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. 18, 1997
Filed:
Dec. 02, 1994
Yasuo Yagi, Tokyo, JP;
Pioneer Electronic Corporation, Saitama, JP;
Abstract
A line contour enhancing circuit comprises a second order differentiation circuit for effecting a second order differentiation to a video signal and producing a second order differentiation signal, an adding circuit for adding the video signal and the second order differentiation signal, and a non-linear amplifier having a gain characteristic in which a differentiation gain increases gradually as the level of its input signal increases. The circuit features that the second order differentiation circuit receives the video signal output from the non-linear amplifier, thereby the line contour enhancing operation is effected depending on the level of the video signal. With this arrangement the degradation of the image produced by a low luminance level video signal due to the presence of noises is prevented.