Method and apparatus for efficiently interpolating an image using an expansion factor derived from two different numbers of gray levels
US6213653A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1996 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Feb 9, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/4007
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for determining an efficient expansion factor for an interpolation process to produce an interpolated image that has a greater spatial resolution and greater number of gray levels than an original image. An original image having a resolution is received by a computer system and an expansion factor for the image is determined. The expansion factor is derived from a number of gray levels displayable on a target display device and a number of gray levels that can be represented in an interpolated image produced from the original image. This expansion factor is close to the largest expansion factor that will allow the target display device to display all of the interpolated gray levels, and is used to provide an interpolated image having high visual quality and minimal memory requirements. The original image is interpolated using the expansion factor and is preferably supplied to the target display device, such as a display screen or a printing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.