Pixel correctional and smoothing method
US5483355A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1994 |
| Grant date | Jan 9, 1996 |
| Priority date | — |
| Expiry date | Mar 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/409
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved method for providing a more faithful and pleasing rendition of a pixel pattern is described herein. This method first places the original pixel pattern in a bit mapped memory. A small portion of this bit mapped pattern, called an input tile, acts as an index for a look-up table containing a corrected pixel pattern portion (an output tile) corresponding to the target pixels to be corrected in the input tile. The corresponding output tile is then printed or otherwise displayed at a higher dots-per-inch (dpi), in both the horizontal and vertical directions, than the original pixel pattern to provide a corrected and higher resolution pattern. This process may also be performed using an algorithm which performs a correction on the target pixels in the input tile to generate an output tile instead of indexing a corresponding output tile in a look-up table. If the original pixel pattern is detected to be part of an image, as opposed to text, no correction of the pixel data is made. The preferred method also detects input tile exceptions which are not subject to the normal corrections performed on the other input tiles. Such an exception may be the detection of a stray dot or a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.