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| #include <stdio.h>
#include <stdlib.h>
int Haar(int *, int , int *, int *);
int UnHaar(int *, int , int *, int *);
void HaarStep(int *, int, int *, int *);
void UnHaarStep(int *, int , int *, int *);
void HaarStep(int *X, int n2, int *s, int *d)
{
int k;
for( k = 0 ; k < n2 ; k++, X +=2)
{
d[k] = X[1] - X[0];
s[k] = X[0] + d[k] / 2;
}
}
int Haar(int *X, int n, int *s, int *d)
{
int steps;
for( steps = 0 ; n > 1 ; steps++)
{
n /= 2;
HaarStep(X, n, s, d);
}
return steps;
}
void UnHaarStep(int *X, int n2, int *s, int *d)
{
int k;
for( k = 0 ; k < n2 ; k++, X +=2)
{
X[0] = s[k] - d[k] / 2;
X[1] = X[0] + d[k];
}
}
int UnHaar(int *X, int n, int *s, int *d)
{
int steps, n2 = 1;
for( steps = 0 ; n2 < n ; steps++)
{
UnHaarStep(X, n2, s, d);
n2 *= 2;
}
return steps;
}
int signal[80];
int detail[80];
int smooth[80];
int main(int argc, char **argv )
{
int i, n;
for( i = 1, n = 0 ; i < argc ; i++, n++)
{
signal[n] = atoi( argv[i] );
}
printf("Initial signal : \n\n");
for( i= 0; i < n ; i++)
{
printf("\tsignal[%d] = %d \n", i, signal[i] );
}
printf("\n\nHaar Transform : %d steps \n\n", Haar(signal, n, smooth, detail) );
for( i= 0; i < n/2 ; i++)
{
printf("\tsmooth[%d] = %d detail[%d] = %d \n", i, smooth[i], i, detail[i] );
}
printf("\n\nReconstructed signal : %d steps \n\n", UnHaar(signal, n, smooth, detail) );
for( i= 0; i < n ; i++)
{
printf("\tsignal[%d] = %d \n", i, signal[i] );
}
return 0;
} |
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