# US 10,768,300 B2 · Distance detection by global shutter image sensor

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- Number: US 10,768,300 B2
- Document ID: US10768300B2
- Status: Granted
- Kind: B2
- Application number: 15/815,486
- Filed: 2017-11-16
- Published: 2019-01-31
- Granted: 2020-09-08
- Earliest claimed: 2017-11-16
- Assignees: Black Sesame International Holding Limited
- Applicants: Black Sesame Technologies Inc.
- Inventors: Jizhang Shan; Kuochin Chang
- Web page: https://patentgrep.com/patent/US10768300B2

## CPC

- G01S 17/10: using transmission of interrupted, pulse-modulated waves (determination of distance by phase measurements G01S17/32)
- G01S 7/4865: Time delay measurement, e.g. time-of-flight measurement, time of arrival measurement or determining the exact position of a peak (peak detection in noise, signal conditioning G01S7/487)
- G01S 17/894: Three-dimensional [3D] imaging with simultaneous measurement of time-of-flight at a two-dimensional [2D] array of receiver pixels, e.g. time-of-flight cameras or flash lidar
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A method of detecting a distance, comprising emitting an optical pulse, receiving at a first detector a reflected optical pulse, from a first exposure start time to a first exposure finish time, generating a first detector signal, receiving at an n-th detector the reflected optical pulse, from an n-th exposure start time to an n-th exposure finish time, generating an n-th detector signal, wherein the first exposure start time begins before the n-th exposure start time and the first exposure finish time ends before the n-th exposure finish time and the first exposure duration partially overlaps the n-th exposure duration and determining the distance of an object based on the first detector signal and the n-th detector signal.

## Claims

### Claim 1

A method of detecting a distance, comprising:
emitting an optical pulse, the optical pulse having a pulse beginning time and a pulse ending, time;
receiving at a first detector a reflected optical pulse, wherein the optical pulse is detected at the first detector from a first exposure start time to a first exposure finish time and has a first exposure duration;
generating a first detector signal based on a first response of the first detector to the reflected optical pulse;
receiving an n-th detector the reflected optical pulse, wherein the optical pulse is detected at the n-th detector from an n-th exposure start time to an n-th exposure finish time and has an n-th exposure duration;
generating an n-th detector signal based on an n-th response of the n-th detector to the reflected optical pulse;
receiving at an m-th detector the reflected optical pulse, wherein the optical pulse is detected at the m-th detector from an m-th exposure start time to an m-th exposure finish time and has an m-th exposure duration;
generating an m-th detector signal based on an n-th response of the n-th detector to the reflected optical pulse;
wherein the n-th exposure start time begins after the first exposure start time and the m-th exposure start time begins before the first exposure start time and the n-th exposure finish time and the m-th exposure finish time end after the first exposure finish time and the first exposure duration partially overlaps the n-th exposure duration and the first exposure duration is within the m-th exposure duration; and
determining the distance of an object based on the first detector signal, the n-th detector signal and the m-th detector signal.

### Claim 2 (depends on 1)

The method of claim 1 wherein the determining of distance is based on intensity of the first detector signal, intensity of the n-th detector signal and intensity of the m-th detector signal.