Image processing apparatus with high- and low-resolution image sensors and an edge detector
US4782399A · kind A · utility
59Cited by
6References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1985 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | Jun 18, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40062
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus has image input systems for inputting image data at high and low resolutions, a high pass filter for filtering the low-resolution image data, an image property discrimination processor for discriminating an edge in the high-pass filtered low-resolution image data, and a signal selection circuit for selecting the image of high or low resolution in accordance with the discrimination result of the discrimination processor. The apparatus processes image signals so as to reproduce optimum quality images for all types of original images including character and halftone images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.