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:
Dec. 19, 2017
Filed:
Apr. 02, 2008
Gang Ji, Bothell, WA (US);
Yongjun Wu, Redmond, WA (US);
Florin Folta, Redmond, WA (US);
Naveen Thumpudi, Sammamish, WA (US);
Gang Ji, Bothell, WA (US);
Yongjun Wu, Redmond, WA (US);
Florin Folta, Redmond, WA (US);
Naveen Thumpudi, Sammamish, WA (US);
Microsoft Technology Licensing, LLC, Redmond, WA (US);
Abstract
A decoder which can detect errors in MPEG-2 coefficient blocks can identify syntactically-correct blocks which have out-of-bounds coefficients. The decoder computes coefficient bounds based on quantization scalers and quantization matrices and compares these to coefficient blocks during decoding; if a block has out-of-bounds coefficients, concealment is performed on the block. In a decoder implemented all in software, coefficient bounds checking is performed on iDCT coefficients against upper and lower bounds in a spatial domain. In a decoder which performs iDCT in hardware, DCT coefficients are compared to an upper energy bound.