Source Code Cross Referenced for Wavelet8.java in  » Science » JSci » JSci » maths » wavelet » daubechies8 » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » JSci » JSci.maths.wavelet.daubechies8 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package JSci.maths.wavelet.daubechies8;
002:
003:        import JSci.maths.wavelet.*;
004:
005:        /******************************************
006:         * Daubechies wavelets adapted to the
007:         * interval by Meyer. Thanks to Pierre Vial
008:         * for the filters.
009:         * @author Daniel Lemire
010:         *****************************************/
011:        public final class Wavelet8 extends MultiscaleFunction implements 
012:                Cloneable {
013:            private int n0;
014:            private int k;
015:            private final static Daubechies8 cdf = new Daubechies8();
016:
017:            /*******************************
018:             * Return a String representation
019:             * of the object
020:             ********************************/
021:            public String toString() {
022:                String ans = new String("[n0=");
023:                ans.concat(Integer.toString(n0));
024:                ans.concat("][k=");
025:                ans.concat(Integer.toString(k));
026:                ans.concat("]");
027:                return (ans);
028:            }
029:
030:            /*****************************************
031:             * Check if another object is equal to this
032:             * Wavelet8 object
033:             ******************************************/
034:            public boolean equals(Object a) {
035:                if ((a != null) && (a instanceof  Wavelet8)) {
036:                    Wavelet8 iv = (Wavelet8) a;
037:                    return (this .dimension(0) == iv.dimension(0))
038:                            && (this .position() == iv.position());
039:                }
040:                return false;
041:            }
042:
043:            public Wavelet8(int N0, int K) {
044:                setParameters(N0, K);
045:            }
046:
047:            public Wavelet8() {
048:            }
049:
050:            /****************************************
051:             * This method is used to compute
052:             * how the number of scaling functions
053:             * changes from on scale to the other.
054:             * Basically, if you have k scaling
055:             * function and a filter of type t, you'll
056:             * have 2*k+t scaling functions at the
057:             * next scale (dyadic case).
058:             * Notice that this method assumes
059:             * that one is working with the dyadic
060:             * grid while the method "previousDimension"
061:             * define in the interface "filter" doesn't.
062:             ******************************************/
063:            public int getFilterType() {
064:                return (cdf.filtretype);
065:            }
066:
067:            /**********************************************
068:             * Set the parameters for this object
069:             * @param N0 number of scaling function on the
070:             *   scale of this object
071:             * @param K position or number of this object
072:             * @exception IllegalScalingException if N0 is not
073:             *   large enough
074:             ***********************************************/
075:            public void setParameters(int N0, int K) {
076:                if (N0 < cdf.minlength) {
077:                    throw new IllegalScalingException(N0, cdf.minlength);
078:                }
079:                n0 = N0;
080:                k = K;
081:            }
082:
083:            /********************************************
084:             * Return a copy of this object
085:             *********************************************/
086:            public Object clone() {
087:                Wavelet8 w = (Wavelet8) super .clone();
088:                w.n0 = n0;
089:                w.k = k;
090:                return (w);
091:            }
092:
093:            /************************************************
094:             * Return as an array the sampled values
095:             * of the function
096:             * @param j number of iterations
097:             *************************************************/
098:            public double[] evaluate(int j) {
099:                return (cdf.evalWavelet(n0, k, j));
100:            }
101:
102:            /****************************************************
103:             * Given that the wavelet is written in terms of
104:             * a scale containing dimension() scaling functions and
105:             * going jfin scales ahead (iterating jfin times),
106:             * tells you how many scaling functions you'll need.
107:             * @param jfin number of iterations
108:             ******************************************************/
109:            public int dimension(int jfin) {
110:                return (Cascades.dimension(n0, jfin + 1, cdf.filtretype));
111:            }
112:
113:            /****************************************************
114:             * Number of scaling functions at scale where this
115:             * wavelet belongs.
116:             *****************************************************/
117:            public int dimension() {
118:                return (dimension(0));
119:            }
120:
121:            /****************************************
122:             * Tells you what is the number of this
123:             * wavelet. Wavelets are numbered from left
124:             * to right with the one at the left
125:             * boundary being noted 0.
126:             *****************************************/
127:            public int position() {
128:                return (k);
129:            }
130:        }
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