Patent ID: 7909254
Filing Date: 2011-03-22
Classification: G06K

Abstract:
1. An optical reader system for reading a document with indexes, the document being constructed by printing plural pixels and divided into plural areas, each area having plural indexes to represent an area code corresponding to an area, the indexes and the pixels having different optical reflection features, both the indexes and the plural pixels being printed on the document, each of the indexes having plural indexing dots in an isotropic arrangement, the indexing dots having a center dot for positioning the indexes, the indexes using a material readable by the optical reader system in printing, the system comprising: a filter, which allows a light with specific wavelengths to pass through, so as to obtain a desired light corresponding to the indexes of the document; a sensor, which is connected to the filter for sensing the light passed through the filter and, accordingly, forming a pattern to output; and a decoder, which is connected to the sensor for decoding and thus obtaining corresponding indexes in accordance with the pattern outputted by the sensor; wherein the pixels are YMCK (yellow, magenta, cyan, black) pixels of a 1-bit halftone image for being printed on the document and the indexes are printed on the document by overlapping K pixels, or the pixels are YMC pixels of a 1-bit halftone image for being printed on the document and the indexes are printed on the document as K pixels.