Time of flight camera system
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United States of America Patent
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Aug 8, 2017
Grant Date -
Apr 16, 2015
app pub date -
Apr 26, 2013
filing date -
May 21, 2012
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Abstract
A light transit time camera system and method for operating such a system which can be operated with at least three modulation frequencies, having the steps a) determining a phase shift (φi) of an emitted signal (Sp1) and a received signal (Sp2) for a modulation frequency (f1, f2, f3) in a phase-measuring cycle (PM1, PM2, . . . ), b) carrying out a plurality of phase-measuring cycles (PM1, PM2, . . . ), c) determining a distance value (dn,n+1) on the basis of the phase shifts (φn, φn+1) determined in two successive phase-measuring cycles (PMn, PMn+1), in a distance-measuring cycle (M1, M2, . . . ), d) carrying out a plurality of distance-measuring cycles (M1, M2, . . . ), e) determining a distance deviation (Δd) between the distance values of successive distance-measuring cycles, f) outputting of a distance value (dn,n+1) as a valid distance value if the distance deviation (Δd) is within a tolerance limit (Δdtol) is provided.
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