Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1994-03-11
1996-01-09
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358447, 358462, H04N 138
Patent
active
054833558
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 notch or tick in a line of pixels. These exceptions are then corrected accordingly.
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IBM Technical Disclosure Bulletin, vol. 25, No. 10, Mar. 1983.
Coles Sr. Edward L.
Hewlett-Packard Co.
Lee Fan
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