Apparatus and method for forming a composite image pixel through pixel blending
US5444835A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Sep 2, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for combining a foreground pixel signal and a background pixel signal according to a blending factor signal to generate a composite pixel signal comprises first, second, and third registers; a signal selecting multiplier; and at least one adder. The first, second, and third registers store the foreground pixel signal, the background pixel signal, and the blending factor signal, respectively. The signal selecting multiplier uses the signal within the third register to selectively shift and add the signals within the first and second registers, resulting in a compound pixel signal. Each adder is used to combine the compound pixel signal with a correction signal, producing an approximation signal. A subset of bits within the approximation signal correspond to the composite pixel signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.