The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 1999
Filed:
Feb. 29, 1996
Applicant:
Inventor:
Masaaki Okada, Toda, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358461 ; 358448 ;
Abstract
A document serving as a white reference (a reference white background) is read to create shading data, the shading data are stored, the checksum of these shading data is obtained and this value also is stored. The checksum of the stored shading data is obtained before the document is read, and this obtained value of the checksum is compared with the already stored value of the checksum of the shading data. If the values of both checksums are found to coincide as a result of the comparison, image processing using the stored shading data is executed. If the values of both checksums do not coincide, however, image processing using shading data having a fixed value is executed.