors
Author(s): P. M. Narendra; R. C. Fitch
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Paper 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.

Paper Details

Date Published: 31 August 1978
PDF: 7 pages
Proc. SPIE 0137, Airborne Reconnaissance III, (31 August 1978); doi: 10.1117/12.956192
Show Author Affiliations
P. M. Narendra, Honeywell, Inc. (United States)
R. C. Fitch, Honeywell, Inc. (United States)

Published in SPIE Proceedings Vol. 0137:
Airborne Reconnaissance III
John H. Smith; Theodore C. Freitag, Editor(s)

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