APPARATUS AND METHOD OF SENSING RADIATION DERIVED FROM DIFFERENT PORTIONS OF INFORMATION BEARING MEDIA

摘要

Apparatus is disclosed for classifying originals (or information bearing media) to be printed or reproduced. The apparatus includes an assembly having a first radiation sensitive device for sensing the background or peripheral portion of the original, and a second radiation sensitive device responsive to the discrete sub-portions of the central or subject portion of the original to provide a plurality of corresponding signals, and a circuit for selecting one of the plurality of signals having a predetermined relationship to the other of the signals derived from the second radiation sensitive device.