Color barcodes for mobile applications: a per channel framework
US9111186B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2012 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Oct 10, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2019/06225
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A new framework for extending monochrome barcodes to color which offers higher data rates is described. In one embodiment of the present invention, the framework encodes independent data in each of the cyan, magenta, and yellow print colorant channels commonly used in color printing and decodes the data from each of the complementary red, green, and blue channels in capture color channels. The framework effectively increases the capacity of monochrome barcodes by a factor of three. In another embodiment of the present invention, a physical model based approach mitigates the effect of cross-channel interference among the print-colorant channels and capture color channels. In another embodiment of the invention, a pilot block methodology is used to estimate the model parameters and enable cross-channel interference cancellation. In another embodiment of the invention, an expectation maximization (EM)-type methodology estimates the model parameters and enables cross-channel interference cancellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.