A system for verifying an object of interest, includes a grayscale one-dimensional bar pattern coupled to the object, an illumination and imaging system using a one-dimensional imaging device for reading the pattern coupled to the object and for producing a pattern image, a device for translating the...http://www.google.com.au/patents/US5619026?utm_source=gb-gplus-sharePatent US5619026 - Grayscale barcode reading apparatus system including translating device for translating a pattern image into a sequence of bar widths and transition directions
