SWT2 Example Code

SWT2/ISWT2 Example

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include "../header/wavelib.h"

double absmax(double *array, int N) {
	double max;
	int i;

	max = 0.0;
	for (i = 0; i < N; ++i) {
		if (fabs(array[i]) >= max) {
			max = fabs(array[i]);
		}
	}

	return max;
}

double generate_rnd() {
	double rnd;

	rnd = (double) (rand() % 100 + 1);

	return rnd;
}

int main() {
	wave_object obj;
	wt2_object wt;
	int i, k, J, rows, cols;
	double *inp, *wavecoeffs, *oup, *cLL,*diff;
	double amax;
	int ir, ic, N;
	rows = 64;
	cols = 48;

	char *name = "bior3.1";
	obj = wave_init(name);// Initialize the wavelet
	N = rows*cols;
	inp = (double*)calloc(N, sizeof(double));
	oup = (double*)calloc(N, sizeof(double));
	diff = (double*)calloc(N, sizeof(double));
	J = 2;

	wt = wt2_init(obj, "swt", rows, cols, J);

	for (i = 0; i < rows; ++i) {
		for (k = 0; k < cols; ++k) {
			//inp[i*cols + k] = i*cols + k;
            inp[i*cols + k] = generate_rnd();
			oup[i*cols + k] = 0.0;
		}
	}
	
	wavecoeffs = swt2(wt, inp);

	cLL = getWT2Coeffs(wt, wavecoeffs, J, "A", &ir, &ic);

	dispWT2Coeffs(cLL, ir, ic);
	
	iswt2(wt, wavecoeffs, oup);

	for (i = 0; i < N; ++i) {
		diff[i] = oup[i] - inp[i];
	}

	amax = absmax(diff, N);

	wt2_summary(wt);

	printf("Abs Max %g \n", amax);
	
	wave_free(obj);
	wt2_free(wt);
	free(inp);
	free(wavecoeffs);
	free(oup);
	free(diff);
        return 0;
}