Package de.gsi.math.spectra.dct

Class FloatDCT_3D

  • public class FloatDCT_3D
extends java.lang.Object
    Computes 3D Discrete Cosine Transform (DCT) of single precision data. The sizes of all three dimensions can be arbitrary numbers. This is a parallel implementation of split-radix and mixed-radix algorithms optimized for SMP systems.

    Part of code is derived from General Purpose FFT Package written by Takuya Ooura (http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html)
    Author:
    Piotr Wendykier (piotr.wendykier@gmail.com)

    • Constructor Summary

      Constructors 
      Constructor Description
      FloatDCT_3D​(int slices, int rows, int columns)
      Creates new instance of FloatDCT_3D.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void forward​(float[][][] a, boolean scale)
      Computes the 3D forward DCT (DCT-II) leaving the result in a .
      void forward​(float[] a, boolean scale)
      Computes the 3D forward DCT (DCT-II) leaving the result in a .
      void inverse​(float[][][] a, boolean scale)
      Computes the 3D inverse DCT (DCT-III) leaving the result in a.
      void inverse​(float[] a, boolean scale)
      Computes the 3D inverse DCT (DCT-III) leaving the result in a.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • FloatDCT_3D

        public FloatDCT_3D​(int slices,
                   int rows,
                   int columns)
        Creates new instance of FloatDCT_3D.
        Parameters:
        slices - number of slices
        rows - number of rows
        columns - number of columns

    • Method Detail

      • forward

        public void forward​(float[] a,
                    boolean scale)
        Computes the 3D forward DCT (DCT-II) leaving the result in a . The data is stored in 1D array addressed in slice-major, then row-major, then column-major, in order of significance, i.e. the element (i,j,k) of 3D array x[slices][rows][columns] is stored in a[i*sliceStride + j*rowStride + k], where sliceStride = rows * columns and rowStride = columns.
        Parameters:
        a - data to transform
        scale - if true then scaling is performed

      • forward

        public void forward​(float[][][] a,
                    boolean scale)
        Computes the 3D forward DCT (DCT-II) leaving the result in a . The data is stored in 3D array
        Parameters:
        a - data to transform
        scale - if true then scaling is performed

      • inverse

        public void inverse​(float[] a,
                    boolean scale)
        Computes the 3D inverse DCT (DCT-III) leaving the result in a. The data is stored in 1D array addressed in slice-major, then row-major, then column-major, in order of significance, i.e. the element (i,j,k) of 3D array x[slices][rows][columns] is stored in a[i*sliceStride + j*rowStride + k], where sliceStride = rows * columns and rowStride = columns.
        Parameters:
        a - data to transform
        scale - if true then scaling is performed

      • inverse

        public void inverse​(float[][][] a,
                    boolean scale)
        Computes the 3D inverse DCT (DCT-III) leaving the result in a. The data is stored in 3D array.
        Parameters:
        a - data to transform
        scale - if true then scaling is performed