Method for coding two dimensional optical identification with the same gray level and printing product thereof
US7770805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2008 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Feb 14, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06037
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for coding a two dimensional (2D) optical identification (OID) with the same gray level and a printing product thereof. The printing product includes a 2D-OID, which includes a positioning block and a plurality of data coding blocks. The positioning block has a plurality of specific patterns arranged as an N×M matrix, wherein the specific patterns along a first edge thereof and the specific patterns along a second edge thereof are filled. The data coding blocks are disposed around the positioning block and include the specific patterns arranged as the N×M matrix, wherein the specific pattern in a center of the data coding blocks is filled. A specific number of the remaining specific patterns in each data coding block are filled to serve as a code for representation of data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.