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:
Dec. 10, 2002
Filed:
May. 28, 1999
Tian-Quey Lee, Hsinchu, TW;
Mustek Systems Inc., Hsinchu, TW;
Abstract
A digital keystone modulation circuit for transforming a digital image to a digital projection image is disclosed. The digital image and the digital projection image have n horizontal image signals and n horizontal projection image signal respectively. The digital keystone modulation circuit includes an output controller for outputting a (3k−1) image signal and one of a (3k−2) and (3k) image signal in response to an output image selected signal, an output image selector for outputting a first counting signal and the output image selected signal in response to a localization sync-signal, a first counting controller for counting in response to the counting signal, a k horizontal projection image frequency, and a dot number of one of the (3k−2) and (3k−1) image signal, a second counting controller for counting in response to the output image selected signal, the k horizontal projection signal, and a dot number of the (3k−1) image signal, and a projection image frequency generator for outputting the k projection image frequency in response to a horizontal sync-signal and a sum of the dot numbers of the (3k−2) , (3k−1) , and (3k−1) image signals.