Vehicle Service System Optical Target Assembly Calibration

A method for determining a measurement relating to a vehicle wheel assembly comprising the steps of:

• associating an optical target with the vehicle wheel assembly, wherein the optical target has at least two surfaces, each with a plurality of target elements arranged thereon;
• establishing a geometric and spatial configuration of the target elements relative to each other;
• detecting, from at least one two-dimensional image of the optical target acquired by at least one imaging sensor, at least one target element from a first of said at least two surfaces, and at least one target element from a second of said at least two surfaces;
• and
• determining the measurements relating to the vehicle wheel assembly based on said two-dimensional image of the target and the established geometric and spatial configuration of the target elements on the surfaces.

A machine vision optical target for attachment to a vehicle wheel assembly, having at least two target elements, with at least one target element disposed on a first target surface, and at least one target element disposed on a second target surface, produced by a method including:

• providing a target structure, said target structure positioning said first target surface and said second target surface in a stable spatial relationship;
• disposing at least a first target element on said first target surface;
• disposing at least a second target element on said second target surface without consideration as to a geometric and spatial relationship with said first target element;
• and
• determining said geometric and spatial relationship between said first target surface and said second target surface utilizing said first and second target elements, said determined relationship subsequently associated with said machine vision optical target.