Distance detection by global shutter image sensor
View Patent ↗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.
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.
2. 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.