Image processing method and system
US5784488A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1994 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Dec 27, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing system and method for converting an input image having continuous tone regions and binary regions into a binary output image includes a block evaluation system that generates a plurality of characteristic values for each block of the input image, and determines a block attributes for each block based on the plurality of characteristic values. The image processing system and method converts the input image into the binary output image on a block-by-block basis using one of a binary region conversion process or a continuous tone region conversion process, wherein the conversion process for each block is selected based on the determined block attribute. In addition, the image processing system and method corrects the determined block attribute based on the block attributes of each block and other blocks surrounding each block. Further, the image processing system and method detects when state transitions between block attributes of adjacent blocks occur, such that the conversion process selection is further controlled by the detected state transitions, based on either the block attributes for each block and other blocks surrounding each block, or the distribution o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.