Abstract: A method of imaging media, such as banknotes, is provided. A note is moved with respect to a CCD camera and a variable interference filter (VIF), and a succession of images acquired over time. From the plurality of images covering a range of wavelengths of light, profiles may be assembled of the optical characteristics of the banknote. These may then be compared with reference profiles to detect forged, fake, or unacceptable media. The method may also be applied to a range of types of objects. Also provided is an apparatus for implementing the method.

Abstract: The invention relates to a method of and apparatus for optically scanning bank notes, the method including the steps of transmitting the bank notes along a transport path, illuminating each of the bank notes from one side of the transport path and forming a representation of the bank note utilizing a photo-electric means located on the opposite side of the transport path. The invention is characterized by determining the location of any defect in the bank note in relation to the boundaries of the bank note and determining whether or not the bank note is acceptable for use in an automated teller machine (ATM), dependent on the location of any detected defect.

Abstract: In apparatus for detecting counterfeit bank-notes, an electronic camera forms a digital representation of a small area of the bank-note. The digital image is stored in an image memory. The Fourier transform of the digital image is then computed and analyzed to determine if it contains high spatial frequency components, and if so, the note is identified as counterfeit. The analyzer may use pattern recognition techniques. In a modification, Fourier transforms of a plurality of small areas are formed and averaged and the average is analyzed. This invention is particularly suitable for identifying counterfeit bank-notes having regular patterns e.g. of lines or dots, therein, such as are produced by color photocopiers or offset lithography printing.

Abstract: A method for determining motility comprising the detection, by means such as a transducer, of vibration of the external abdominal surface generated by gastrointestinal vibration and analysis of the signals produced by the transducer. Means are provided for integrating the signal over discrete time intervals in order to obtain meaningful results.