Method, system, and device for automatic determination of nominal backing color and a range thereof
US7508455B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2005 |
| Grant date | Mar 24, 2009 |
| Priority date | — |
| Expiry date | Jan 21, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/75
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method, system, and device for generating a clean clipping signal α for a chromakey function or a video composition, including identifying background colors formed by a solid color background, shadows cast by still and moving subjects, a non-uniform reflection caused by spot lighting and non-flat backdrop or flaw wall, and translucent foreground objects, with a 3D volume in a 3D color space; determining parameters defining same by using a dirty alpha α; generating a clean clipping signal αshd background colors, and a clean clipping signal αtsl for translucency colors; identifying foreground colors formed by the still and moving subjects with a 3D volume in a 3D color space; classifying colors into transition colors; and generating an area map for mapping each pixel into background, shadow, translucent, foreground, and transition areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.