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cp_images.c
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Thu, Dec 26, 09:10

cp_images.c
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#include<stdio.h>
#include<math.h>
/* function compute difference of two images ----------- */
void cp_diffim(double **im1, double **im2, int ni, int nj, double **resim)
{
register int i, j;
for (i = 0; i < ni; i++)
for (j = 0; j < nj; j++)
resim[i][j] = (im1[i][j] - im2[i][j]);
}
/* function compute ratio of two images ----------- */
void cp_divim(double **im1, double **im2,
int ni, int nj,
double **resim, double dbz)
{
register int i, j;
for (i = 0; i < ni; i++)
for (j = 0; j < nj; j++)
if (im2[i][j] != 0.)
resim[i][j] = (im1[i][j] / im2[i][j]);
else
resim[i][j] = dbz;
}
/* function compute exponetiel of an image ----------- */
void cp_expim(double **im, int ni, int nj, double **resim)
{
register int i, j;
for (i = 0; i < ni; i++)
for (j = 0; j < nj; j++)
resim[i][j] = exp(im[i][j]);
}
/* function compute product of two images ----------- */
void cp_mulim(double **im1, double **im2,
int ni, int nj, double **resim)
{
register int i, j;
for (i = 0; i < ni; i++)
for (j = 0; j < nj; j++)
resim[i][j] = (im1[i][j] * im2[i][j]);
}
/* function compute the square of an image ----------- */
void cp_sqrim(double **im, int ni, int nj, double **resim)
{
register int i, j;
for (i = 0; i < ni; i++)
for (j = 0; j < nj; j++)
resim[i][j] = im[i][j] * im[i][j];
}
/* function compute the sum of two images ----------- */
void cp_sumim(double **im1, double **im2,
int ni, int nj,
double **resim)
{
register int i, j;
for (i = 0; i < ni; i++)
for (j = 0; j < nj; j++)
resim[i][j] = (im1[i][j] + im2[i][j]);
}
/* function threshold an image ----------- */
void cp_thim(double **im, int ni, int nj,
double min, double max,
double **resim)
{
register int i, j;
for (i = 0; i < ni; i++)
for (j = 0; j < nj; j++)
{
if (im[i][j] > max)
resim[i][j] = max;
else if (im[i][j] < min)
resim[i][j] = min;
else
resim[i][j] = max;
}
}

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