Method and measuring assembly for determining the wheel or axle geometry of a vehicle
First Claim
1. A method for determining at least one of (a) a wheel and (b) an axle geometry of a vehicle, comprising:
- illuminating a wheel region with structured and with unstructured light during a motion of at least one of (a) at least one wheel and (b) the vehicle;
acquiring multiple images of the wheel region during the illumination, in order to create a three-dimensional surface model having surface parameters, a texture model having texture parameters, and a motion model having motion parameters of the sensed wheel region;
calculating values for the surface parameters, the texture parameters, and the motion parameters using a variation computation as a function of the acquired images, in order to minimize a deviation of the three-dimensional surface model, texture model, and motion model from image data of the acquired images; and
determining at least one of (a) a rotation axis and (b) a rotation center of the wheel as a function of the calculated values of the motion parameters, wherein the variation computation includes;
minimizing a sum of a first, second, and third term, the first term encompassing a degree of deviation between acquired grayscale image data and a projection of texture parameters subjected to the motion model and mapped onto the three-dimensional surface model, the second term encompassing a degree of deviation between three-dimensional point clouds determined from the acquired images and three-dimensional surface parameters subjected to the motion model, and the third term encompassing a norm of the motion model that depends on a geometric transformation by the motion parameters and the kinematic parameters.
3 Assignments
0 Petitions
Accused Products
Abstract
In a method for determining a wheel or axle geometry of a vehicle, the following steps are provided: illuminating a wheel region with structured and with unstructured light during a motion of at least one wheel and/or of the vehicle; acquiring multiple images of the wheel region during the illumination, in order to create a three-dimensional surface model having surface parameters, a texture model having texture parameters, and a motion model having motion parameters of the sensed wheel region; calculating values for the surface parameters, the texture parameters, and the motion parameters using a variation computation as a function of the acquired images, in order to minimize a deviation of the three-dimensional surface model, texture model, and motion model from image data of the acquired images; and determining a rotation axis and/or a rotation center of the wheel as a function of the calculated values of the motion parameters.
-
Citations
13 Claims
-
1. A method for determining at least one of (a) a wheel and (b) an axle geometry of a vehicle, comprising:
-
illuminating a wheel region with structured and with unstructured light during a motion of at least one of (a) at least one wheel and (b) the vehicle; acquiring multiple images of the wheel region during the illumination, in order to create a three-dimensional surface model having surface parameters, a texture model having texture parameters, and a motion model having motion parameters of the sensed wheel region; calculating values for the surface parameters, the texture parameters, and the motion parameters using a variation computation as a function of the acquired images, in order to minimize a deviation of the three-dimensional surface model, texture model, and motion model from image data of the acquired images; and determining at least one of (a) a rotation axis and (b) a rotation center of the wheel as a function of the calculated values of the motion parameters, wherein the variation computation includes;
minimizing a sum of a first, second, and third term, the first term encompassing a degree of deviation between acquired grayscale image data and a projection of texture parameters subjected to the motion model and mapped onto the three-dimensional surface model, the second term encompassing a degree of deviation between three-dimensional point clouds determined from the acquired images and three-dimensional surface parameters subjected to the motion model, and the third term encompassing a norm of the motion model that depends on a geometric transformation by the motion parameters and the kinematic parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification