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:
Nov. 20, 2012
Filed:
Dec. 11, 2007
Sadao Fujita, Tokyo, JP;
Sadao Fujita, Tokyo, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
An image processor capable of detecting whether an image formed on a recording medium by the image forming apparatus is defective or non-defective with as high accuracy as possible and at high speed. A sheet-surface portion-determining section determines sheet-surface portions of a non-defective formed image on a pixel basis, and stores data of the sheet-surface portion/non-sheet-surface portion distribution, and extracts smallest RGB pixel values from image data of a group of pixels determined to correspond to a sheet-surface portion, to form RGB offset signals based on the smallest values. A sheet-surface portion determination-based offset section subtracts the values of the offset signals from the image data (RGB) of an inspection object. An image quality-determining section determines whether a formed image on the object is defective or non-defective on a pixel basis, using the most significant 1-bit RGB values subjected to the subtraction and the distribution data.