Method and apparatus for detecting a closed-loop area of an image
US5444543A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | May 26, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A closed-loop area detecting method includes the steps of: reading a dot matrix from bi-level image data, the dot matrix comprising a target dot and two or more contiguous dots contiguous to the target dot; performing a first pattern matching to detect whether a dot matrix coincides with one of a plurality of first patterns so as to set a first flag for each dot; performing a second pattern matching to detect whether a dot matrix coincides with one of a plurality of second patterns so as to set a second flag for each dot; repeating the above mentioned first and second flag setting so that the second flags for all the dots of the image data are set; and detecting a dot of the image data as lying in the inside of a closed-loop area when the second flag is set to a first value, and detecting a dot of the image data as lying on the outside of the closed-loop area when the second flag is set to a second value. An image processing apparatus utilizing the closed-loop area detecting method is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.