US 12,307,719 B2
Calibration scale, calibration method and apparatus, and detection method and apparatus
Guan Chen, Ningde (CN); Fei Chen, Ningde (CN); and Guannan Jiang, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Aug. 2, 2023, as Appl. No. 18/229,309.
Application 18/229,309 is a continuation of application No. PCT/CN2023/082890, filed on Mar. 21, 2023.
Claims priority of application No. 202210989282.7 (CN), filed on Aug. 17, 2022.
Prior Publication US 2024/0062423 A1, Feb. 22, 2024
Int. Cl. G06T 7/80 (2017.01); G03B 35/04 (2021.01); G03B 37/00 (2021.01); G06T 3/40 (2024.01); G06T 3/4038 (2024.01); G06T 5/50 (2006.01); H04N 13/246 (2018.01); H01M 4/04 (2006.01)
CPC G06T 7/85 (2017.01) [G03B 35/04 (2013.01); G03B 37/00 (2013.01); G06T 3/40 (2013.01); G06T 3/4038 (2013.01); G06T 5/50 (2013.01); H04N 13/246 (2018.05); G06T 2207/10012 (2013.01); G06T 2207/20221 (2013.01); H01M 4/0404 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A camera calibration method for image splicing, comprising
providing a calibration scale comprising a scale body and a calibration pattern arranged on the scale body, wherein:
the calibration pattern comprises at least two calibration pattern subsets arranged along a first direction of the scale body, and the at least two calibration pattern subsets comprise a plurality of first calibration blocks arranged at spacings along the first direction and staggered along a second direction of the scale body;
for each calibration pattern subset, projections of the plurality of first calibration blocks along the first direction have a first overlapping area, and a length of the first overlapping area along the second direction is less than or equal to a first preset threshold; and
projections of at least two first overlapping areas along the first direction have a second overlapping area;
arranging the calibration scale on a surface of a target object; and
for each of at least two cameras, determining a scan path of the camera based on at least one calibration pattern subset on the calibration scale, comprising:
adjusting a location of the camera to scan the calibration pattern subset;
adjusting a scan trajectory of the camera so that the camera sequentially scans all the first calibration blocks in the calibration pattern subset; and
determining, as the scan path, a scan trajectory obtained when projections of both a scan trajectory of the camera and a scan trajectory of an adjacent camera along the first direction completely fall within a second overlapping area.