Image processing apparatus
US4672461A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1984 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Nov 30, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/38
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus comprising a detector for reading out image information on an original placed on an original glass plate and detecting an area of the original, and a microcomputer for detecting a concentration level regarding the main-scan line of the image information in the original area read out by the detector and operating a threshold value for a binary coding process regarding the main-scan line of the image information on the basis of the concentration level. By changing the threshold level, the background noise eliminating process can be performed even if the background level varies. Thus, even if an original is unevenly placed on the original glass plate, the background noise eliminating process can be executed in the whole area of the original image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.