US 11,808,853 B2
Tracking device with improved work surface adaptability
Hui-Hsuan Chen, Hsin-Chu County (TW); Cheng-Lin Yang, Hsin-Chu County (TW); and Tzu-Yu Chen, Hsin-Chu County (TW)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on Mar. 21, 2022, as Appl. No. 17/699,404.
Application 17/185,263 is a division of application No. 16/800,187, filed on Feb. 25, 2020, granted, now 10,962,646.
Application 17/699,404 is a continuation of application No. 17/185,263, filed on Feb. 25, 2021, granted, now 11,307,308.
Application 16/800,187 is a continuation of application No. 15/841,376, filed on Dec. 14, 2017, granted, now 10,627,518.
Claims priority of provisional application 62/514,349, filed on Jun. 2, 2017.
Prior Publication US 2022/0206151 A1, Jun. 30, 2022
Int. Cl. G01S 17/50 (2006.01); G06T 7/521 (2017.01); H04N 23/56 (2023.01); H04N 5/33 (2023.01); G01S 17/66 (2006.01); G01S 7/481 (2006.01); G01S 17/46 (2006.01); G01S 7/48 (2006.01); H04N 23/51 (2023.01); G01S 17/48 (2006.01); G01S 17/08 (2006.01)
CPC G01S 17/66 (2013.01) [G01S 7/4808 (2013.01); G01S 7/4815 (2013.01); G01S 7/4816 (2013.01); G01S 17/46 (2013.01); G01S 17/50 (2013.01); G06T 7/521 (2017.01); H04N 23/51 (2023.01); H04N 23/56 (2023.01); G01S 17/08 (2013.01); G01S 17/48 (2013.01); G06T 2207/10004 (2013.01); G06T 2207/10152 (2013.01); H04N 5/33 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A tracking device, configured to detect displacement with respect to a work surface, the tracking device comprising:
an image sensor configured to output image frames;
an optical lens;
a first light source configured to emit light toward the work surface to generate reflected light that impinges on the image sensor without passing through the optical lens;
a second light source configured to emit light toward the work surface to generate scattered light that impinges on the image sensor passing through the optical lens; and
a processor configured to
control the image sensor to capture a first image frame in conjunction with turning on the first light source but turning off the second light source in a switching mode,
control the image sensor to capture a second image frame in conjunction with turning on the second light source but turning off the first light source in the switching mode,
identify that the work surface is a strong reflective surface upon the first image frame having an image feature better that the second image frame, and
identify that the work surface is a weak reflective surface upon the second image frame having the image feature better that the first image frame.