DCT

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com.obrador
Class DCT

java.lang.Object
  com.obrador.DCT

class DCT
extends java.lang.Object

Field Summary

java.lang.Object[] Divisors


double[] DivisorsChrominance


double[] DivisorsLuminance


int N
          DCT Block Size - default 8

int QUALITY
          Image Quality (0-100) - default 80 (good image / good compression)

java.lang.Object[] quantum


int[] quantum_chrominance
          Quantitization Matrix for chrominance.

int[] quantum_luminance
          Quantitization Matrix for luminace.

Constructor Summary

DCT(int QUALITY)
          Constructs a new DCT object.

Method Summary

double[][] forwardDCT(float[][] input)


double[][] forwardDCTExtreme(float[][] input)


private void initMatrix(int quality)


int[] quantizeBlock(double[][] inputData, int code)


int[] quantizeBlockExtreme(double[][] inputData, int code)


Methods inherited from class java.lang.Object

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

Field Detail

Divisors

public java.lang.Object[] Divisors

N

public int N

DCT Block Size - default 8

DivisorsChrominance

public double[] DivisorsChrominance

DivisorsLuminance

public double[] DivisorsLuminance

quantum

public java.lang.Object[] quantum

quantum_chrominance

public int[] quantum_chrominance

Quantitization Matrix for chrominance.

quantum_luminance

public int[] quantum_luminance

Quantitization Matrix for luminace.

QUALITY

public int QUALITY

Image Quality (0-100) - default 80 (good image / good compression)

Constructor Detail

DCT

public DCT(int QUALITY)

Constructs a new DCT object. Initializes the cosine transform matrix these are used when computing the DCT and it's inverse. This also initializes the run length counters and the ZigZag sequence. Note that the image quality can be worse than 25 however the image will be extemely pixelated, usually to a block size of N.

Method Detail

forwardDCT

public double[][] forwardDCT(float[][] input)

forwardDCTExtreme

public double[][] forwardDCTExtreme(float[][] input)

quantizeBlock

public int[] quantizeBlock(double[][] inputData,
                           int code)

quantizeBlockExtreme

public int[] quantizeBlockExtreme(double[][] inputData,
                                  int code)

initMatrix

private void initMatrix(int quality)