Reversible transform for lossy and lossless 2-d data compression
CA 2526762 C · Owner: Srinivasan, Sridhar · Inventors: Srinivasan, Sridhar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A 2D transform and its inverse have an implementation as a sequence of lifting steps arranged for reduced computational complexity (i.e. reducing a number of non-trivial operations). This transform pair has energy compaction properties similar to the discrete cosine transform (DCT) and is also lossless and scale-free. As compared to a separable DCT transform implemented as 1D DCT transforms applied separably to rows and columns of a 2D data block the transforms operations are re-arranged into a cascade of elementary transforms including the 2x2 Hadamard transform, and 2×2 transforms incorporating lifting rotations. These elementary transforms have implementations as a sequence of lifting …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
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- Filed November 10, 2005 and granted May 21, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2025.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.