US 12,014,567 B1
Finger detection device and operating method thereof
Yu-Ju Lee, Hsin-Chu County (TW); and Tzung-Min Su, Hsin-Chu County (TW)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PIXART IMAGING INC., Hsin-Chu County (TW)
Filed on May 17, 2023, as Appl. No. 18/318,723.
Int. Cl. G06V 40/13 (2022.01); G06V 40/12 (2022.01); H04N 23/71 (2023.01); H04N 23/72 (2023.01); H04N 23/73 (2023.01); H04N 23/74 (2023.01); H04N 25/50 (2023.01); G06V 40/10 (2022.01)
CPC G06V 40/13 (2022.01) [G06V 40/1353 (2022.01); H04N 23/71 (2023.01); H04N 23/72 (2023.01); H04N 23/73 (2023.01); H04N 23/74 (2023.01); H04N 25/50 (2023.01); G06V 40/15 (2022.01)] 20 Claims
OG exemplary drawing
 
1. A finger detection device, comprising:
a light source, configured to emit light toward a sensing surface of the finger detection device;
a light sensor, configured to acquire a first image frame and a second image frame toward the sensing surface; and
a processor, configured to
calculate a difference of the first image frame and the second image frame to generate a differential image frame,
determine a covered region in the differential image frame,
identify whether the covered image is a finger region, and
determine different windows of interest (WOIs) corresponding to different functions upon the covered region being the finger region.