com.googlecode.leptonica.android

Class Enhance

java.lang.Object

com.googlecode.leptonica.android.Enhance

public class Enhance
extends Object

Image sharpening methods.

Field Summary

Fields

Modifier and Type	Field and Description
static float	DEFAULT_UNSHARP_FRACTION
static int	DEFAULT_UNSHARP_HALFWIDTH

Constructor Summary

Constructors

Constructor and Description
Enhance()

Method Summary

Modifier and Type	Method and Description
static Pix	unsharpMasking(Pix pixs) Performs unsharp masking (edge enhancement) using default values.
static Pix	unsharpMasking(Pix pixs, int halfwidth, float fraction) Performs unsharp masking (edge enhancement).

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_UNSHARP_HALFWIDTH

public static final int DEFAULT_UNSHARP_HALFWIDTH

See Also:

Constant Field Values

DEFAULT_UNSHARP_FRACTION

public static final float DEFAULT_UNSHARP_FRACTION

See Also:

Constant Field Values

Constructor Detail

Enhance

public Enhance()

Method Detail

unsharpMasking

public static Pix unsharpMasking(Pix pixs)

Performs unsharp masking (edge enhancement) using default values.

Parameters:

pixs - Source image

Returns:

an edge-enhanced Pix image or copy if no enhancement requested

See Also:

unsharpMasking(Pix, int, float)

unsharpMasking

public static Pix unsharpMasking(Pix pixs,
                                 int halfwidth,
                                 float fraction)

Performs unsharp masking (edge enhancement).

Notes:

• We use symmetric smoothing filters of odd dimension, typically use sizes of 3, 5, 7, etc. The halfwidth parameter for these is (size - 1)/2; i.e., 1, 2, 3, etc.
• The fract parameter is typically taken in the range: 0.2 < fract < 0.7

Parameters:

pixs - The source image

halfwidth - The half-width of the smoothing filter.

fraction - The fraction of edge to be added back into the source image.

Returns:

an edge-enhanced Pix image or copy if no enhancement requested