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Encoding video data using reversible integer approximations of orthonormal transforms

  • US 9,665,541 B2
  • Filed: 04/25/2014
  • Issued: 05/30/2017
  • Est. Priority Date: 04/25/2013
  • Status: Active Grant
First Claim
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1. A method for lossless encoding of data, comprising:

  • receiving the data; and

    applying a reversible transform approximation having orthonormally scaled outputs to the received data, wherein the reversible transform approximation comprises, the data comprising at least one of image data and video data;

    a first operation that receives the data as inputs and scales outputs asymmetrically;

    a second operation that receives outputs from the first operation as inputs, and cancels the asymmetric scaling; and

    a third operation that applies a rotation to outputs received from the second operation as inputs, wherein outputs of the third operation are orthonormally scaled compared to the inputs of the first operation.

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