US 12,142,006 B2
Distortion calibration method for ultra-wide angle imaging apparatus, system and photographing device including same
Wenxue Li, Wuhan (CN)
Assigned to Black Sesame Technologies Inc.
Filed by Black Sesame Technologies Inc., San Jose, CA (US)
Filed on Jan. 24, 2022, as Appl. No. 17/582,833.
Claims priority of application No. 202110117411.9 (CN), filed on Jan. 28, 2021.
Prior Publication US 2022/0237824 A1, Jul. 28, 2022
Int. Cl. G06T 7/80 (2017.01); G06T 5/80 (2024.01); G06T 7/13 (2017.01); H04N 23/698 (2023.01)
CPC G06T 7/80 (2017.01) [G06T 5/80 (2024.01); G06T 7/13 (2017.01); H04N 23/698 (2023.01); G06T 2207/20164 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for a distortion calibration of ultra-wide angle imaging apparatus, comprising:
acquiring calibration images in sample imaging apparatus respectively, wherein the number of the sample imaging devices is a predetermined number;
measuring corner coordinates using a corner detection algorithm to obtain the predetermined number of sets of corner coordinates for each of the acquired calibration images;
inputting the obtained predetermined number of sets of corner coordinates into a selected calibration algorithm model to obtain a set of internal parameters and distortion parameters; and
performing an iterative optimization through the selected calibration algorithm to obtain desired internal parameters and distortion parameters for images calibration of the ultra-wide-angle imaging apparatus to be calibrated, by:
taking the obtained predetermined number of sets of corner coordinates as an input,
taking the obtained set of internal parameters and distortion parameters as initial values of optimization variables, and
taking an index for evaluating an effect of distortion correction as the minimum.