Code:
/* =======================================
*
* IMAGE FORMAT DEFINITIONS
*
* Dr. Xue Dong Yang
* =======================================
*/
#include <stdio.h>
#include <math.h>
#ifndef ROWS
#define ROWS 256
#endif
#ifndef COLS
#define COLS 256
#endif
unsigned char in_img[ROWS][COLS]; /* Input raw raster image */
unsigned char out_img[ROWS][COLS]; /* Output raster image */
typedef struct complex {
float r,i; /* Real and imaginery parts */
} COMPLEX;
COMPLEX F[ROWS][COLS]; /* Arrays used FFT computation */
COMPLEX F1[ROWS][COLS];
COMPLEX TF[COLS];
/* Some functions for complex arithmetics */
COMPLEX complex_plus(c1, c2)
COMPLEX c1, c2;
{
COMPLEX c;
c.r = c1.r + c2.r;
c.i = c1.i + c2.i;
return( c );
}
COMPLEX complex_minus(c1, c2)
COMPLEX c1, c2;
{
COMPLEX c;
c.r = c1.r - c2.r;
c.i = c1.i - c2.i;
return( c );
}
COMPLEX complex_times(c1, c2)
COMPLEX c1, c2;
{
COMPLEX c;
c.r = c1.r*c2.r - c1.i*c2.i;
c.i = c1.r*c2.i + c2.r*c1.i;
return( c );
}
int complex_print(COMPLEX c) {
printf("[%f,%f]", c.r, c.i);
return (1);
}
double complex_mag(COMPLEX c) {
return (sqrt(pow(c.r,2) + pow(c.i,2)));
}
