Device and method for determining a key for clipping a subject moving against a colored background
US5903318A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1996 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Nov 25, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/75
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for determining a key KD for clipping a subject moving against a colored background, the said key making it possible to separate the color space into three regions, a first region defining a volume representing the colored background, a second region defining a volume representing the subject and a third region defining a transition region between the colored background and the subject, where the device and method defines the volume representing the colored background in the form of a cone of aperture angle .alpha. whose axis of symmetry (W) passes through the achromic and zero-luminance point of the color space and a point representing the color of the colored background. The invention also relates to any type of electronic apparatus implementing the abovementioned device and method, such as video mixers or autonomous devices for clipping and overlaying video images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.