1. A 3D camera in accordance with the stereoscopic principle for detecting depth maps of a monitored zone which has at least two camera modules each having an image sensor in mutually offset perspectives for taking two-dimensional starting images as well as a stereoscopic unit which is configured for the application of a stereoscopic algorithm for generating a depth map, in that mutually associated part zones are recognized in two two-dimensional images within a disparity zone taken from offset perspectives and their distance is calculated with reference to the disparity, further comprising a pixel binning unit to generate a two-dimensional intermediate image of lower resolution by binning a respective plurality of pixels from a two-dimensional image; further comprising a fusion unit which fuses at least two depth maps to form a common depth map, with at least one of the depth maps being generated from intermediate images.