| 摘要 |
<p>A document, such as a banknote, may be provided with a security thread having one or more regions of magnetic material and one or more optically visible markings. A security thread reader is provided for detecting the presence of the security thread and the optically visible markings. The security thread reader comprises a magnetic field detector for determining the presence and location of the security thread, a controller for setting a specified target area of the document to include an area of the document in which the security thread is present, an optical scanner for generating an image of the specified target area, and an image processor for identifying the optically visible markings within the scanned image corresponding to the security thread. In this way a document or banknote can be identified and authenticated automatically. <IMAGE></p> |
