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:
Jan. 23, 2006
Filed:
Jan. 23, 1991
Jean M. Riseman, Cambridge, MA (US);
John J. Smith, Cambridge, MA (US);
Alice M. D'entremont, Boston, MA (US);
Craig E. Goldman, Natick, MA (US);
Jean M. Riseman, Cambridge, MA (US);
John J. Smith, Cambridge, MA (US);
Alice M. d'Entremont, Boston, MA (US);
Craig E. Goldman, Natick, MA (US);
Canon Inc., Tokyo, JP;
Abstract
An apparatus for generating a high quality image from a digital video signal includes a system for gamma correcting the digital video signal with a digital look up table and for converting the resultant digital signal to an analog video signal. Another circuit generates a triangular wave reference pattern signal and a comparator compares the analog video signal with the triangular wave reference pattern signal to form a pulse-width-modulated signal. A raster scanning print engine producing, for example, a laser beam, scans over a recording medium in accordance with the pulse-width-modulated signal, thereby forming an image of high quality on the recording medium of a print engine. This apparatus can also be used with an analog video signal by first converting the analog video signal to a digital video signal with an analog to digital converter.