| java.lang.Object
 com.sun.media.jai.opimage.FFT
All known Subclasses: com.sun.media.jai.mlib.FFTmediaLib,
| FFT | | public class FFT (Code) | | The Fast Fourier Transform (FFT) class.
since:
EA3 |
| Field Summary | |
| final public static int | SCALING_DIMENSIONS
A flag indicating that the transform is to be scaled by the product
of its dimensions. | | final public static int | SCALING_NONE
A flag indicating that the transform is not to be scaled. | | final public static int | SCALING_UNITARY
A flag indicating that the transform is to be scaled by the square
root of the product of its dimensions. | | protected int | exponentSign
The sign of the exponential. | | protected double[] | imag
Work array for imaginary part. | | protected int | length
The length of the FFT. | | protected boolean | lengthIsSet
Initialization flag. | | protected double[] | real
Work array for real part. | | protected int | scaleType
The type of scaling. |
| Constructor Summary | |
| public | FFT(boolean negatedExponent, Integer scaleType, int length)
Construct a new FFT object. |
| Method Summary | |
| public void | getData(int dataType, Object realArg, int offsetReal, int strideReal, Object imagArg, int offsetImag, int strideImag)
Get data from the internal work data arrays of the FFT object.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. | | public void | getFCTData(int dataType, Object data, int offset, int stride)
Get data from the internal work data arrays of the FFT object after
an IFCT operation.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. | | public void | getIFCTData(int dataType, Object data, int offset, int stride)
Get data from the internal work data arrays of the FFT object after
an IFCT operation.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. | | public void | setData(int dataType, Object realArg, int offsetReal, int strideReal, Object imagArg, int offsetImag, int strideImag, int count)
Set the internal work data arrays of the FFT object.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. | | public void | setFCTData(int dataType, Object data, int offset, int stride, int count)
Set the internal work data arrays of the FFT object for use with
an FCT operation.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. | | public void | setIFCTData(int dataType, Object data, int offset, int stride, int count)
Set the internal work data arrays of the FFT object for use with
an IFCT operation.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. | | public void | setLength(int length)
Initialize the length-dependent fields. | | public void | transform()
Calculate the DFT of a complex sequence using the FFT algorithm. |
| SCALING_DIMENSIONS | | final public static int SCALING_DIMENSIONS(Code) | | A flag indicating that the transform is to be scaled by the product
of its dimensions.
|
| SCALING_NONE | | final public static int SCALING_NONE(Code) | | A flag indicating that the transform is not to be scaled.
|
| SCALING_UNITARY | | final public static int SCALING_UNITARY(Code) | | A flag indicating that the transform is to be scaled by the square
root of the product of its dimensions.
|
| exponentSign | | protected int exponentSign(Code) | | The sign of the exponential.
|
| imag | | protected double[] imag(Code) | | Work array for imaginary part.
|
| length | | protected int length(Code) | | The length of the FFT.
|
| lengthIsSet | | protected boolean lengthIsSet(Code) | | Initialization flag.
|
| real | | protected double[] real(Code) | | Work array for real part.
|
| scaleType | | protected int scaleType(Code) | | The type of scaling.
|
| FFT | | public FFT(boolean negatedExponent, Integer scaleType, int length)(Code) | | Construct a new FFT object.
Parameters:
negatedExponent - Whether the exponent is negated.
Parameters:
scaleType - The type of scaling to be applied.
Parameters:
length - The length of the FFT; must be a positive power of 2. |
| getData | | public void getData(int dataType, Object realArg, int offsetReal, int strideReal, Object imagArg, int offsetImag, int strideImag)(Code) | | Get data from the internal work data arrays of the FFT object.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. This should be eitherDataBuffer.TYPE_FLOAT or DataBuffer.TYPE_DOUBLE.
Parameters:
realArg - Float or double array of real parts.
Parameters:
offsetReal - Offset into the array of real parts.
Parameters:
strideReal - The real array stride value.
Parameters:
imagArg - Float or double array of imaginary parts.
Parameters:
offsetImag - Offset into the array of imaginary parts.
Parameters:
strideImag - The imaginary array stride value.
Parameters:
count - The number of values to copy. |
| getFCTData | | public void getFCTData(int dataType, Object data, int offset, int stride)(Code) | | Get data from the internal work data arrays of the FFT object after
an IFCT operation.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. This should be eitherDataBuffer.TYPE_FLOAT or DataBuffer.TYPE_DOUBLE.
Parameters:
data - The data as a float[] or double[].
Parameters:
offset - Offset into the data array.
Parameters:
stride - The array stride value.
Parameters:
count - The number of values to copy. |
| getIFCTData | | public void getIFCTData(int dataType, Object data, int offset, int stride)(Code) | | Get data from the internal work data arrays of the FFT object after
an IFCT operation.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. This should be eitherDataBuffer.TYPE_FLOAT or DataBuffer.TYPE_DOUBLE.
Parameters:
data - The data as a float[] or double[].
Parameters:
offset - Offset into the data array.
Parameters:
stride - The array stride value.
Parameters:
count - The number of values to copy. |
| setData | | public void setData(int dataType, Object realArg, int offsetReal, int strideReal, Object imagArg, int offsetImag, int strideImag, int count)(Code) | | Set the internal work data arrays of the FFT object.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. This should be eitherDataBuffer.TYPE_FLOAT or DataBuffer.TYPE_DOUBLE.
Parameters:
realArg - Float or double array of real parts.
Parameters:
offsetReal - Offset into the array of real parts.
Parameters:
strideReal - The real array stride value.
Parameters:
imagArg - Float or double array of imaginary parts.
Parameters:
offsetImag - Offset into the array of imaginary parts.
Parameters:
strideImag - The imaginary array stride value.
Parameters:
count - The number of values to copy. |
| setFCTData | | public void setFCTData(int dataType, Object data, int offset, int stride, int count)(Code) | | Set the internal work data arrays of the FFT object for use with
an FCT operation.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. This should be eitherDataBuffer.TYPE_FLOAT or DataBuffer.TYPE_DOUBLE.
Parameters:
data - The data as a float[] or double[].
Parameters:
offset - Offset into the data array.
Parameters:
stride - The array stride value.
Parameters:
count - The number of values to copy. |
| setIFCTData | | public void setIFCTData(int dataType, Object data, int offset, int stride, int count)(Code) | | Set the internal work data arrays of the FFT object for use with
an IFCT operation.
Parameters:
dataType - The data type of the source data according toone of the DataBuffer TYPE_* flags. This should be eitherDataBuffer.TYPE_FLOAT or DataBuffer.TYPE_DOUBLE.
Parameters:
data - The data as a float[] or double[].
Parameters:
offset - Offset into the data array.
Parameters:
stride - The array stride value.
Parameters:
count - The number of values to copy. |
| setLength | | public void setLength(int length)(Code) | | Initialize the length-dependent fields.
Parameters:
length - The length of the FFT; must be a positive power of 2. |
| transform | | public void transform()(Code) | | Calculate the DFT of a complex sequence using the FFT algorithm.
|
|
|