Method for compositing a source and destination image using a mask image
US5379129A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1992 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | May 8, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/3872
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention provides a method for compositing a source image and a destination image using a mask image to produce a result image in a digital image processing system. The method is, on a pixel-by-pixel basis, using the mask image to select between the source and destination images: where a black color value for a mask pixel selects the color value of the corresponding pixel of the source image; and a white color value for a mask pixel selects the color value of the corresponding pixel of the destination image; and where an intermediate color value for a mask pixel selects a weighted average between source and destination pixel color values. The calculations of the weighted average color value are done in color space, such as on a color component by color component basis. The result image can be displayed or stored for further use. This method can be described in boolean expression according to the formula: EQU result=((1-mask)*source)+(mask*destination).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.