US 12,066,545 B2
Power-efficient hand tracking with time-of-flight sensor
David Cohen, Nesher (IL); Elad Joseph, Atlit (IL); Eyal Preter, Givat Ela (IL); Paul Lacey, Plantation, FL (US); Koon Keong Shee, Miramar, FL (US); and Evyatar Bluzer, Yuvalim (IL)
Assigned to Magic Leap, Inc., Plantation, FL (US)
Filed by Magic Leap, Inc., Plantation, FL (US)
Filed on Mar. 23, 2021, as Appl. No. 17/210,152.
Claims priority of provisional application 62/994,152, filed on Mar. 24, 2020.
Prior Publication US 2021/0302587 A1, Sep. 30, 2021
Int. Cl. G01S 17/894 (2020.01); G06F 3/01 (2006.01); G06F 3/03 (2006.01)
CPC G01S 17/894 (2020.01) [G06F 3/017 (2013.01); G06F 3/0325 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating a time-of-flight (TOF) sensor, the method comprising:
operating the TOF sensor in a low power mode by repeatedly performing a low power mode sequence, wherein performing the low power mode sequence includes:
performing a depth frame, wherein performing the depth frame includes emitting light pulses, detecting reflected light pulses, and computing a depth map based on the detected reflected light pulses; and
performing an amplitude frame at least one time, wherein performing the amplitude frame includes emitting a light pulse, detecting a reflected light pulse, and computing an amplitude map based on the detected reflected light pulse;
determining that an activation condition is satisfied; and
in response to determining that the activation condition is satisfied, switching from operating the TOF sensor in the low power mode to operating the TOF sensor in a high accuracy mode by repeatedly performing a high accuracy mode sequence, wherein performing the high accuracy mode sequence includes:
performing the depth frame multiple times.