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:
Sep. 08, 1992
Filed:
Jul. 13, 1989
Christopher M Engel, Arlington Heights, IL (US);
Khosro M Rabii, Arlington Heights, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A luminance signal transient improver and non-linear peaking arrangement processes a digital luminance signal by generating a first difference signal and a second difference signal and developing therefrom a threshold control signal, a high frequency peaking signal and a low frequency peaking signal. The high frequency peaking signal consists of the second difference signal as modified by a high pass filter and the threshold control signal consists of the second difference signal as modified by a threshold circuit. The first difference signal is passed through an absolute value circuit and a low frequency emphasis circuit and modified by the threshold control signal and added to the high frequency peaking signal. The combined result is subjected to non-linear filtering and added to the luminance signal to form a horizontally processed luminance signal. A comb filter develops a vertical detail component representing differences between successive lines of luminance and combines the vertical detail component with the luminance signal to form a vertically processed luminance signal which is combined with the horizontally processed luminance signal to develop a fully processed luminance signal.