US 11,885,880 B2
Unwrapped phases for time-of-flight modulation light
Zhanping Xu, Sunnyvale, CA (US)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed on Jul. 31, 2019, as Appl. No. 16/528,472.
Prior Publication US 2021/0033731 A1, Feb. 4, 2021
Int. Cl. G06V 10/143 (2022.01); G01S 17/36 (2006.01); H04N 13/254 (2018.01); G01S 7/4915 (2020.01); G01S 17/89 (2020.01); G06T 7/50 (2017.01); G06V 10/141 (2022.01)
CPC G01S 17/36 (2013.01) [G01S 7/4915 (2013.01); G01S 17/89 (2013.01); G06T 7/50 (2017.01); G06V 10/141 (2022.01); G06V 10/143 (2022.01); H04N 13/254 (2018.05); G06T 2207/10028 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for a time-of-flight camera, comprising:
illuminating a scene with modulation light having two or more frequencies that do not have a common integer denominator;
at a sensor array, receiving the modulation light reflected off objects within the scene; and
determining unwrapped phases for each of the two or more frequencies of modulation light by at least:
processing the received modulation light to determine wrapped phase vectors for each frequency of modulation light;
converting the wrapped phase vectors to phase scalars in a complex domain; and
determining unwrapped phases in the complex domain based on the phase scalars.