Mechanism for producing interpolated color values for a sampled color image signal using a linear equation technique
US5032910A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Oct 2, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/843
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Color fringing of edges between regions of different color in an interpolated image is effectively avoided by a signal processing technique that infers the existence of a color edge in response to prescribed changes in image characteristics at sample points for which data is available, and then interpolates intermediate values that are associated with a color edge using a linear equation. A first signal value, associated with a first band containing information of a first image characteristic (e.g. the green component) is fully sampled at a first spatial frequency, and a second signal value, associated with a second band containing information of a second characteristics (e.g. a red-green differential) is sampled at a second spatial frequency, lower than the first spatial frequency, so that interpolation of the second signal values is required. Differences between first sampled signal values, associated with sampling locations of the second sampled signal values, are measured. If the measured difference for successive fully sampled values is greater than a prescribed threshold value, the process infers the presence of an edge between these sample locations and proceeds to generate …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.