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. 31, 1995
Filed:
Feb. 03, 1994
Toshihiro Gai, Nagaokakyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A filter for separating brightness signal and color signal from a composite color signal of NTSC type or type, includes a horizontal color signal extracting filter, a vertical color signal extracting filter, a horizontal/vertical color signal extracting filter, a switching circuit, and an image correlation judging circuit. The image correlation judging circuit makes the switching circuit select: the color signal extracted by the horizontal color signal extracting filter when the horizontal correlation is judged to be stronger than the sampling value at the target sampling point; the color signal extracted by the vertical color signal extracting filter when the vertical correlation is judged to be stronger than the same; and the color signal extracted by the horizontal/vertical color signal extracting filter when neither of them is judged to be stronger than the same. The result is that mutual leakage of the brightness signal and the color signal at the area of intensive change into the another's channel can be reduced, thereby avoiding dot jamming and deterioration of image quality. The image correlation judging circuit judges the strength of correlation based on the non-correlative energy.