Systematic non-linearity for multiple distributed illumination units for time-of-flight (PMD) cameras

The non-linearity of phase and amplitude of time-of-flight cameras' measurements with a single, usually coaxial illumination unit has been discussed excessively in literature. This effect is calibrated using a number of different approaches (B-Splines, polynomial approximation or with infinite Fourier series). In this paper, this concept is extended to the calibration of multiple distributed illumination units used simultaneously.

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