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:
Feb. 17, 1998
Filed:
Dec. 16, 1994
Hideyuki Nagata, Tokyo, JP;
Shigeo Yamagata, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an image forming apparatus for forming a binarized image upon adding on additional information without degrading image quality, a mode signal assumes an 'H' or 'L' level. When the mode signal is at the 'H' level, a pattern in which a binarized output attains the 'H' level for two successive pixels appears in a low-density area of the image formed, thereby indicating the start of data representing additional information. When the mode signal is at the 'L' level, additional information is represented by the level of a control signal f. The binarized output is controlled in such a manner that the spacing of black pixels becomes an odd number of pixels in a low-density area of the formed image in a case where the control signal f is at the 'L' level and an even-number of pixels in the low-density area of the formed image in a case where the control signal f is at the 'H' level. In other words, the additional information is expressed by indicating '0' when the spacing of black pixels is an odd number and '1' when the spacing of black pixels is an even number.