The invention relates to a method for recording the position, location ormovement of a body part of a patient and a device for recording the positon,location or movement of a body part or a medical instrument. According to theinvention, a graphic marker is connected with the body part or the instrumentand an image of the body part comprising the graphic marker is generated by animage recording camera (5, 6, 7). The image is processed by a processor device(14) as an image file. The invention is characterized in that at least onegeometric size characteristic of the graphic marker is known, wherein theprocessor device (14) determines the positon, location and/or movement of thegraphic marker in the three-dimensional space and in a quantitative mannerrelative to the image recording camera (5, 6, 7) by means of the known sizecharacteristic. The invention offers, without the need of manual calibrationof the measuring system, a substantial automatization and a high measuringprecision during the determination of position and movemnet in the three-dimensional space. Simultaneously, the expenditure on equipment can be reducedand the reaction to the object or body part to be measured or to the patientcan be minimized.
