Method for measuring the mudguard edge of a vehicle on a test bench

A method for measuring the wing edge (7) of a vehicle (8) on a test bed,

• wherein the test bed has a coordinate system,
• wherein in the coordinate system, the Z-axis is the vertical axis on the test bed and
• the X-axis is an axis on the test bed extending in the horizontal plane in the longitudinal direction of a vehicle (8) located on the test bed for testing, and
• the Y-axis is an axis extending perpendicular to the X-axis and perpendicular to the Z-axis,
• wherein the method comprises the following steps:
• projecting a uniform light pattern (4) onto a vehicle (8) using at least one illumination unit (3), wherein the light pattern (4) can be divided into sub-regions of equal size such that the sub-regions of the light pattern (4) are individualised,
• recording the light pattern (4) projected onto the vehicle (8) by two imaging units (2a, 2b), wherein the two imaging units (2a, 2b) each record the light pattern (4) projected momentarily onto the vehicle (8),
• moving the light pattern (4) projected onto the vehicle (8) by stimulating vibration of the illumination unit (3) or at any rate at least of one component of the illumination unit (3),
• stereophotogrammetrically determining a 3D point cloud from the recordings by the two imaging units (2a, 2b) of the light pattern (4) projected onto the vehicle (8) during vibration of the illumination unit (3) or of the at any rate at least one component of the illumination unit (3),
• identifying a subset of points from the 3D point cloud (9), wherein the subset is formed by the intersection
• of points of the point cloud (9)
• with a plurality of volumes (10),
• wherein each volume (10) is delimited by two planes, which extend both in the direction of the Y-axis and in the direction of the Z-axis,
• wherein these two planes have a spacing Δx from one another in the direction of the X-axis,
• wherein a plurality of these volumes (10) is located at adjacent positions xn on the X-axis,
• determining the position and orientation of the wing edge (7) as a result data set based on the subset of the points of the 3D point cloud.