Background noise removing apparatus and method applicable to color image processing apparatus
US5689590A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1995 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | May 19, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A density converting unit converts densities concerning respective color components in color-image data for each pixel so as to change the densities concerning respective color components for the pixel into lower densities when the densities concerning respective color components for the pixel are determined to be white or approximately white. The density converting unit converts the densities concerning color components in the color-image data for each pixel so as to change the densities concerning respective color components for the pixel into densities corresponding to white ones when all of the densities concerning respective color components for the pixel are lower than a predetermined threshold density value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.