Package boofcv.factory.transform.wavelet

Class FactoryWaveletDaub

java.lang.Object
boofcv.factory.transform.wavelet.FactoryWaveletDaub
public class FactoryWaveletDaub extends Object

Creates different variety of Daubechie (Daub) wavelets. For Daub-J and Daub J/K wavelets the index number refers to the number of coefficients. These wavelets are often used in image compression.

Citations:
James S. Walker, "A Primer on WAVELETS and Their Scientific Applications," 2nd Ed. 2008

  • Constructor Details

    • FactoryWaveletDaub

      public FactoryWaveletDaub()

  • Method Details

    • daubJ_F32

      public static WaveletDescription<WlCoef_F32> daubJ_F32(int J)

      DaubJ wavelets have the following properties:

      • Conserve the signal's energy
      • If the signal is approximately polynomial of degree J/2-1 or less within the support then fluctuations are approximately zero.
      • The sum of the scaling numbers is sqrt(2)
      • The sum of the wavelet numbers is 0

      Parameters:
      J - The wavelet's degree.
      Returns:
      Description of the DaubJ wavelet.

    • biorthogonal_F32

      public static WaveletDescription<WlCoef_F32> biorthogonal_F32(int J, BorderType borderType)

      Daub J/K biorthogonal wavelets have the following properties:

      • DO NOT conserve the signal's energy
      • If the signal is approximately polynomial of degree (J-1)/2-1 within the support then fluctuations are approximately zero.
      • The sum of the scaling numbers is 1
      • The sum of the wavelet numbers is 0

      Parameters:
      J - The wavelet's degree. K = J-2.
      borderType - How image borders are handled.
      Returns:
      Description of the Daub J/K wavelet.

    • biorthogonal_I32

      public static WaveletDescription<WlCoef_I32> biorthogonal_I32(int J, BorderType borderType)
      Integer version of biorthogonal_F32(int, boofcv.struct.border.BorderType).
      Parameters:
      J - The wavelet's degree. K = J-2.
      borderType - How image borders are handled.
      Returns:
      Description of the Daub J/K wavelet.

    • convertToInt

      public static WlBorderCoefFixed<WlCoef_I32> convertToInt(WlBorderCoefFixed<WlCoef_F32> orig, WlCoef_I32 inner)