| 摘要 |
The present invention provides a method for determining the physical fitness of documents such as bank notes. The method comprises passing a document past an image sensor while sequentially illuminating the document using multi-mode illumination, wherein a predetermined mode of illumination is used for each line scanned by the image sensor, producing an interleaved image of the document. A multi-dimensional transformation function is applied to this interleaved image to produce a composite measurement, which is then projected onto an empirically determined fitness vector to yield a scalar fitness value for the document. This value is compared against empirically prescribed fitness values to determine if the document is fit enough to remain in circulation or should be taken out of circulation and retired (destroyed). |
