Mason, Fenwick & Lawrence
Graphic output device including antialiasing capability governed by decisions regarding slope of edge data
 A graphic output device for removing the aliases of the edges of a vector image by an antialiasing procedure and effectively outputting image data undergone such processing. Whether or not the inclination of an input vector is greater than 45 degrees is determined. In the event of outputting the result of antialiasing processing, a pulse width modulation system (vertically long dot diameter) is selected if the inclination of the vector is greater than 45 degrees, or a power modulation system (horizontally long dot diameter) is selected if it is smaller than 45 degrees. 
Ricoh Company, Ltd.
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inventional inventional inventional
Akira Naomi Hitomi Masaki Yoshiaki Kan
Ohori Inoue Kumazaki Sano Hanyu Tomita