Two-dimensional optical identification device with same gray level
US8678296B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2011 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Dec 7, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06037
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
On a two-dimensional optical identification device with same gray level, a plurality of two-dimensional optical identification codes are arranged, each having a plurality of data blocks and an outer positioning block. Each data block has a plurality of defined patterns, and each defined pattern is located in one of virtual areas produced by equally dividing the data block. The outer positioning block has a plurality of first positioning points and a first direction identification point, and is placed at two adjacent boundaries of the plurality of data blocks for defining the positions of the plurality of data blocks. A fixed position data block is selected as a data block coding indication block for indicating the coding of the other data blocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.