fi.helsinki.cs.ohtu.mpeg2.video
Class YCbCrToRGBConverter

java.lang.Object
  fi.helsinki.cs.ohtu.mpeg2.video.YCbCrToRGBConverter

public class YCbCrToRGBConverter
extends java.lang.Object

A converter from YCbCr to RGB.

Field Summary

private double[]	coefficients
static double[]	ITU_R_BT_470_2_COEFFICIENTS If sequence header matrix coefficients value == 5.
static double[]	ITU_R_BT_709_COEFFICIENTS If sequence header matrix coefficients value == 1.

Constructor Summary

YCbCrToRGBConverter()
Initializes with default coefficients.

YCbCrToRGBConverter(double[] c)
Initializes with given coefficients.

Method Summary

int[]	convert(int y, int cb, int cr) Converts from yCbCr to RGB.
void	setCoefficients(double[] coefficients) Sets coefficients.

Methods inherited from class java.lang.Object

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

Field Detail

ITU_R_BT_709_COEFFICIENTS

public static final double[] ITU_R_BT_709_COEFFICIENTS

If sequence header matrix coefficients value == 1. The formula for HDTV colour. Matrix inversion done in freemat(Matlab compatible)

ITU_R_BT_470_2_COEFFICIENTS

public static final double[] ITU_R_BT_470_2_COEFFICIENTS

If sequence header matrix coefficients value == 5. Analogue television systems. Matrix inversion done in freemat(Matlab compatible)

coefficients

private double[] coefficients

Constructor Detail

YCbCrToRGBConverter

public YCbCrToRGBConverter()

Initializes with default coefficients. Initializes the converter and uses ITU_R_BT_709_COEFFICIENTS as the coefficients.

YCbCrToRGBConverter

public YCbCrToRGBConverter(double[] c)

Initializes with given coefficients.

Parameters:

c - coefficient table to use for conversion.

Method Detail

setCoefficients

public void setCoefficients(double[] coefficients)

Sets coefficients.

Parameters:

coefficients - array containing the matrix coefficients used in conversion.

convert

public int[] convert(int y,
                     int cb,
                     int cr)

Converts from yCbCr to RGB. Performs the conversion from given YCbCr values to RGB using the coefficients set for this YCbCrToRGBConverter object.

Parameters:

y - luminance

cb - blue chrominance

cr - red chrominance

Returns:

{r, g, b} in an array.