TOF depth sensor based on laser speckle projection and distance measuring method thereof

摘要

The present disclosure relates to a ToF depth sensor based on laser speckle projection. The ToF depth sensor includes a laser projector, which is used for projecting periodic infrared laser signals with phase information to the detected space; a diffraction optical element (DOE), which is used for uniformly distributing a beam of incident infrared laser signals into L beams of emergent infrared laser signals, enabling each beam of the emergent infrared laser signals to carry respective phase information, as well as the beam diameter, divergence angle and wavefront of the emergent infrared laser signals to be identical with those of the incident infrared laser signals, while only changing the transmission direction and controlling coded patterns projected out by laser speckles; and an image sensor, which is used for calculating depth information of a measured object by matching the laser speckles with pixel points of the image sensor.