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Image enhancement for noisy color imagery

Author: Dijk, J. · Hollander, R.J.M. den
Type:article
Date:2008
Publisher: SPIE
Place: Bellingham, WA
Institution: TNO Defensie en Veiligheid · DenV
Source:Huckridge, D.A.Ebert, R.R., Electro-Optical and Infrared Systems: Technology and Applications V, 16 September 2008, Cardiff, Whales, UK.
series:
Proceedings of SPIE
Identifier: 28545
doi: doi:doi:doi10.1117/12.800274
Article number: 71131A
Keywords: Physics · Image enhancement · Contrast enhancement · Image processing · Noise reduction · CCD cameras · Night vision · Colour information

Abstract

Recently new techniques for night vision cameras are developed. So-called EMCCD cameras are able to record color information about the scene. However, in low-light situations this imagery becomes noisy. This is also the case for normal CCD cameras in dark situations or in shadowed areas. In this paper we present image enhancement techniques for noisy color imagery. The techniques are based on grey-value image enhancement techniques, in particular dynamic super-resolution reconstruction, which is used to enhance the lightness of the image, and local adaptive contrast enhancement. With the super-resolution technique the temporal noise in the lightness channel of the imagery is removed. The color information of the images is spatially filtered using the edge information of the enhanced lightness image. The result is colored output imagery with reduced temporal noise