net.grelf.image

Class ByteMask

java.lang.Object

net.grelf.image.ByteMask

Direct Known Subclasses:

BlobMask

public class ByteMask
extends java.lang.Object

Holding a 2D byte array, eg for use as a binary mask over an image after segmentation.

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[][]	data
static byte	MASK_CLEAR
static byte	MASK_SET For the blob detection mechanism to work, thresholding/segmentation must set value 3 at all detected pixels and 0 at all others.

Constructor Summary

Constructors

Constructor and Description
ByteMask(byte[][] mask) Construct with a reference to an external byte array.
ByteMask(int width, int height) Construct an empty mask of the given dimensions.

Method Summary

Modifier and Type	Method and Description
void	dilate() Operation on mask.
void	erode() Operation on mask.
byte[][]	getData() Get a reference to the mask array itself.
java.util.List<Line>	houghLines() Apply a Hough transform to detect straight line segments in this mask.
void	setData(byte[][] aMask) Set the mask array.

Methods inherited from class java.lang.Object

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

Field Detail

MASK_SET

public static final byte MASK_SET

For the blob detection mechanism to work, thresholding/segmentation must set value 3 at all detected pixels and 0 at all others.

See Also:

Constant Field Values

MASK_CLEAR

public static final byte MASK_CLEAR

See Also:

Constant Field Values

data

protected byte[][] data

Constructor Detail

ByteMask

public ByteMask(int width,
                int height)

Construct an empty mask of the given dimensions.

ByteMask

public ByteMask(byte[][] mask)

Construct with a reference to an external byte array.

Method Detail

getData

public byte[][] getData()

Get a reference to the mask array itself.

setData

public void setData(byte[][] aMask)

Set the mask array.

dilate

public void dilate()

Operation on mask. Pixels which are set become a 3 x 3 block of set pixels. Useful for joining up poorly segmented blobs. Does nothing if mask is not set.

erode

public void erode()

Operation on mask. Pixels which are clear (0) become a 3 x 3 block of clear pixels. Useful for separating poorly segmented blobs which are joined by narrow necks. Does nothing if mask is not set.

houghLines

public java.util.List<Line> houghLines()

Apply a Hough transform to detect straight line segments in this mask. Returns an empty list if no lines are detected.