com.googlecode.leptonica.android

Class MorphApp

java.lang.Object

com.googlecode.leptonica.android.MorphApp

public class MorphApp
extends Object

Composite image processing operations.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	MorphApp.TophatType

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_HEIGHT
static int	DEFAULT_WIDTH
static int	L_TOPHAT_BLACK
static int	L_TOPHAT_WHITE

Constructor Summary

Constructors

Constructor and Description
MorphApp()

Method Summary

Modifier and Type	Method and Description
static Pix	pixFastTophat(Pix pixs, int xsize, int ysize, int type) Performs a tophat-like operation.
static Pix	pixFastTophatBlack(Pix pixs) Performs a tophat-like operation emphasizing small dark regions using default values.
static Pix	pixFastTophatWhite(Pix pixs) Performs a tophat-like operation emphasizing small bright regions using default values.
static Pix	pixTophat(Pix pixs, int hsize, int vsize, int type) Performs a tophat transform.

Methods inherited from class java.lang.Object

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

Field Detail

L_TOPHAT_WHITE

public static final int L_TOPHAT_WHITE

See Also:

Constant Field Values

L_TOPHAT_BLACK

public static final int L_TOPHAT_BLACK

See Also:

Constant Field Values

DEFAULT_WIDTH

public static final int DEFAULT_WIDTH

See Also:

Constant Field Values

DEFAULT_HEIGHT

public static final int DEFAULT_HEIGHT

See Also:

Constant Field Values

Constructor Detail

MorphApp

public MorphApp()

Method Detail

pixTophat

public static Pix pixTophat(Pix pixs,
                            int hsize,
                            int vsize,
                            int type)

Performs a tophat transform.

Notes:

1. Sel is a brick with all elements being hits
2. If hsize = vsize = 1, returns an image with all 0 data.
3. The L_TOPHAT_WHITE flag emphasizes small bright regions, whereas the L_TOPHAT_BLACK flag emphasizes small dark regions. The L_TOPHAT_WHITE tophat can be accomplished by doing a L_TOPHAT_BLACK tophat on the inverse, or v.v.

Parameters:

pixs - Source pix (8bpp)

hsize - (of Sel; must be odd; origin implicitly in center)

vsize - (ditto)

type - L_TOPHAT_WHITE: image - opening or L_TOPHAT_BLACK: closing - image

Returns:

a new Pix image

pixFastTophatBlack

public static Pix pixFastTophatBlack(Pix pixs)

Performs a tophat-like operation emphasizing small dark regions using default values.

Parameters:

pixs - Source pix (8bpp)

Returns:

a new Pix image

See Also:

pixFastTophat(Pix, int, int, int)

pixFastTophatWhite

public static Pix pixFastTophatWhite(Pix pixs)

Performs a tophat-like operation emphasizing small bright regions using default values.

Parameters:

pixs - Source pix (8bpp)

Returns:

a new Pix image

See Also:

pixFastTophat(Pix, int, int, int)

pixFastTophat

public static Pix pixFastTophat(Pix pixs,
                                int xsize,
                                int ysize,
                                int type)

Performs a tophat-like operation.

Notes:

1. Don't be fooled. This is NOT a tophat. It is a tophat-like operation, where the result is similar to what you'd get if you used an erosion instead of an opening, or a dilation instead of a closing.
2. Instead of opening or closing at full resolution, it does a fast downscale/minmax operation, then a quick small smoothing at low res, a replicative expansion of the "background" to full res, and finally a removal of the background level from the input image. The smoothing step may not be important.
3. It does not remove noise as well as a tophat, but it is 5 to 10 times faster. If you need the preciseness of the tophat, don't use this.
4. The L_TOPHAT_WHITE flag emphasizes small bright regions, whereas the L_TOPHAT_BLACK flag emphasizes small dark regions.

Parameters:

pixs - Source pix (8bpp)

xsize - width of max/min op, smoothing; any integer >= 1

ysize - height of max/min op, smoothing; any integer >= 1

type - L_TOPHAT_WHITE: image - min, or L_TOPHAT_BLACK: max - image

Returns:

a new Pix image