Video frames that contain text areas are selected from given video frames by removing redundant frames and non-text frames, the text areas in the selected frames are located by removing false strokes, and text lines in the text areas are extracted and binarized. As such, after displaying on a screen a table of the various types of information being stored in the apparatus, if a thumbnail image is chosen and the delete key is selected, then only the image corresponding to the chosen thumbnail image is deleted from the memory, as well as from the table. The axially tilted, cooled spectral filter deflects the radiation emitted by the uncooled camera away from being reflected back into the camera. The clamp is removed and air is flushed or removed from the outflow graft and the blood pump.