Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
December 30, 2008
Patent Application Number
10620744
Date Filed
July 15, 2003
Patent Primary Examiner
Patent abstract
An improved spatial-domain lapped transform (SDLT) in a digital media codec uses mismatched relaxed pre-processing filter and aggressive post-processing filter to minimize range expansion while increasing the smoothing effect to reduce blocking artifacts of block transform-based coding. The improved SDLT can further include a range-limiting or clipping operation to limit the range expansion from the pre-processing filter. Additionally, the SDLT can selectively switch pairs of pre- and post-processing filters based on a quality metric.
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