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package java.awt.image;
The Kernel class defines a matrix that describes how a specified pixel and its surrounding pixels affect the value computed for the pixel's position in the output image of a filtering operation. The X origin and Y origin indicate the kernel matrix element that corresponds to the pixel position for which an output value is being computed. See Also:
/**
* The {@code Kernel} class defines a matrix that describes how a
* specified pixel and its surrounding pixels affect the value
* computed for the pixel's position in the output image of a filtering
* operation. The X origin and Y origin indicate the kernel matrix element
* that corresponds to the pixel position for which an output value is
* being computed.
*
* @see ConvolveOp
*/
public class Kernel implements Cloneable {
private int width;
private int height;
private int xOrigin;
private int yOrigin;
private float[] data;
private static native void initIDs();
static {
ColorModel.loadLibraries();
initIDs();
}
Constructs a Kernel object from an array of floats. The first widthheight elements of the data array are copied. If the length of the data array is less than width*height, an IllegalArgumentException is thrown. The X origin is (width-1)/2 and the Y origin is (height-1)/2. Params: - width – width of the kernel
- height – height of the kernel
- data – kernel data in row major order
Throws: - IllegalArgumentException – if the length of
data is less than the product of width and height
/**
* Constructs a {@code Kernel} object from an array of floats.
* The first {@code width}*{@code height} elements of
* the {@code data} array are copied.
* If the length of the {@code data} array is less
* than width*height, an {@code IllegalArgumentException} is thrown.
* The X origin is (width-1)/2 and the Y origin is (height-1)/2.
* @param width width of the kernel
* @param height height of the kernel
* @param data kernel data in row major order
* @throws IllegalArgumentException if the length of {@code data}
* is less than the product of {@code width} and
* {@code height}
*/
public Kernel(int width, int height, float[] data) {
this.width = width;
this.height = height;
this.xOrigin = (width-1)>>1;
this.yOrigin = (height-1)>>1;
int len = width*height;
if (data.length < len) {
throw new IllegalArgumentException("Data array too small "+
"(is "+data.length+
" and should be "+len);
}
this.data = new float[len];
System.arraycopy(data, 0, this.data, 0, len);
}
Returns the X origin of this Kernel. Returns: the X origin.
/**
* Returns the X origin of this {@code Kernel}.
* @return the X origin.
*/
public final int getXOrigin(){
return xOrigin;
}
Returns the Y origin of this Kernel. Returns: the Y origin.
/**
* Returns the Y origin of this {@code Kernel}.
* @return the Y origin.
*/
public final int getYOrigin() {
return yOrigin;
}
Returns the width of this Kernel. Returns: the width of this Kernel.
/**
* Returns the width of this {@code Kernel}.
* @return the width of this {@code Kernel}.
*/
public final int getWidth() {
return width;
}
Returns the height of this Kernel. Returns: the height of this Kernel.
/**
* Returns the height of this {@code Kernel}.
* @return the height of this {@code Kernel}.
*/
public final int getHeight() {
return height;
}
Returns the kernel data in row major order. The data array is returned. If data is null, a new array is allocated. Params: - data – if non-null, contains the returned kernel data
Throws: - IllegalArgumentException – if
data is less than the size of this Kernel
Returns: the data array containing the kernel data in row major order or, if data is null, a newly allocated array containing the kernel data in row major order
/**
* Returns the kernel data in row major order.
* The {@code data} array is returned. If {@code data}
* is {@code null}, a new array is allocated.
* @param data if non-null, contains the returned kernel data
* @return the {@code data} array containing the kernel data
* in row major order or, if {@code data} is
* {@code null}, a newly allocated array containing
* the kernel data in row major order
* @throws IllegalArgumentException if {@code data} is less
* than the size of this {@code Kernel}
*/
public final float[] getKernelData(float[] data) {
if (data == null) {
data = new float[this.data.length];
}
else if (data.length < this.data.length) {
throw new IllegalArgumentException("Data array too small "+
"(should be "+this.data.length+
" but is "+
data.length+" )");
}
System.arraycopy(this.data, 0, data, 0, this.data.length);
return data;
}
Clones this object.
Returns: a clone of this object.
/**
* Clones this object.
* @return a clone of this object.
*/
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException e) {
// this shouldn't happen, since we are Cloneable
throw new InternalError(e);
}
}
}