Method for detecting facial expressions of a portrait photo by an image capturing electronic device
US7715598B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2006 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Mar 10, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method for detecting facial expressions of a portrait photo by an image capturing electronic device, a face captured in the portrait photo is detected. The position and range of the opened and closed facial features are detected, and the facial features within an identified range are magnified according to a specific proportion. A patch of facial features and their surroundings within a specific range is cut according to the magnified identified range, so that the patch can show a change of facial expressions and a specific range of their surroundings. A facial feature classifier is trained by a specific number of opened and closed facial feature samples based on the Adaboost algorithm and used for detecting the facial features in the patch to determine whether the facial feature is situated at an opened state or a closed state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.