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System and method for performing wavelet and inverse wavelet transformations of digital data using semi-orthogonal wavelets

  • US 6,275,619 B1
  • Filed: 06/15/2000
  • Issued: 08/14/2001
  • Est. Priority Date: 08/29/1997
  • Status: Expired due to Term
First Claim
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1. A decomposition filter stage for decomposing a set of input coefficients into a first set of output coefficients and a second set of output coefficients by applying a first sequence of decomposition coefficients and a second sequence of decomposition coefficients to the set of input coefficients, the decomposition filter stage comprising:

  • a deinterleaver that deinterleaves the set of input coefficients into a first subset of the set of input coefficients and a second subset of the set of input coefficients;

    a first filter that applies a first subsequence of the first sequence of coefficients to the first subset of the set of input coefficients to generate a first set of intermediate coefficients;

    a second filter that applies a first subsequence of the second sequence of coefficients to the second subset of the set of input coefficients to generate a second set of intermediate coefficients;

    a first summer that sums the first and second sets of intermediate coefficients to generate the first set of output coefficients;

    a third filter that applies a second subsequence of the first sequence of coefficients to the first subset of the set of input coefficients to generate a third set of intermediate coefficients;

    a fourth filter that applies a second subsequence of the second sequence of coefficients to the second subset of the set of input coefficients to generate a fourth set of intermediate coefficients; and

    a second summer that sums the third and fourth sets of intermediate coefficients to generate the second set of output coefficients.

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