Patent Document ID: 20100201809
Application ID: 12668915
Patent Status: 0

Claim One:
1. A calibration method for estimating a camera parameter representing a characteristic of each of imaging systems of a distance measuring device, each imaging system including a lens and an imaging area corresponding to the lens, and said calibration method comprising: capturing, using the distance measuring device, an image of a reference chart which (i) represents a geometric pattern in which elements are arranged and (ii) is positioned to have a predetermined positional relationship with the distance measuring device; modifying a luminance distribution affected by aberration of the lens in the captured image of the reference chart captured in said capturing; calculating, as a feature point position, a gravity center position of each element in the captured image whose luminance distribution is modified in said modifying; and estimating the camera parameter using the feature point position calculated in said calculating and an approximate actual gravity center position in the reference chart.