anwtfilterfloat.java

java 实现的小波压缩库代码,内部包含了分析器

/*
 * CVS identifier:
 *
 * $Id: AnWTFilterFloat.java,v 1.7 2000/09/05 09:25:37 grosbois Exp $
 *
 * Class:                   AnWTFilterFloat
 *
 * Description:             A specialized wavelet filter interface that
 *                          works on float data.
 *
 *
 *
 * COPYRIGHT:
 * 
 * This software module was originally developed by Rapha雔 Grosbois and
 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
 * Askel鰂 (Ericsson Radio Systems AB); and Bertrand Berthelot, David
 * Bouchard, F閘ix Henry, Gerard Mozelle and Patrice Onno (Canon Research
 * Centre France S.A) in the course of development of the JPEG2000
 * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
 * software module is an implementation of a part of the JPEG 2000
 * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
 * Systems AB and Canon Research Centre France S.A (collectively JJ2000
 * Partners) agree not to assert against ISO/IEC and users of the JPEG
 * 2000 Standard (Users) any of their rights under the copyright, not
 * including other intellectual property rights, for this software module
 * with respect to the usage by ISO/IEC and Users of this software module
 * or modifications thereof for use in hardware or software products
 * claiming conformance to the JPEG 2000 Standard. Those intending to use
 * this software module in hardware or software products are advised that
 * their use may infringe existing patents. The original developers of
 * this software module, JJ2000 Partners and ISO/IEC assume no liability
 * for use of this software module or modifications thereof. No license
 * or right to this software module is granted for non JPEG 2000 Standard
 * conforming products. JJ2000 Partners have full right to use this
 * software module for his/her own purpose, assign or donate this
 * software module to any third party and to inhibit third parties from
 * using this software module for non JPEG 2000 Standard conforming
 * products. This copyright notice must be included in all copies or
 * derivative works of this software module.
 * 
 * Copyright (c) 1999/2000 JJ2000 Partners.
 * 
 * 
 * 
 */


package jj2000.j2k.wavelet.analysis;

import jj2000.j2k.wavelet.*;
import jj2000.j2k.image.*;

/**
 * This extends the analysis wavelet filter general definitions of
 * AnWTFilter by adding methods that work for float data
 * specifically. Implementations that work on float data should inherit
 * from this class.
 *
 * <P>See the AnWTFilter class for details such as
 * normalization, how to split odd-length signals, etc.
 *
 * <P>The advantage of using the specialized method is that no casts
 * are performed.
 *
 * @see AnWTFilter
 *
 */
public abstract class AnWTFilterFloat extends AnWTFilter {
    
    /**
     * A specific version of the analyze_lpf() method that works on int
     * data. See the general description of the analyze_lpf() method in
     * the AnWTFilter class for more details.
     *
     * @param inSig This is the array that contains the input
     * signal.
     *
     * @param inOff This is the index in inSig of the first sample to
     * filter.
     *
     * @param inLen This is the number of samples in the input signal
     * to filter.
     *
     * @param inStep This is the step, or interleave factor, of the
     * input signal samples in the inSig array.
     *
     * @param lowSig This is the array where the low-pass output
     * signal is placed.
     *
     * @param lowOff This is the index in lowSig of the element where
     * to put the first low-pass output sample.
     *
     * @param lowStep This is the step, or interleave factor, of the
     * low-pass output samples in the lowSig array.
     *
     * @param highSig This is the array where the high-pass output
     * signal is placed.
     *
     * @param highOff This is the index in highSig of the element where
     * to put the first high-pass output sample.
     *
     * @param highStep This is the step, or interleave factor, of the
     * high-pass output samples in the highSig array.
     *
     * @see AnWTFilter#analyze_lpf
     *
     *
     *
     *
     * */
    public abstract 
        void analyze_lpf(float inSig[], int inOff, int inLen, int inStep,
                     float lowSig[], int lowOff, int lowStep,
                     float highSig[], int highOff, int highStep);

    /**
     * The general version of the analyze_lpf() method, it just calls the
     * specialized version. See the description of the analyze_lpf()
     * method of the AnWTFilter class for more details.
     *
     * @param inSig This is the array that contains the input
     * signal. It must be an float[].
     *
     * @param inOff This is the index in inSig of the first sample to
     * filter.
     *
     * @param inLen This is the number of samples in the input signal
     * to filter.
     *
     * @param inStep This is the step, or interleave factor, of the
     * input signal samples in the inSig array.
     *
     * @param lowSig This is the array where the low-pass output
     * signal is placed. It must be an float[].
     *
     * @param lowOff This is the index in lowSig of the element where
     * to put the first low-pass output sample.
     *
     * @param lowStep This is the step, or interleave factor, of the
     * low-pass output samples in the lowSig array.
     *
     * @param highSig This is the array where the high-pass output
     * signal is placed. It must be an float[].
     *
     * @param highOff This is the index in highSig of the element where
     * to put the first high-pass output sample.
     *
     * @param highStep This is the step, or interleave factor, of the
     * high-pass output samples in the highSig array.
     *
     * @see AnWTFilter#analyze_lpf
     *
     *
     * */
    public void analyze_lpf(Object inSig, int inOff, int inLen, int inStep,
                    Object lowSig, int lowOff, int lowStep,
                    Object highSig, int highOff, int highStep) {
                    
        analyze_lpf((float[])inSig, inOff, inLen, inStep,
            (float[])lowSig, lowOff, lowStep,
            (float[])highSig, highOff, highStep);
    }
                     
    /**
     * A specific version of the analyze_hpf() method that works on int
     * data. See the general description of the analyze_hpf() method in the 
     * AnWTFilter class for more details.
     *
     * @param inSig This is the array that contains the input
     * signal.
     *
     * @param inOff This is the index in inSig of the first sample to
     * filter.
     *
     * @param inLen This is the number of samples in the input signal
     * to filter.
     *
     * @param inStep This is the step, or interleave factor, of the
     * input signal samples in the inSig array.
     *
     * @param lowSig This is the array where the low-pass output
     * signal is placed.
     *
     * @param lowOff This is the index in lowSig of the element where
     * to put the first low-pass output sample.
     *
     * @param lowStep This is the step, or interleave factor, of the
     * low-pass output samples in the lowSig array.
     *
     * @param highSig This is the array where the high-pass output
     * signal is placed.
     *
     * @param highOff This is the index in highSig of the element where
     * to put the first high-pass output sample.
     *
     * @param highStep This is the step, or interleave factor, of the
     * high-pass output samples in the highSig array.
     *
     * @see AnWTFilter#analyze_hpf
     *
     *
     * */        
    public abstract 
        void analyze_hpf(float inSig[], int inOff, int inLen, int inStep,
                     float lowSig[], int lowOff, int lowStep,
                     float highSig[], int highOff, int highStep);
    
    
    
    /**
     * The general version of the analyze_hpf() method, it just calls the
     * specialized version. See the description of the analyze_hpf()
     * method of the AnWTFilter class for more details.
     *
     * @param inSig This is the array that contains the input
     * signal. It must be an float[].
     *
     * @param inOff This is the index in inSig of the first sample to
     * filter.
     *
     * @param inLen This is the number of samples in the input signal
     * to filter.
     *
     * @param inStep This is the step, or interleave factor, of the
     * input signal samples in the inSig array.
     *
     * @param lowSig This is the array where the low-pass output
     * signal is placed. It must be an float[].
     *
     * @param lowOff This is the index in lowSig of the element where
     * to put the first low-pass output sample.
     *
     * @param lowStep This is the step, or interleave factor, of the
     * low-pass output samples in the lowSig array.
     *
     * @param highSig This is the array where the high-pass output
     * signal is placed. It must be an float[].
     *
     * @param highOff This is the index in highSig of the element where
     * to put the first high-pass output sample.
     *
     * @param highStep This is the step, or interleave factor, of the
     * high-pass output samples in the highSig array.
     *
     * @see AnWTFilter#analyze_hpf
     *
     *
     * */
    public void analyze_hpf(Object inSig, int inOff, int inLen, int inStep,
                    Object lowSig, int lowOff, int lowStep,
                    Object highSig, int highOff, int highStep) {
                    
        analyze_hpf((float[])inSig, inOff, inLen, inStep,
            (float[])lowSig, lowOff, lowStep,
            (float[])highSig, highOff, highStep);
    }
    
    /**
     * Returns the type of data on which this filter works, as defined
     * in the DataBlk interface, which is always TYPE_FLOAT for this
     * class.
     *
     * @return The type of data as defined in the DataBlk interface.
     *
     * @see jj2000.j2k.image.DataBlk
     *
     *
     * */
    public int getDataType() {
        return DataBlk.TYPE_FLOAT;
    }
}