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:
Aug. 21, 2001
Filed:
Feb. 23, 2000
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention suppresses overshoot and undershoot at an edge of a video signal. For this purpose, an edge emphasis device which includes a first delay unit for delaying an input signal (s,) a predetermined time, a second delay unit for further delaying an output signal (s,) from the first delay unit a predetermined time, and a second derivative signal generation unit for outputting a second derivative signal (s,) of the input signal on the basis of the input signal (s,) and the output signals (s,,s,) from the first and second delay units, has an edge-emphasizing signal generation unit (,) for generating an edge-emphasizing signal (s,) by assigning the sign (s,) of the second derivative signal to the minimum absolute value of the difference (s,) between the input signal and the output signal from the first delay unit, the difference (s,) between the output signals from the first and second delay units, and the second derivative signal (s,), and a delay addition unit (,) for outputting a signal obtained by emphasizing an edge of the input signal by adding the edge-emphasizing signal and input signal by matching their delay times.