gnu.javax.imageio.jpeg
Class DCT
Discrete Cosine Transformations.
double[][] | c- Cosine matrix
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double[][] | cT- Transformed cosine matrix
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DCT()- The basic constructor.
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static double | C(int u)- Figure A.3.3 IDCT, Cu Cv on A-5 of the ISO DIS 10918-1.
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float[][] | fast_fdct(float[][] input)
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double[][] | fast_idct(double[][] input)- fast_idct - Figure A.3.3 IDCT (informative) on A-5 of the ISO DIS
10918-1.
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double[][] | idj_fast_fdct(input[][] )
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static float[][] | slow_fdct(float[][] value)
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static double[][] | slow_idct(double[][] matrix)- slow_idct - Figure A.3.3 IDCT (informative) on A-5 of the ISO DIS
10918-1.
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clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
c
public double[][] c
Cosine matrix
cT
public double[][] cT
Transformed cosine matrix
DCT
public DCT()
The basic constructor. Object is special, because it has no
superclass, so there is no call to super().
C
public static double C(int u)
Figure A.3.3 IDCT, Cu Cv on A-5 of the ISO DIS 10918-1. Requirements and
Guidelines.
fast_fdct
public float[][] fast_fdct(float[][] input)
fast_idct
public double[][] fast_idct(double[][] input)
fast_idct - Figure A.3.3 IDCT (informative) on A-5 of the ISO DIS
10918-1. Requires and Guidelines. This is a fast IDCT, it much more
effecient and only inaccurate at about 1/1000th of a percent of values
analyzed. Cannot be static because initMatrix must run before any
fast_idct values can be computed.
slow_fdct
public static float[][] slow_fdct(float[][] value)
slow_idct
public static double[][] slow_idct(double[][] matrix)
slow_idct - Figure A.3.3 IDCT (informative) on A-5 of the ISO DIS
10918-1. Requirements and Guidelines. This is a slow IDCT, there are
better algorithms to use, it's fairly expensive with processor speed.
DCT.java --
Copyright (C) 2005 Free Software Foundation, Inc.
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