Contextual abnormality CAPTCHAs
US8495518B2 · kind B2 · utility
13Cited by
2References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2009 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Sep 14, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/36
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method, computing device, and computer program product are provided for automatically generating contextual image tests implemented on a computer. An image is received by a computer. Sections of the image are altered to appear out of context or wrong to human users. The user must then identify the errors to pass the CAPTCHA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.