org.generation5.vision
Class GreyscaleFilter

java.lang.Object
  org.generation5.vision.Filter
      org.generation5.vision.GreyscaleFilter

public class GreyscaleFilter

extends Filter

This class converts an RGB colour to a greyscale image.

Field Summary

static int	BT709 BT709 Greyscale: Red: 0.2125 Green: 0.7154 Blue: 0.0721
protected int	greyscaleType The greyscale type (BT709, Y or RMY)
static int	RMY RMY Greyscale: Red: 0.5 Green: 0.419 Blue: 0.081
static int	Y Y-Greyscale (YIQ/NTSC): Red: 0.299 Green: 0.587 Blue: 0.114

Constructor Summary

GreyscaleFilter()
Creates a new instance of GreyscaleFilter

Method Summary

protected int	calculateGrey(int r, int g, int b) Calculate the grey value according to the grey conversion set.
java.awt.image.BufferedImage	filter(java.awt.image.BufferedImage image, java.awt.image.BufferedImage output) Convert an RGB image to greyscale.
static java.awt.image.BufferedImage	toGrey(java.awt.image.BufferedImage input, java.awt.image.BufferedImage output) A static utility function to generate a greyscale image.
java.lang.String	toString()

Methods inherited from class org.generation5.vision.Filter

filter, verifyOutput, verifyOutput, verifyOutput

Methods inherited from class java.lang.Object

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

Field Detail

BT709

public static final int BT709

BT709 Greyscale: Red: 0.2125 Green: 0.7154 Blue: 0.0721

See Also:

Constant Field Values

Y

public static final int Y

Y-Greyscale (YIQ/NTSC): Red: 0.299 Green: 0.587 Blue: 0.114

See Also:

Constant Field Values

RMY

public static final int RMY

RMY Greyscale: Red: 0.5 Green: 0.419 Blue: 0.081

See Also:

Constant Field Values

greyscaleType

protected int greyscaleType

The greyscale type (BT709, Y or RMY)

Constructor Detail

GreyscaleFilter

public GreyscaleFilter()

Creates a new instance of GreyscaleFilter

Method Detail

filter

public java.awt.image.BufferedImage filter(java.awt.image.BufferedImage image,
                                           java.awt.image.BufferedImage output)

Convert an RGB image to greyscale.

Specified by:

filter in class Filter

Parameters:

output - the output image (optional).

image - the input image.

Returns:

the output image.

See Also:

Filter.verifyOutput(BufferedImage, BufferedImage)

toGrey

public static java.awt.image.BufferedImage toGrey(java.awt.image.BufferedImage input,
                                                  java.awt.image.BufferedImage output)

A static utility function to generate a greyscale image. Simply implemented as: GreyscaleFilter grey = new GreyscaleFilter(); return grey.filter(input, output);

Parameters:

input - the input image.

output - the output image (optional).

Returns:

the greyscale image.

calculateGrey

protected int calculateGrey(int r,
                            int g,
                            int b)

Calculate the grey value according to the grey conversion set.

Parameters:

r - the red value.

g - the green value.

b - the blue value.

Returns:

the calculated grey value.

toString

public java.lang.String toString()