公开(公告)号：US12117339B1

公开(公告)日：2024-10-15

申请号：US18464304

申请日：2023-09-11

Applicant: PIXART IMAGING INC.

Inventor： Tso-Sheng Tsai ,  Kuei-Yang Tseng ,  Yueh-Lin Chung

IPC: G01J1/44

CPC classification number: G01J1/44 ,  G01J2001/4466

Abstract: There is provided an optical sensor including an SPAD pixel array, multiple counters and a processor. The multiple counters count photon events of the SPAD pixel array to output an event-based vision sensor (EVS) frame per EVS period. The processor determines an index state of each pixel of the SPAD pixel array by comparing a counting value of each pixel respectively at a predetermined number of checking points with two predetermined thresholds, and calculates an index change of the index state associated with each pixel between adjacent EVS frames. The processor further changes the EVS period and/or adds a count offset to the counting value of each pixel to improve sensitivity of the event-based vision sensor.