Claims1. A method for configuring a monitoring device for monitoring a spatial area, wherein the monitoring device comprises at least one image recording unit adapted to generate a three-dimensional image of the spatial area, the method comprising the steps of:
2. The method of claim 1, wherein a plurality of setup marks are placed in the spatial area prior to the step of recording the true three-dimensional image, and wherein the step of determining a plurality of spatial points comprises an identification of said setup marks within the true three-dimensional image. 3. The method of claim 2, wherein the setup marks are automatically identified in the three-dimensional image and marked with a symbol which is graphically superimposed onto the three-dimensional image displayed. 4. The method of claim 2, wherein the setup marks are removed after the configuration and before the monitoring device is taken into operation. 5. The method of claim 1, wherein at least three spatial points which are not located on a common straight line are determined for defining the configuration plane. 6. The method of claim 5, wherein the configuration plane is defined by means of the at least three spatial points, and wherein a fourth spatial point is determined which is outside of the configuration plane, said fourth spatial point being used in order to define an origin of a coordinate system. 7. The method of claim 1, wherein the configuration plane is graphically superimposed onto the displayed three-dimensional image. 8. The method of claim 1, wherein the variable geometry element is graphically superimposed onto the displayed three-dimensional image. 9. The method of claim 1, wherein the geometry element is exclusively generated with side faces which are perpendicular to the configuration plane. 10. The method of claim 1, wherein a plurality of geometry elements are generated and combined with one another. 11. The method of claim 1, wherein a plurality of reference marks are placed in the spatial area and are recorded together with the three-dimensional image, and wherein a reference position for each reference mark is determined and stored in the data record. 12. The method of claim 1, wherein the monitoring device comprises at least a first and a second image recording unit which are arranged spatially offset with respect to one another and generate a first and a partially offset second image of the spatial area, the first and second images having a common image area, and wherein the common image area is displayed as a part of the three-dimensional image. 13. The method of claim 12, wherein the first and second images are subjected to a stereo analysis in order to determine range information relating to objects within the spatial area, and wherein said range information forms a part of the true three-dimensional image. 14. The method of claim 1, wherein the data record defines a section of the spatial area which corresponds to the geometry element, wherein an object is introduced into the section of the spatial area, wherein a live image of the object is recorded during said introduction into the section, and wherein said live image is archived. 15. The method of claim 1, wherein a cyclic redundancy checksum is generated for the data record and transferred to the monitoring device, and wherein the monitoring device accepts or rejects the data record as a function of said cyclic redundancy checksum. 16. The method of claim 1, wherein the true three-dimensional image of the spatial area is stored in the configuration device for defining the configuration plane and generating the data record. 17. The method of claim 1, wherein the true three-dimensional image of the spatial area is a live image during the steps of defining the configuration plane and generating the geometry elements. 18. A system for monitoring a spatial area, comprising at least one image recording unit for generating a true three-dimensional image of the spatial area, comprising an evaluating unit for triggering a control function in dependence on the three-dimensional image, and comprising a configuration device for configuring the evaluating unit, the configuration device comprising:
19. A data storage medium comprising program code which is designed to be executed on a computer in order to carry out a method of configuring a monitoring device for monitoring a spatial area, wherein the monitoring device has at least one image recording unit for generating a three-dimensional image of the spatial area, and wherein the method comprises the steps of:
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