Image data converting method and image processing apparatus
US5796931A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1994 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Jun 6, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/52
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image data converting method permits performing an appropriate image process in the following manner. Data of each picture element of an n-state (n bits per pixel) image is multiplied by a constant in order to m-state-code the data (where m>n). A correction value, obtained from, for example, the average density of surrounding picture elements by .gamma. correction, masking or the like, is determined and added to a value corresponding to the m-state-coded data. Further, an image processing apparatus of the present invention multi-state-codes binary color image information the quantity of which is proportional to a plurality of colors and which has been input, before image-processing the multi-state-coded color image information in order to make the information binary by a conversion-to-binary method of a density preservation type, and the image processing apparatus outputs the information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.