imagingbook.pub.color.quantize

Class ColorQuantizer

java.lang.Object

imagingbook.pub.color.quantize.ColorQuantizer

Direct Known Subclasses:

KMeansClusteringQuantizer, KMeansClusteringQuantizerApache, MedianCutQuantizer, OctreeQuantizer

public abstract class ColorQuantizer
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	MAX_RGB

Constructor Summary

Constructors

Constructor and Description
ColorQuantizer()

Method Summary

Modifier and Type	Method and Description
protected int	findColorIndex(int p) Finds the color table index of the color that is "closest" to the supplied RGB color (minimum Euclidean distance in color space).
abstract int[][]	getColorMap() Retrieves the color map produced by this color quantizer.
protected int[]	intToRgb(int rgb)
void	listColorMap()
protected int	log2(int n)
ij.process.ByteProcessor	quantize(ij.process.ColorProcessor cp) Performs color quantization on the given full-color RGB image and creates an indexed color image.
int	quantize(int p) Performs color quantization on the given ARGB-encoded color value and returns the associated quantized color.
int[]	quantize(int[] origPixels) Performs color quantization on the given sequence of ARGB-encoded color values and returns a new sequence of quantized colors.
protected int	rgbToInt(int red, int grn, int blu)
protected int	sqr(int k)

Methods inherited from class java.lang.Object

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

Field Detail

MAX_RGB

protected static final int MAX_RGB

See Also:

Constant Field Values

Constructor Detail

ColorQuantizer

public ColorQuantizer()

Method Detail

getColorMap

public abstract int[][] getColorMap()

Retrieves the color map produced by this color quantizer. The returned array is in the format int[idx][rgb], where rgb = 0 (red), 1 (green), 2 (blue) and 0 ≤ idx < nColors. This method must be implemented by any derived concrete class.

Returns:

The table of quantization colors.

quantize

public ij.process.ByteProcessor quantize(ij.process.ColorProcessor cp)

Performs color quantization on the given full-color RGB image and creates an indexed color image.

Parameters:

cp - The original full-color RGB image.

Returns:

The quantized (indexed color) image.

quantize

public int[] quantize(int[] origPixels)

Performs color quantization on the given sequence of ARGB-encoded color values and returns a new sequence of quantized colors.

Parameters:

origPixels - The original ARGB-encoded color values.

Returns:

The quantized ARGB-encoded color values.

quantize

public int quantize(int p)

Performs color quantization on the given ARGB-encoded color value and returns the associated quantized color.

Parameters:

p - The original ARGB-encoded color value.

Returns:

The quantized ARGB-encoded color value.

findColorIndex

protected int findColorIndex(int p)

Finds the color table index of the color that is "closest" to the supplied RGB color (minimum Euclidean distance in color space). This method may be overridden by inheriting classes, for example, to use quick indexing in the octree method.

Parameters:

p - Original color, encoded as an ARGB integer.

Returns:

The associated color table index.

listColorMap

public void listColorMap()

log2

protected int log2(int n)

sqr

protected int sqr(int k)

intToRgb

protected int[] intToRgb(int rgb)

rgbToInt

protected int rgbToInt(int red,
                       int grn,
                       int blu)