A multi-spectral imager and the applications of same for the marking and coding of, for example, textiles, linens, garments, documents and packages for high-speed machine identification and sortation. Specific uses include garment and textile rental operations, laundry operations, and the postal and...http://www.google.com/patents/US6578712?utm_source=gb-gplus-sharePatent US6578712 - Methods and apparatus employing multi-spectral imaging for the remote identification and sorting of objects
