Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-04-05
1996-10-08
Vu, Kim
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358465, 382254, 382266, 382269, H04N 140, G06K 940
Patent
active
055637213
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 address 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. To derive the output tiles stored in the look-up table, a high resolution bit map is created from an input tile by scaling the input tile. A triangular portion of each convex corner in the high resolution bit map is chopped off, and a triangular portion of each concave corner in the high resolution bit map is filled in. The resulting pattern is then smoothed using a low pass filter. The size of these triangular portions and the extent of low pass filtering are determined using a function based on the vulnerability of a pixel to being eliminated during the above smoothing process. This regulation of smoothing helps preserve desired detail in the image. The middle portion of the high resolution bit map corresponding to the two original target pixels intended to be corrected is then divided up into a number of pixel areas, where each area represents a pixel to be printed. A threshold number is then compared to the pixels in each area, and a corresponding output pixel is then stored, printed, or otherwise displayed.
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IBM Technical Disclosure Bulletin, vol. 25, No. 10, Mar. 1983.
Hewlett--Packard Company
Nguyen Madeleine Anh-Vinh
Vu Kim
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