15 November 2000 Calibration requirements and the impact of bit depth for digital cameras used as imaging polarimeters
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Abstract
Digital cameras can be used as imaging polarimeters, as previously reported. Comparisons of the radiometric characteristics of three-band digital cameras with eight- and ten- bit radiometric precision, which we have used as imaging polarimeters are made. We also discuss preliminary calibrations on a hyperspectral imaging polarimeter based upon a 16-bit camera and an LCD tunable filter. Examples are shown to illustrate the camera radiometric characteristics and the types of calibration procedure needed for imaging polarimetry in natural and in artificial light. Procedures using primary and secondary calibration standards are discussed. The impacts of radiometric fall-off with increasing field angle and band-dependent and intensity-dependent asymmetries experienced with the hyperspectral polarimeter are discussed. We present some examples of the detail afforded in artificial illumination by cameras offering 8-bit and 12-bit radiometric depth. The importance of multiband polarimetric images, which has been stressed before is again demonstrated for artificially illuminated scenarios.
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Michael J. Duggin, Richard Jayne, Richard S. Loe, Jonathan Gregory, "Calibration requirements and the impact of bit depth for digital cameras used as imaging polarimeters", Proc. SPIE 4133, Polarization Analysis, Measurement, and Remote Sensing III, (15 November 2000); doi: 10.1117/12.406625; https://doi.org/10.1117/12.406625
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