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:
Mar. 08, 2005
Filed:
Nov. 19, 2001
Kouji Minami, Tokyo, JP;
Kouji Minami, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In an edge correcting circuit of an image to be represented by a digitized image signal, a high-frequency signal extracting circuit () extracts a high-frequency signal of the image by calculation based on a signal of a target pixel, a signal of a pixel shifted from the target pixel by m (m being an integer not smaller than 2) pixels in the right or lower direction, and a signal of a pixel shifted from the target pixel by m pixels in the left or upper direction, an amplitude-restricting signal generator () determines an amplitude-restricting signal (Si) based on a minimum value or a maximum value of an absolute value of a difference between the signal of the target pixel and a signal of a pixel shifted from the target pixel by n (n being an integer not smaller than 1 and smaller than m) pixels in the right or lower direction, and an absolute value of a difference between the signal of the target pixel and a signal of a pixel shifted from the target pixel by n pixels in the left or upper direction, an amplitude restricting circuit () restricts the output of the high-frequency extracting circuit () to the output of the amplitude-restricting signal generator (), and an adder () adds the output (Si) of the amplitude restricting circuit () or a signal obtained therefrom, as an edge correction signal (Sj, Sq), to the signal (Sc) of the target pixel. It is possible to obtain an edge-corrected image signal with the horizontal or vertical overshoots having been reduced or removed.