Abstract: An image that includes editing comments is generated on a medical display unit which is arranged in a sterile working area of a medical facility. An input device for generating input data representing the editing comments is also arranged in the sterile working area. First, the display unit displays a primary image, such as an endoscopic photograph from inside of a patient's body. A physician can generate the input data using the input device. Both the primary image and the input data are transmitted to an image processing unit arranged outside the sterile area. The image processing unit combines the input data and the primary image to form a secondary image including the editing comments. The secondary image is subsequently retransmitted to the display unit.