Method for reducing a binary image
US4656664A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1984 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Oct 24, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/4023
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The method of the present invention reduces a binary digital image in size by a factor F by a method including the steps of: storing the image in bit sequence; removing one or more rows of bits along the vertical axis of the image to convert i rows of bits to j rows of bits where 0.5i.ltoreq.j<i; modifying a line adjacent to each line discarded to preserve selected information from the discarded line; repeating the steps of removing and modifying a predetermined number of times to achieve a reduction by a factor F1 along the vertical axis; rotating the image in a first direction by ninety degrees; removing one or more rows of bits along the original horizontal axis of the image to convert i rows of bits to j rows of bits where 0.5i.ltoreq.j<i; modifying a line adjacent to each line discarded to preserve selected information from the discarded line; repeating the steps of removing and modifying a predetermined number of times to achieve a reduction by a factor F2 along the original horizontal axis; rotating the image back to its original orientation; storing the reduced size image generated by the above steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.