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:
Apr. 30, 1991
Filed:
Jun. 23, 1989
Daniel L Schuster, Portland, OR (US);
Magni Systems, Inc., Beaverton, OR (US);
Abstract
A color enhancement circuit according to the present invention extracts 'sine-squared' (haversine) pulses representing absolute values for the derivatives of R-Y and B-Y color difference 'sine-squared' transitions; multiples by offset, sign-inverted luminance, and adds the luminance-weighted 'singe-squared' pulses to the composite video as color enhancement signals which exceed the NTSC-legal chroma bandwidth but are within the NTSC-legal luminance bandwidth. The pulses augment luminance during chroma transitions, restoring luminance contributions from chrominance which are lost when chroma subcarrier packet risetimes and bandwidth are limited by NTSC broadcast requirements.