com.googlecode.leptonica.android

Class MorphApp

com.googlecode.leptonica.android.MorphApp

public class MorphApp

Composite image processing operations.

Field Detail

L_TOPHAT_WHITE

public static int L_TOPHAT_WHITE

See Also:

Constant Field Values

L_TOPHAT_BLACK

public static int L_TOPHAT_BLACK

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Constant Field Values

DEFAULT_WIDTH

public static int DEFAULT_WIDTH

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Constant Field Values

DEFAULT_HEIGHT

public static int DEFAULT_HEIGHT

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Constant Field Values

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:

org.jetbrains.dokka.NodeRenderContent@1e95f9ce: 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:

org.jetbrains.dokka.NodeRenderContent@43e9be84: 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:

org.jetbrains.dokka.NodeRenderContent@7463e14a: 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:

org.jetbrains.dokka.NodeRenderContent@28698e4c: a new Pix image