Document with indexes and associated document reader system

An optical reader system capable of 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 the area, the indexes and the pixels having different optical reflection features, the indexes being mixed with the plural pixels for 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 special 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 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.