US 12,142,005 B2
Camera based distance measurements
Igal Raichelgauz, Tel Aviv (IL)
Assigned to AUTOBRAINS TECHNOLOGIES LTD, Tel Aviv (IL)
Filed by AUTOBRAINS TECHNOLOGIES LTD, Tel Aviv (IL)
Filed on Oct. 13, 2021, as Appl. No. 17/500,882.
Claims priority of provisional application 63/091,303, filed on Oct. 13, 2020.
Prior Publication US 2022/0114756 A1, Apr. 14, 2022
Int. Cl. G06T 7/80 (2017.01); G01S 17/931 (2020.01); G06T 7/50 (2017.01); G06T 7/60 (2017.01); G05D 1/00 (2006.01)
CPC G06T 7/80 (2017.01) [G01S 17/931 (2020.01); G06T 7/50 (2017.01); G06T 7/60 (2013.01); G05D 1/0248 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for distance measurement, the method comprises:
obtaining, from a camera of a vehicle, an image of a surroundings of the vehicle;
searching, within the image, for an anchor, wherein the anchor is associated with at least one physical dimension of a known value;
when finding the anchor, determining a distance between the camera and the anchor based on, (a) the at least one physical dimension of a known value, (b) an appearance of the at least one physical dimension of a known value in the image, and (c) a distance-to-appearance relationship that maps appearances to distances, wherein the distance-to-appearance relationship is generated by a calibration process that comprises obtaining one or more calibration images of the anchor, and obtaining one or more distance measurements to the anchor;
wherein the method further comprises executing the calibration process;
wherein the camera is a first camara, the one or more calibration images are multiple calibration images acquired at different distances from a second camera;
wherein the one or more distance measurements are indicative of the different distances; and
wherein the executing of the calibration process comprises calculating the distance-to-appearance relationship based on the appearances of the at least one physical dimension of a known value in the multiple calibration images and the different distances.