公开(公告)号：US20250008232A1

公开(公告)日：2025-01-02

申请号：US18342965

申请日：2023-06-28

Applicant: STMicroelectronics International N.V.

Inventor： Stuart McLeod ,  Andreas Assmann

IPC: H04N25/46

Abstract: A method of operating a time-of-flight (ToF) ranging system includes: transmitting, by an emitter, a light signal toward one or more targets; receiving, by a ToF sensor, the light signal reflected by the one or more targets; generating a histogram based on the received light signal; estimating gradients of histogram bins of the histogram by computing differences between adjacent histogram bins; identifying one or more pulse regions in the histogram; finding, in a pulse region, a rising edge having a gradient that is larger than a pre-determined threshold or is a maximum gradient in the pulse region, where the rising edge is a leftmost rising edge in the pulse region having the gradient; fine-tuning a location of the rising edge; and computing an estimate of a distance of a target in the pulse region by adding a pre-determined offset to a distance of the rising edge.

公开(公告)号：US20240288557A1

公开(公告)日：2024-08-29

申请号：US18176163

申请日：2023-02-28

Applicant: STMicroelectronics International N.V.

Inventor： Stuart McLeod ,  Andreas Assmann

IPC: G01S7/4865 ,  G01S7/48 ,  G01S17/89

CPC classification number: G01S7/4865 ,  G01S7/4808 ,  G01S17/89

Abstract: A method of determining a distance of a closest target using a time-of-flight (ToF) ranging system includes: receiving, by a processor, a histogram generated by a ToF imager of the ToF ranging system, where the ToF imager is configured to transmit a light pulse for ranging purpose; finding a first rising edge in the histogram that corresponds to a rising edge of a reflected light pulse from the closest target; and calculating a first estimate of the distance of the closest target by adding a pre-determined offset to a distance of the first rising edge.