Patent
1990-07-02
1992-05-12
Evans, Arthur G.
395141, 395101, G06K 1500
Patent
active
051134861
ABSTRACT:
Boundaries between colored and uncolored image parts are reproduced on a pixel raster by determining a binary value ("colored" or "uncolored"), proceeding along a boundary, for adjoining pixels intersected by said boundary, said value being determined on the basis of the situation of said pixel with respect to the boundary and a carried-forward correction value. On the basis of the situation of said pixel with respect to the boundary a fractional value is calculated which is then rounded off to a binary pixel value. The rounding-off error made in such cases is processed using a prevention function for preventing allocating such binary values to the boundary pixels that visible bulges are formed on the boundary and is then carried-forward to the next pixel and included in the fractional value thereof. Instances of such prevention functions are described. This procedure gives a better reproduction of lines extending obliquely over the pixel raster.
REFERENCES:
patent: 4996653 (1991-02-01), Butler et al.
patent: 5016195 (1991-05-01), Worp
Modified Aloyrithm by Brandon, FBM Tech. Dis. Bulletin, vol. 20 No. 4 Sep. 1977 Digital Formats for Typefaces by Karon.
Evans Arthur G.
Oce'-Nederland, B.V.
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