Patent ID: 11953310
Assignee: EINES SYSTEMS, S.L.U.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC B  G  H | IPC G  H

Claim 2:
3. The method for measuring the gap and flush of vehicle parts by means of a measuring tunnel according to claim 1, wherein the step of calibrating the video cameras additionally comprises the following sub-steps for calculating the extrinsic parameters:
situating a calibration chessboard inside the measuring tunnel in a position where it is visible by at least one video camera;
taking a measurement of a calibration chessboard by means of a total station, by:
measuring four fixed points on the measuring tunnel structure by means of the total station;
iteratively stationing the total station obtaining a common reference system -SCE- with respect to a vehicle conveyor that conveys vehicles through the inside of the inspection tunnel;
using the total station in the common reference system -SCE- to measure at least twelve auxiliary points located on the calibration chessboard;

calculating the relationship between the common reference system -SCE- and the calibration chessboard using estimation and transformation of rigid bodies;
saving at least one image of the calibration chessboard by each video camera;
calculating a local coordinates system of each video camera and calculating the transformation of the local coordinates system to the common reference system -SCE-.