Patent
1992-10-22
1996-06-11
Nguyen, Phu K.
E06F 1568
Patent
active
055264743
ABSTRACT:
An area ratio calculation device calculates an area ratio of a pixel constituting an image corresponding to supplied image data if the area ratio corresponding to the supplied image data has not yet been stored in an area ratio storing device, the area ratio corresponding to an area occupied by the image corresponding to the supplied image data. The area ratio is stored in an area ratio storing device. An image drawing device draws an image corresponding to supplied image data by providing a pixel darkness value corresponding to the area ratio of a pixel constituting the image corresponding to the supplied image data, the area ratio being obtained by reference to the area ratio storing device if the area ratio of a pixel constituting an image identical to the image corresponding to the supplied image data has already been stored in the area ratio storing device, or the area ratio being obtained as a result of calculation by means of the area ratio calculation device if the area ratio of a pixel constituting an image identical to the image corresponding to the supplied image data has not been stored in the area ratio storing device.
REFERENCES:
patent: 5123085 (1992-06-01), Wells et al.
patent: 5220650 (1993-06-01), Barkans
patent: 5237650 (1993-08-01), Priem et al.
Nguyen Phu K.
Ricoh & Company, Ltd.
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