Abstract: An arrangement for checking or examining bank-notes or similar documents include a detector, such as a CCD array of, for example, 256 photocell devices. The documents are scanned by the photocell devices transversely of their longitudinal extent. The signals are digitized by an analogue/digital converter (2), such that the output of each photocell device is represented only by one digital bit. The analogue/digital converter (2) further defines horizontal and vertical edges of the documents and of printed images thereon, and passes the digitized signals including that of the defined edges to a position detector (6) and to a memory (4). The position detector (6) delimits the signals digitized by the analog/digital converter (2) and filtered by a filter (3) by admitting into the memory (4) for storage sixty four picture elements of selected document information with respect to vertical and horizontal outer edges as a window of 64 by 64 picture elements.

Abstract: An arrangement for detecting bank notes having magnetic properties, comprising transport means (11) for transporting documents past a magnetic detector (12-14). The object of the invention is to increase the possibility and the reliability of distinguishing bank notes which are not genuine from genuine bank notes and bank notes of a given denomination/kind from bank notes of another denomination/kind.The detector includes a permanent magnet (12) and a magnetic circuit (13) having detector means (14) for detecting changes in the magnetic field through the magnetic circuit (13). The output side of the detecting means (14) is connected to a signal processing means (20) for generating signals in response to the magnetic properties of bank notes transported through the arrangement.The magnetic circuit (13) includes an air gap (131) which is located closely adjacent the bank note transport path (0--0).