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:
Jul. 08, 2003
Filed:
Feb. 22, 2000
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention can suppress overshoot/undershoot, and can maintain the improvement effect of the leading edge of an edge portion. For this purpose, a second derivative signal generator ( ) generates a second derivative signal (s ) on the basis of time-serially input three successive pixels. A second derivative signal suppression unit ( ) generates a signal (s ) obtained by suppressing the second derivative signal, and a signal (s ) indicating the sign of the second derivative signal. The absolute values of the differences between the pixel of interest, and its neighboring pixels are computed, and a smaller one of the absolute values is selected as a signal (s ) by a minimum value selection circuit ( ). By multiplying the obtained signals (s , s , s ) by a multiplier ( ), an edge-emphasizing signal (s ) is generated. The edge-emphasizing signal (s ) is added to the signal of the pixel of interest by an adder ( ), thus obtaining an edge-emphasized signal s