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This contribution deals with the calibration of active stereoscopic systems consisting of a camera and a structured light projector. Usually, expensive equipments like precise calibration pieces or dedicated positioning devices are used for the projector calibration. We developed a flexible calibration method using only a planar target as calibration board without other equipment. The method requires only two image acquisitions from which the projector parameters are estimated using an optimization method. A quantitative evaluation demonstrates the accuracy and flexibility of the proposed calibration method.