Image reproduction involving enlargement or reduction of extracted contour vector data for binary regions in images having both binary and halftone regions
US5644366A · kind A · utility
22Cited by
19References
98Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1993 |
| Grant date | Jul 1, 1997 |
| Priority date | — |
| Expiry date | Jan 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When an image is input, that input image is separated into a halftone region, such as a photograph, and a binary region, such as a character/line. Contour vector data along an edge of the separated binary image region is extracted. Regarding the binary image region, when the input image is to be enlarged or reduced and then output, individual coordinates in the extracted contour vector data are enlarged or reduced to reproduce the binary image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.