Inventor
OKUBO HIROMI
JP18 patents
Patents
18 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
US5647010AJul 8, 1997
Image forming apparatus with security feature which prevents copying of specific types of documents
RICOH KK126 citations96
US5392137AFeb 21, 1995
Image processing apparatus in which filtering is selected for input image characteristics
RICOH KK89 citations96
US6987886B1Jan 17, 2006
Image processing based on degree of white-background likeliness
RICOH KK28 citations92
US6556707B1Apr 29, 2003
Method and apparatus for image processing for performing a color conversion
RICOH KK54 citations92
US6041139AMar 21, 2000
Image processing apparatus
RICOH KK42 citations92
US5781653AJul 14, 1998
Image processing apparatus for determining copying-inhibited document
RICOH KK47 citations92
US5410619AApr 25, 1995
Digital image processing apparatus for processing a variety of types of input image data
RICOH KK48 citations92
US4979129ADec 18, 1990
Digital color converting apparatus for color image processor
RICOH KK26 citations92
US7088472B1Aug 8, 2006
Method, system, and apparatus for image forming and processing capable of appropriately adjusting input and output properties
RICOH KK24 citations90
US6731817B2May 4, 2004
Apparatus and method for forming an image by processing input image data while suppressing banding and dropout
RICOH KK18 citations84
US6122406ASep 19, 2000
Image processing device
RICOH KK16 citations84
US7221799B2May 22, 2007
Image processing based on degree of white-background likeliness
RICOH KK7 citations74
US5473444ADec 5, 1995
Image processing device having function of detecting dotted-image area
RICOH KK17 citations74
US7221466B2May 22, 2007
Image processing device, image processing method and image forming apparatus
RICOH KK5 citations62