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. 04, 2014
Filed:
Nov. 30, 2011
Barin Geoffry Haskell, Tinton Falls, NJ (US);
Atul Puri, Riverdale, NY (US);
Robert Lewis Schmidt, Howell, NJ (US);
Barin Geoffry Haskell, Tinton Falls, NJ (US);
Atul Puri, Riverdale, NY (US);
Robert Lewis Schmidt, Howell, NJ (US);
AT&T Intellectual Property II, L.P., Atlanta, GA (US);
Abstract
A quantizer and dequantizer for use in a video coding system that applies non linear, piece-wise linear scaling functions to video information signals based on a value of a variable quantization parameter. The quantizer and dequantizer apply different non linear, piece-wise linear scaling functions to a DC luminance signal, a DC chrominance signal and an AC chrominance signal. A code for reporting updates of the value of the quantization parameter is interpreted to require larger changes when the quantization parameter initially is large and smaller changes when the quantization parameter initially is small.