Picture frame detecting and stopping method

摘要

In a photographic printer in which an original film is conveyed and mounted on a film carrier and a light from a light source and passing the film carrier is received to a two-dimensional image sensor, picture information regarding divided picture elements are detected through the whole area of the original film and a distance to be moved of the original film is obtained in accordance with the size information of the orginal film. The respective picture frames of the original film are detected by receiving a transmitted or reflected light from the original film on the film carrier using the two-dimensional image sensor and the original film is then conveyed by the distance obtained in the previous step so as to thereby position and stop the picture frames on the film carrier. In addition, the picture frames can be automatically conveyed and the exposure amount calculated and corrected in accordance with the picture information regarding the divided picture elements.