java实现DWT离散小波变换(附完整源码)
时间: 2023-07-23 21:32:27 浏览: 44
以下是Java实现DWT离散小波变换的完整源码,包括DWT类和测试代码:
```java
public class DWT {
private int levels;
private double[] wavelet;
public DWT(int levels, double[] wavelet) {
this.levels = levels;
this.wavelet = wavelet;
}
public void transform(double[] data) {
int n = data.length;
for (int i = 0; i < levels; i++) {
int m = n >> i;
double[] temp = new double[n];
for (int j = 0; j < m; j++) {
for (int k = 0; k < wavelet.length; k++) {
int index = (j * 2 - k + n) % n;
temp[j] += data[index] * wavelet[k];
}
}
System.arraycopy(temp, 0, data, 0, m);
}
}
}
```
测试代码:
```java
public class DWTTest {
public static void main(String[] args) {
double[] data = {1, 2, 3, 4, 5, 6, 7, 8};
int levels = 3;
double[] wavelet = {0.482962913145, 0.836516303738, 0.224143868042, -0.129409522551};
DWT dwt = new DWT(levels, wavelet);
dwt.transform(data);
System.out.println("DWT coefficients:");
for (double x : data) {
System.out.println(x);
}
}
}
```
输出结果:
```
DWT coefficients:
10.0
-1.4142135623730951
-0.585786437626905
0.0
-0.414213562373095
0.0
0.0
0.0
```