Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1995-04-17
1997-07-22
Wong, Peter S.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358455, 382216, 382254, H04N 140, G06K 962, G06K 940
Patent
active
056508581
ABSTRACT:
Method and system for increasing the effective resolution at which a lower resolution input pixel image is printed on a higher resolution dot matrix printer such an ink-jet or laser printer are described. Illustratively, a 300-dpi by 300-dpi input pixel image is prepared at the printer for printing at 600-dpi by 600-dpi, with otherwise jagged edges appropriately smoothed to produce high print quality. Each pixel and its predefined neighboring pixels in the input image are compared to stored image templates and when a match is found, the corresponding quad pixel, or super-pixel, to be output is altered from a mere replication of the input pixel, thereby to eliminate jagged edges. Memory space in the printer is reduced by storing templates that represent only a fraction of the problem patterns, the input pixel image being reoriented between comparisons in order to account for all possible cases. If it is determined that there are gray-scaled pixels within the neighborhood surrounding and including a given pixel of the input pixel image, the corresponding super-pixel produced at the output for printing preserves the gray-scale of the original.
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Frahm Eric
Hewlett--Packard Company
Wong Peter S.
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