The device, method and computer program for superimposing a intraoperative live image of a surgical field or of the operating field with a preoperative image of the operating area

Means (100) for superimposing an intraoperative first live image (112) of an operational area (105) with a preoperative second image (114) of the operating field (105), or for superposition of the operating field (105) with the preoperative second image (114) of the operating field ( 105), having the following features: means (110) for receiving and providing the first image (112); means (120) for providing the second image (114); means (130) for defining characteristic points (131-1; ...; 136-1) in the first image (112) and for defining (for the characteristic points 131-1; ....; 136- 1) corresponding points (131-2; ...; 136-2) in the second image (114), so that the characteristic points (131-1; ...; 136-1) and the corresponding points (131 ...;; 136-2) mark in the first (112) and second (114) image corresponding to one another positions of the operating field (105), wherein the means (130) for defining the characteristic points (131-1 -2;. ..; 136-1) and said corresponding thereto Punke (131-2; ...; ...