US 11,812,169 B2
Dynamic vision sensor with in-pixel digital change detection
Christian Brändli, Baden (CH); and Raphael Berner, Confignon (CH)
Assigned to Sony Advanced Visual Sensing AG, Schlieren (CH)
Appl. No. 17/609,437
Filed by Sony Advanced Visual Sensing AG, Schlieren (CH)
PCT Filed May 8, 2020, PCT No. PCT/IB2020/054399
§ 371(c)(1), (2) Date Nov. 8, 2021,
PCT Pub. No. WO2020/229981, PCT Pub. Date Nov. 19, 2020.
Claims priority of provisional application 62/846,287, filed on May 10, 2019.
Prior Publication US 2022/0239851 A1, Jul. 28, 2022
Int. Cl. H04N 25/50 (2023.01); H04N 25/771 (2023.01); H04N 25/772 (2023.01)
CPC H04N 25/50 (2023.01) [H04N 25/771 (2023.01); H04N 25/772 (2023.01)] 18 Claims
OG exemplary drawing
 
11. An optical sensing method for an optical sensor, comprising:
detecting received light and comparing resulting signals to a ramp voltage in pixels of the optical sensor;
storing current counts that are related to the ramp voltage;
storing previous counts;
comparing a difference between the current counts and the previous counts to at least one event threshold; and
comparing a difference between the current counts and the previous counts to an ON event threshold and an OFF event threshold.