| US 7,487,916 B2 | ||
| Imaging-based bar code reader with enhanced decoding capability | ||
| Joseph Cai, Rocky Point, N.Y. (US); and Xiaomei Wang, Port Jefferson Station, N.Y. (US) | ||
| Assigned to Symbol Technologies, Inc., Holtsville, N.Y. (US) | ||
| Filed on Sep. 15, 2005, as Appl. No. 11/228,210. | ||
| Prior Publication US 2007/0057066 A1, Mar. 15, 2007 | ||
| Int. Cl. G06K 7/10 (2006.01) | ||
| U.S. Cl. 235—462.15 [235/462.41] | 27 Claims |
| 1. An imaging based bar code reader including an imaging and decoding system for imaging and decoding a target bar code comprising:
an imaging system including an imaging pixel array and a memory for:
imaging the target bar code by scanning the target bar code to generate a tilted imaged bar code stored in memory, the tilted
imaged bar code comprising an array of gray scale values stored in the memory;
generating a virtual scan line traversing a horizontal width of the tilted imaged bar code;
establishing a zone about the virtual scan line, the zone defined by an upper bound on one side of the virtual scan line and
a lower bound on opposite side of the virtual scan line;
projecting gray scale values within the zone onto the virtual scan line thereby generating a sequence of gray scale values
associated with the virtual scan line, the sequence of gray scale values representative of a pattern of elements of the target
bar code; and
decoding the target bar code utilizing the sequence of values associated with the virtual scan line.
|