Method and apparatus for registration mark identification
US5018213A · kind A · utility
55Cited by
6References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1988 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | May 11, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F33/0081
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Apparatus and method particularly suitable for use with the close loop color to color registration system of a commercial web printing apparatus utilizes a CCD camera for identifying registration marks. The registration mark composed of a pattern of dot pairs is acquired by the camera and each dot pair of the mark is identified by scoring various attributes of possible dot pairs including color, size and position. This results in highly stable and reliable acquisition of a registration mark on a printed web which may then be processed by an automated registration control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.