Patent Document ID: 10089753
Application ID: 15641491
Patent Status: 1

Claim One:
1. A method for calibrating a camera by using a multi-pattern calibration rig including a plurality of patterns, each pattern being repetitive and comprising a plurality of calibration shapes, the method comprising: capturing an image of the multi-pattern calibration rig with the camera, segmenting contours of the plurality of calibration shapes, calculating areas of the contours, building respective groups of at least two coherent contours based on a similarity of an area of each contour in each respective group to the area of one or more other contours in the respective group and a distance of each contour in each respective group from the one or more other contours in the respective group, and identifying a position of each pattern in the image based on the respective groups of coherent contours, wherein the similarity is determined by: comparing the area of one contour in the respective group to the area of another contour in the respective group, and determining the two compared areas are similar if a smaller one of the two areas is larger than a predetermined fraction of the other area.