Adaptive scaling for decoding spatially periodic self-clocking glyph shape codes
Convolution filtering for decoding self-clocking glyph shape codes
Methods and means for reducing bit error rates in reading self-clocking glyph codes
Self-clocking glyph code for encoding dual bit digital values robustly Patent #: 5245165
ApplicationNo. 172512 filed on 12/22/1993
US Classes:235/494, Particular code pattern235/456Multiple column code
ExaminersPrimary: Hajec, Donald T.
Assistant: Le, Thien M.
International ClassesG06K 007/10
AbstractAn optically readable record for storing encoded information comprises (1) a recording medium, (2) a self-clocking data code for encoding the information, with this data code being composed of glyphs that are written in a two dimensional code field on the recording medium on centers that are spatially distributed in nominal accordance with a predetermined spatial formatting rule, where the glyphs are defined by respective symbols that are selected from a finite set of optically discriminable symbols to encode the information, and (3) at least one additional glyph pattern that is written on said recording medium in nominal accordance with the spatial formatting rule, the additional code pattern providing physical addressing information for random access from any given location within the glyph pattern to any other given location within the same glyph pattern or another glyph pattern on the same or a differnt recording medium.