Image analysis – Image compression or coding – Quantization
Patent
1996-06-19
1998-05-19
Couso, Jose L.
Image analysis
Image compression or coding
Quantization
382237, 382299, 358429, 358445, 358447, 358457, G06K 936
Patent
active
057547068
ABSTRACT:
A system and method for processing image data converts a pixel of image data having a first resolution to a plurality of subpixels, the plurality of subpixels representing a second resolution, the second resolution being higher than the first resolution. The plurality of subpixels are thresholded to generate a group of subpixel values for each pixel and a threshold error value. It is then determined if the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel. If the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel, the group of subpixel vales is modified to produce a pattern without an isolated subpixel. The modification process produces a subpixel error value which is diffused in the slowscan direction to adjacent pixels.
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Metcalfe David J.
Schweid Stuart A.
Bella Matthew C.
Couso Jose L.
Nickerson Michael J.
Xerox Corporation
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