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US Patent 7689052 Multimedia signal processing using fixed-point approximations of linear transforms

Patent 7689052 was granted and assigned to Microsoft on March, 2010 by the United States Patent and Trademark Office.

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Patent
Patent
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Patent attributes

Current Assignee
Microsoft
Microsoft
1
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
76890521
Patent Inventor Names
Jian Lou1
Gary J. Sullivan1
Date of Patent
March 30, 2010
1
Patent Application Number
114233871
Date Filed
June 9, 2006
1
Patent Primary Examiner
‌
Sherali Ishrat
1
Patent abstract

Close approximations of ideal linear transforms, such as the forward and inverse discrete cosine transformation (DCT), are formed with minimum complexity using fixed-point arithmetic. The transformation is decomposed into a smaller set of transformations (e.g., the LLM decomposition of the DCT). The multiplication factors of the decomposition are then approximated by a fixed-point representation. However, instead of simply applying scaling and rounding operations to produce fixed-point approximations closest to the multiplication factors themselves, fixed-point multiplication factors are chosen that have the effect (after the cascaded operations of the various stages of decomposition) of being the closest feasible approximations of the entries in the resulting complete ideal transformation matrix.

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