METHOD FOR DETERMINING THE RELATIVE POSITION OF AN OBJECT IN AN AREA, AND OPTICAL INPUT SYSTEM

摘要

The invention relates to a method for determining the relative position of an object in an area in six spatial degrees of freedom. A marker pattern with at least three markers is applied on the object, and an optical detecting device is provided with a two-dimensional sensor surface. The object is moved in the detection region of the optical detecting device such that the marker pattern can be detected by the detecting device, images of the markers are projected onto image positions on the sensor surface, and the image coordinates of said markers are ascertained. An analyzing method is used to determine the relative position of the marker pattern by analyzing the image coordinates. The analyzing method is characterized, inter alia, in that the position of an invariant point (B) is ascertained on a reference circle (K) on a reference plane (E), the position of said invariant point (B) describing a unique relationship between a coordinate system assigned to the marker pattern and a coordinate system assigned to the detecting device.