Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1995-06-27
1998-01-27
Metjahic, Safet
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
B41J 247
Patent
active
057126755
ABSTRACT:
A resolution enhancement apparatus and method of a laser printer using a modulated laser beam is adapted to an image forming apparatus of the laser printer. It includes a memory for storing sequentially input image data in a sequential scanning method, rearranging a scanning line order and generating a 5.times.5 sample window. Also included are a first processor for classifying and outputting a pattern of the image data according to bitmap information in a pixel using nine 3.times.3 masks produced from the 5.times.5 sample window supplied from the memory, a second processor for using pixel density to classify data output from the first processor into a plurality of groups and outputting data of the classified groups, and a signal modulator for modulating data output from the second processor into a predetermined pattern and outputting the modulated pattern. This minimizes the use of memory space by using four row line memories and enhancing resolution by expressing finite shapes according to nineteen modulation patterns while eliminating the more severe portions of pixel magnitude variation (step phenomenon).
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Dhong Yong-bae
Jeong Min-su
Kim Soo-won
Bushnell Esq. Robert E.
Kim Chung-duck
Mahoney Christopher E.
Metjahic Safet
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