Image signal processing apparatus
US4870500A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1986 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Sep 25, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/38
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image signal processing apparatus includes a contact type line image sensor as an image reading unit, an original table, an image processing circuit, a trimming circuit, and an original recognition circuit including D flip-flops and white detection circuits. The contact type line image sensor reads an image signal including original and nonoriginal area images. The white detection circuits in the original recognition circuit detect the original area for each line or every plurality of lines on the bases of the image signal input at the image sensor. The D flip-flops in the original recognition circuit delay the image signal input at the image sensor. The trimming circuit extracts an image signal corresponding to the original area from an image signal delayed by the flip-flops, on the basis of a detection result of the white detection circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.