Title
Improved colour matching technique for fused nighttime imagery with daytime colours
Author
Hogervorst, M.A.
Toet, A.
Contributor
Huckridge, D.A. (editor)
Ebert, R. (editor)
Lee, S.T. (editor)
Publication year
2016
Abstract
Previously, we presented a method for applying daytime colours to fused nighttime (e.g., intensified and LWIR) imagery (Toet and Hogervorst, Opt.Eng. 51(1), 2012). Our colour mapping not only imparts a natural daylight appearance to multiband nighttime images but also enhances the contrast and visibility of otherwise obscured details. As a result, this colourizing method leads to increased ease of interpretation, better discrimination and identification of materials, faster reaction times and ultimately improved situational awareness (Toet e.a., Opt.Eng.53(4), 2014). A crucial step in this colouring process is the choice of a suitable colour mapping scheme. When daytime colour images and multiband sensor images of the same scene are available the colour mapping can be derived from matching image samples (i.e., by relating colour values to sensor signal intensities). When no exact matching reference images are available the colour transformation can be derived from the first-order statistical properties of the reference image and the multiband sensor image (Toet, Info. Fus. 4(3), 2003). In the current study we investigated new colour fusion schemes that combine the advantages of the both methods, using the correspondence between multiband sensor values and daytime colours (1st method) in a smooth transformation (2nd method). We designed and evaluated three new fusion schemes that focus on: i) a closer match with the daytime luminances, ii) improved saliency of hot targets and iii) improved discriminability of materials © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).
Subject
Long wavelength infrared
Infrared
Sensors
Image Intensifier
Visualization
Color
Flow visualization
Image intensifiers (solid state)
Image matching
Infrared devices
Infrared radiation
Mapping
Colour mapping
Matching techniques
Night vision
Sensor fusion
Situational awareness
Smooth transformation
Statistical properties
Thermal sensors
Color image processing
Defence, Safety and Security
Human & Operational Modelling
PCS - Perceptual and Cognitive Systems
ELSS - Earth, Life and Social Sciences
To reference this document use:
http://resolver.tudelft.nl/uuid:89a02918-d934-42f1-861c-ab2f825f85d9
DOI
https://doi.org/10.1117/12.2241627
TNO identifier
574793
Publisher
SPIE
Source
Electro-Optical and Infrared Systems: Technology and Applications XIII
Series
SPIE Proceedings
Document type
conference paper