Method and apparatus for decoding bar code symbols using byte-based searching
US5404003A · kind A · utility
33Cited by
13References
40Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1994 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Jul 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A bar code reader locates and decodes a bar code symbol in a pixel image by searching along a selected scan line for a candidate quiet zone and then counting the bright/dark transitions that correspond to candidate bars and spaces. The reader determines whether the candidate quiet zone and candidate bars and spaces correspond to a bar code symbol, and, if so, decodes the symbol. When processing binary pixel images, the reader searches for candidate quiet zones and counts bright/dark transitions by analyzing the image one byte of pixels at a time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.