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公开(公告)号：US20210033704A1
公开(公告)日：2021-02-04
申请号：US17064398
申请日：2020-10-06
Applicant: STMICROELECTRONICS, INC.
Inventor： Xiaoyong YANG , Rui XIAO , Arnaud DELEULE
Abstract: A time of flight range detection device includes a laser configured to transmit an optical pulse into an image scene, a return single-photon avalanche diode (SPAD) array, a reference SPAD array, a range detection circuit coupled to the return SPAD array and the reference SPAD array, and a laser driver circuit. The range detection circuit in operation determines a distance to an object based on signals from the return SPAD array and the reference SPAD array. The laser driver circuit in operation varies an output power level of the laser in response to the determined distance to the object.
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公开(公告)号：US20220333912A1
公开(公告)日：2022-10-20
申请号：US17856586
申请日：2022-07-01
Applicant: STMICROELECTRONICS, INC.
Inventor： Arnaud DELEULE , John E. KVAM , Kalyan-Kumar VADLAMUDI-REDDY
Abstract: The present disclosure is directed to a system and method of controlling a facial recognition process by validating preconditions with a ranging sensor. The ranging sensor transmits a ranging signal that is reflected off of a user's face and received back at the ranging sensor. The received ranging signal can be used to determine distance between the user's face and the mobile device or to determine the reflectivity of the user's face. Comparing the distance to a range of distances corresponding to normal operation of the device or normal reflectivities associated with human skin tones can reduce the number of false positive activations of the facial recognition process. Furthermore, a multiple zone ranging sensor can produce a face depth map that can be compared to a stored face depth map or can produce a reflectivity map that can be compared to a stored face reflectivity map to further increase power efficiency and device security.
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3.发明申请公开(公告)号：US20190212125A1
公开(公告)日：2019-07-11
申请号：US16224543
申请日：2018-12-18
Applicant: STMICROELECTRONICS, INC.
Inventor： Arnaud DELEULE , John E. KVAM , Kalyan-Kumar VADLAMUDI-REDDY
CPC classification number: G01B11/026 , G01C3/02 , G06K9/00281 , G06K9/00288 , G06T7/521 , H04N5/232121
Abstract: The present disclosure is directed to a system and method of controlling a facial recognition process by validating preconditions with a ranging sensor. The ranging sensor transmits a ranging signal that is reflected off of a user's face and received back at the ranging sensor. The received ranging signal can be used to determine distance between the user's face and the mobile device or to determine the reflectivity of the user's face. Comparing the distance to a range of distances corresponding to normal operation of the device or normal reflectivities associated with human skin tones can reduce the number of false positive activations of the facial recognition process. Furthermore, a multiple zone ranging sensor can produce a face depth map that can be compared to a stored face depth map or can produce a reflectivity map that can be compared to a stored face reflectivity map to further increase power efficiency and device security.
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公开(公告)号：US20170356981A1
公开(公告)日：2017-12-14
申请号：US15605611
申请日：2017-05-25
Applicant: STMICROELECTRONICS, INC.
Inventor： Xiaoyong YANG , Rui XIAO , Arnaud DELEULE
CPC classification number: G01S7/484 , G01S7/4868 , G01S17/10
Abstract: A time of flight range detection device includes a laser configured to transmit an optical pulse into an image scene, a return single-photon avalanche diode (SPAD) array, a reference SPAD array, a range detection circuit coupled to the return SPAD array and the reference SPAD array, and a laser driver circuit. The range detection circuit in operation determines a distance to an object based on signals from the return SPAD array and the reference SPAD array. The laser driver circuit in operation varies an output power level of the laser in response to the determined distance to the object.
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