Image processing apparatus having a smoothing function which references a bi-level pixel pattern on a main scan line when a predetermined area has a specific bi-level pixel pattern
US5790711A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Dec 10, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4092
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus capable of normally carrying out correct and moreover highly precise smoothing while preventing the complication of the smoothing process and which is able to reliably carry out the smoothing process even when the line density of the image data is multiplied by a predetermined factor. When the black-white pattern of pixel data in a predetermined area is a specific pattern, the judging and line density conversion circuit determines whether a predetermined pixel data is black or white by referring to the black-white pattern of pixel data existing in the main scanning direction of the pixel data as well as the black-white pattern of pixel data existing in a predetermined area. As the line density of the image data can be simultaneously multiplied by a predetermined factor, more precise smoothing is possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.