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Digital Camera Calibration for Luminance Estimation in Nighttime Visibility Studies
Technical Paper
2007-01-0718
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Estimation of target-to-background luminance ratios is a powerful method by which human detection of objects can be assessed. In the forensic community, evaluation of the detectability of a pedestrian to an automobile driver is often of interest. With calibration, the modern digital camera employing a CCD or CMOS light collection device can be a convenient and economical luminance estimation tool. Certain CCD or CMOS sensors will linearly report the impinging incident light pixel by pixel over a range of intensities. The device becomes nonlinear at low and high intensities; however, the linear region can be adjusted to the specific lighting conditions of interest by modifying the shutter speed, ISO setting, and aperture size. Image noise, sensor non-uniformity, temperature sensitivity, camera color sensitivity, and the spectral power distribution of the illuminant require treatment for direct comparison to the luminance. The techniques, procedure, and post-processing outlined demonstrates the use of a calibrated digital camera for the quantitative estimation of luminance.
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Citation
Allin, B., Ising, K., and King, D., "Digital Camera Calibration for Luminance Estimation in Nighttime Visibility Studies," SAE Technical Paper 2007-01-0718, 2007, https://doi.org/10.4271/2007-01-0718.Also In
SAE 2007 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V116-6; Published: 2008-08-15
Number: V116-6; Published: 2008-08-15
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