Inventor
SAKANO YUKIO
JP27 patents
Patents
27 patentsUS5751854AMay 12, 1998
Original-discrimination system for discriminating special document, and image forming apparatus, image processing apparatus and duplicator using the original-discrimination system
RICOH KK181 citations98
US6272248B1Aug 7, 2001
Original-discrimination system for discriminating special document, and image forming apparatus, image processing apparatus and duplicator using the original-discrimination system
RICOH KK113 citations97
US5659628AAug 19, 1997
Special-document discriminating apparatus and managing system for image forming apparatus having a special-document discriminating function
RICOH KK93 citations96
US5652803AJul 29, 1997
Special-document discriminating apparatus and managing system for image forming apparatus having a special-document discriminating function
RICOH KK56 citations96
US5444543AAug 22, 1995
Method and apparatus for detecting a closed-loop area of an image
RICOH KK63 citations96
US5339171AAug 16, 1994
Image processing apparatus especially suitable for producing smooth-edged output multi-level tone data having fewer levels than input multi-level tone data
RICOH KK60 citations96
US5798844AAug 25, 1998
Duplicator having function concerning specific mark put on recording sheet and image forming apparatus having function of processing confidential documents
RICOH KK73 citations93
US5444518AAug 22, 1995
Image forming apparatus which adds identification information to recorded images to prevent forgery
RICOH KK47 citations92
US5144338ASep 1, 1992
Image recorder using pulse width modulation
RICOH KK23 citations92
US4760464AJul 26, 1988
Shading correction system for image scanning apparatus
RICOH KK53 citations92
US4707745ANov 17, 1987
Digital copier with document image region decision device
RICOH KK46 citations92
US5801844ASep 1, 1998
Image processing apparatus
RICOH KK23 citations89
US5771104AJun 23, 1998
Image processing apparatus having function of magnification changing image data
RICOH KK8 citations74
US5579417ANov 26, 1996
Image processing apparatus
RICOH KK7 citations74
US5473444ADec 5, 1995
Image processing device having function of detecting dotted-image area
RICOH KK17 citations74
US5337162AAug 9, 1994
Image processing apparatus for preventing occurrence of moire in output image
RICOH KK15 citations74
US5144456ASep 1, 1992
Image processing apparatus and method
RICOH KK14 citations74
US4984283AJan 8, 1991
Two dimensional half-tone dot discrimination device
RICOH KK11 citations74
US4908716AMar 13, 1990
Image processing apparatus
RICOH KK19 citations74
US4875190AOct 17, 1989
Two-dimensional memory unit having a 2d array of individually addressable blocks each having a 2d array of cells
RICOH KK16 citations74
US4615018ASep 30, 1986
Method for writing data into a memory
RICOH KK10 citations74
US4479119AOct 23, 1984
CRT Display device
RICOH KK15 citations74
US5283664AFeb 1, 1994
Apparatus for converting and processing input bi-level image data and faithfully rendering tones, colors, and edges
RICOH KK18 citations73
US5764812AJun 9, 1998
Image processing apparatus for providing an isolated-dot removing function
RICOH KK6 citations63
US4851920AJul 25, 1989
Digital copying apparatus
RICOH KK2 citations63
US4805120AFeb 14, 1989
Two-color image recorder
RICOH KK3 citations63
US4227644AOct 14, 1980
Document feed apparatus
RICOH KK5 citations63