Package seamcarving

Class DualGradientEnergyFunction

java.lang.Object

seamcarving.DualGradientEnergyFunction

All Implemented Interfaces:

EnergyFunction

public class DualGradientEnergyFunction
extends Object
implements EnergyFunction

Dual-gradient implementation of the EnergyFunction interface for Picture objects.

See Also:

EnergyFunction, Picture

Constructor Summary

Constructors

Constructor	Description
DualGradientEnergyFunction()

Method Summary

Modifier and Type	Method	Description
double	apply(Picture picture, int x, int y)	Returns the energy of pixel (x, y) in the given picture.
private static int	blue(int rgb)	Returns the 8-bit blue color component as an int.
private static double	centralDiff(int rgb1, int rgb2)	Returns the central difference between the two pixels' colors.
private static double	forwardDiff(int rgb1, int rgb2, int rgb3)	Returns the forward/backward difference for the three adjacent pixels' colors.
private static int	green(int rgb)	Returns the 8-bit green color component as an int.
private static double	horizontalDerivative(Picture picture, int x, int y)	Returns the horizontal derivative for the (x, y) pixel in the picture.
private static int	red(int rgb)	Returns the 8-bit red color component as an int.
private static double	verticalDerivative(Picture picture, int x, int y)	Returns the vertical derivative for the (x, y) pixel in the picture.

Methods inherited from class java.lang.Object

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

Constructor Detail

DualGradientEnergyFunction

public DualGradientEnergyFunction()

Method Detail

horizontalDerivative

private static double horizontalDerivative(Picture picture,
                                           int x,
                                           int y)

Returns the horizontal derivative for the (x, y) pixel in the picture.

Parameters:

picture - the input picture.

x - the x-index into the picture.

y - the y-index into the picture.

Returns:

the horizontal derivative for the (x, y) pixel in the picture.

verticalDerivative

private static double verticalDerivative(Picture picture,
                                         int x,
                                         int y)

Returns the vertical derivative for the (x, y) pixel in the picture.

Parameters:

picture - the input picture.

x - the x-index into the picture.

y - the y-index into the picture.

Returns:

the vertical derivative for the (x, y) pixel in the picture.

centralDiff

private static double centralDiff(int rgb1,
                                  int rgb2)

Returns the central difference between the two pixels' colors.

Parameters:

rgb1 - the first pixel's color.

rgb2 - the second pixel's color.

Returns:

the central difference between the two pixels' colors.

forwardDiff

private static double forwardDiff(int rgb1,
                                  int rgb2,
                                  int rgb3)

Returns the forward/backward difference for the three adjacent pixels' colors.

Parameters:

rgb1 - the first adjacent pixel's color.

rgb2 - the second adjacent pixel's color.

rgb3 - the third adjacent pixel's color.

Returns:

the forward/backward difference for the three adjacent pixels' colors.

red

private static int red(int rgb)

Returns the 8-bit red color component as an int.

Parameters:

rgb - 24-bit color represented as three 8-bit red-green-blue color components.

Returns:

the 8-bit red color component as an int.

green

private static int green(int rgb)

Returns the 8-bit green color component as an int.

Parameters:

rgb - 24-bit color represented as three 8-bit red-green-blue color components.

Returns:

the 8-bit green color component as an int.

blue

private static int blue(int rgb)

Returns the 8-bit blue color component as an int.

Parameters:

rgb - 24-bit color represented as three 8-bit red-green-blue color components.

Returns:

the 8-bit blue color component as an int.

apply

public double apply(Picture picture,
                    int x,
                    int y)

Description copied from interface: EnergyFunction

Returns the energy of pixel (x, y) in the given picture.

Specified by:

apply in interface EnergyFunction

Parameters:

picture - the input picture.

x - the x-index into the picture.

y - the y-index into the picture.

Returns:

the energy of pixel (x, y) in the given picture.