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:
Jun. 12, 2001
Filed:
Sep. 08, 1998
Kamalesh U. Patel, Portland, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
An in-service, realtime picture quality analysis method determines the degradation of a test video signal at a test point with respect to a reference video signal by generating from the reference video signal a set of parameters that characterize the images represented by the reference video signal. The set of parameters are inserted into a transport stream that also has an encoded version of the reference video signal. At the test point the set of parameters is extracted from the transport stream, and the test video signal is decoded from the transport stream. A corresponding set of parameters is generated for the test video signal, and the two sets of parameters are compared by a picture quality analysis algorithm to produce a picture quality rating that represents the degradation of the test video signal.