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J. Imaging 2016, 2(2), 14; doi:10.3390/jimaging2020014

A Foveon Sensor/Green-Pass Filter Technique for Direct Exposure of Traditional False Color Images

1
Alberta Sustainable Resource Development (ret.), Edmonton, AB T5K 2G6, Canada
2
Department of Physics, University of Alberta, Edmonton, AB T6G 2E1, Canada
*
Author to whom correspondence should be addressed.
Academic Editors: Carosena Meola and Gonzalo Pajares Martinsanz
Received: 20 January 2016 / Revised: 15 April 2016 / Accepted: 28 April 2016 / Published: 10 May 2016
View Full-Text   |   Download PDF [12034 KB, uploaded 10 May 2016]   |  

Abstract

A direct exposure technique to simulate the vegetation red-magenta hues associated with the traditional Kodak Ektachrome Professional Infrared EIR film is proposed. The method uses the Foveon sensor in full spectrum mode as found in Sigma cameras in combination with green-pass filters to reproduce the red-magenta hues of healthy vegetation without resorting to multi-exposures or channel swaps as is the current norm in single sensor cameras. An array of commercially available green-pass filters are analyzed via spectrophotmetric, densitometric and colorimetric measurements. A calibration technique using color-compensating filters is presented such that any green-pass filter will transmit green wavelengths to a set norm and ensure repeatability. A color model for the Foveon/green-pass filter is developed using quantum efficiencies to explain the color effects observed. Color similarities in near-infrared, blue and black and differences in red and green compared with Kodak Ektachrome Infrared film are discussed. Aerial photography examples are discussed, and the technique is proposed as a more direct means of obtaining traditional false color infrared imagery for pictorial and scientific applications when using Foveon type commercially available digital cameras. View Full-Text
Keywords: color infrared film; Foveon sensor; transmission spectrophotometry; green filter; CC filters; UAV; remote sensing; false color infrared color infrared film; Foveon sensor; transmission spectrophotometry; green filter; CC filters; UAV; remote sensing; false color infrared
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Fent, L.; Meldrum, A. A Foveon Sensor/Green-Pass Filter Technique for Direct Exposure of Traditional False Color Images. J. Imaging 2016, 2, 14.

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