Method for recognizing markers using dynamic threshold and learning system based on augmented reality using marker recognition
US8682095B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2009 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Jan 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for recognizing markers printed on a learning material, includes sampling an image of the learning material; grouping the sampled image of pixels into a first image group and a second image group based on a threshold; and calculating medians of the first image group and the second image group to update the threshold with a first average value of the calculated medians. Further, the method for recognizing markers printed on the learning material includes repeating the above until a difference between a previous threshold and an updated threshold is equal to or smaller than a reference value; binarizing an image captured by a camera based on the updated threshold; and detecting the markers based on the binary image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.