| 摘要 |
<p>A method of and apparatus for determining the genuineness of a document (22) such as a currency note printed at least in part with magnetizable ink in which there is produced a first signal (Msat) as a measure of the saturation magnetization of a portion of the document printed with the ink and a second signal (Mrem) as a measure of the remanent magnetization of said portion and in which the ratio of the second signal (Mrem) to the first signal (Msat) is determined as a measure of genuineness of the document.</p> |
