US 12,284,448 B2
Optical distance measurement system with dynamic exposure time
Guo-Zhen Wang, Hsin-Chu County (TW); and Shiaw-Yu Jou, Hsin-Chu County (TW)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on Dec. 15, 2022, as Appl. No. 18/081,731.
Application 18/081,731 is a continuation of application No. 17/141,339, filed on Jan. 5, 2021, granted, now 11,558,554.
Application 17/141,339 is a continuation of application No. 16/012,982, filed on Jun. 20, 2018, granted, now 10,917,581.
Application 16/012,982 is a continuation of application No. 14/962,214, filed on Dec. 8, 2015, granted, now 10,033,937.
Claims priority of application No. 104101160 (TW), filed on Jan. 13, 2015.
Prior Publication US 2023/0120133 A1, Apr. 20, 2023
Int. Cl. H04N 23/73 (2023.01); G01C 3/08 (2006.01); G01S 7/486 (2020.01); G01S 7/4912 (2020.01); H04N 23/56 (2023.01); H04N 23/743 (2023.01); H04N 23/80 (2023.01)
CPC H04N 23/73 (2023.01) [G01C 3/08 (2013.01); H04N 23/56 (2023.01); H04N 23/743 (2023.01); H04N 23/80 (2023.01); G01S 7/4868 (2013.01); G01S 7/4918 (2013.01); G06T 2207/20021 (2013.01); G06T 2207/20216 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An optical distance measurement system, comprising:
a light source, configured to emit two-dimensional light section at an operating frequency;
an image sensor, configured to
capture, with a first exposure time, a first bright image corresponding to activation of the light source, and
capture, with a second exposure time, a second bright image corresponding to activation of the light source, wherein the second exposure time is longer than the first exposure time; and
a processing unit, configured to
output at least one object distance according to at least one of the first bright image and the second bright image,
wherein the second exposure time is adjustable corresponding to different second bright images,
the image sensor is further configured to capture, with the first exposure time, a first dark image corresponding to deactivation of the light source, and
the processing unit is further configured to adjust the first exposure time according to a first average brightness value of the first dark image.