Abstract: A first and a second image recording unit, which are arranged at a defined distance from one another, are provided for monitoring a spatial region. The spatial region has at least one structure having a plurality of substantially parallel edges. A number of reference marks are arranged at the structure. A first image of the spatial region is recorded by means of the first image recording unit. A second image is recorded by means of the second image recording unit. A number of reference distances between the image recording units and the reference marks are determined. A structure position of the structure is determined on the basis of the reference distances. Moreover, a number of object positions are determined on the basis of the first and second images, wherein each object position represents the spatial distance of an object relative to the image recording units. Depending on the object positions, a switching signal is generated.

Abstract: A first and a second image recording unit, which are arranged at a defined distance from one another, are provided for monitoring a spatial region. The spatial region has at least one structure having a plurality of substantially parallel edges. A number of reference marks are arranged at the structure. A first image of the spatial region is recorded by means of the first image recording unit. A second image is recorded by means of the second image recording unit A number of reference distances between the image recording units and the reference marks are determined. A structure position of the structure is determined on the basis of the reference distances. Moreover, a number of object positions are determined on the basis of the first and second images, wherein each object position represents the spatial distance of an object relative to the image recording units. Depending on the object positions, a switching signal is generated.