Patent ID: 7715610
Filing Date: 2010-05-11
Classification: G07D

Abstract:
1. A method of testing a currency item in a currency testing apparatus comprising: deriving a plurality of measurements of the currency item at a resolution (R) defined relative to the spacing of a plurality of sensing elements; processing the plurality of measurements to derive values in at least two different resolutions wherein the resolution (R) is increased in the spatial domain using an interpolation method, increased resolution values in the spatial domain being used to recognize the currency item, and wherein the resolution (R) is reduced in the spectral domain, reduction of the resolution in the spectral domain comprising filtering a signal of the measurements in the spectral domain to reduce the resolution (R) in the spectral domain by taking a subset of the signal's spectral components; and deriving a feature vector using the subset of spectral components, the feature vector being used to denominate the currency item, wherein the method is performed by the currency testing apparatus.