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Proceedings Paper

Very low cost real time histogram-based contrast enhancer utilizing fixed-point DSP processing
Author(s): Nathaniel J. McCaffrey; Francis P. Pantuso
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Paper Abstract

A real time contrast enhancement system utilizing histogram- based algorithms has been developed to operate on standard composite video signals. This low-cost DSP based system is designed with fixed-point algorithms and an off-chip look up table (LUT) to reduce the cost considerably over other contemporary approaches. This paper describes several real- time contrast enhancing systems advanced at the Sarnoff Corporation for high-speed visible and infrared cameras. The fixed-point enhancer was derived from these high performance cameras. The enhancer digitizes analog video and spatially subsamples the stream to qualify the scene's luminance. Simultaneously, the video is streamed through a LUT that has been programmed with the previous calculation. Reducing division operations by subsampling reduces calculation- cycles and also allows the processor to be used with cameras of nominal resolutions. All values are written to the LUT during blanking so no frames are lost. The enhancer measures 13 cm X 6.4 cm X 3.2 cm, operates off 9 VAC and consumes 12 W. This processor is small and inexpensive enough to be mounted with field deployed security cameras and can be used for surveillance, video forensics and real- time medical imaging.

Paper Details

Date Published: 12 March 1998
PDF: 8 pages
Proc. SPIE 3303, Real-Time Imaging III, (12 March 1998); doi: 10.1117/12.302424
Show Author Affiliations
Nathaniel J. McCaffrey, Sarnoff Corp. (United States)
Francis P. Pantuso, Sarnoff Corp. (United States)


Published in SPIE Proceedings Vol. 3303:
Real-Time Imaging III
Divyendu Sinha, Editor(s)

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