cp_errdiff.c
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	#include<stdio.h>

	/* function compute norme of (test image-image) ----------- */

	double cp_errdiff(double im1, double im2, int ni, int nj, double sigim)
	{
	register int i, j;
	double ndiff = 0;

	for (i = 0; i < ni; i++)
	for (j = 0; j < nj; j++)
	ndiff += (im1[i][j] - im2[i][j]) * (im1[i][j] - im2[i][j]);

	ndiff /= ni * nj;
	ndiff /= sigim * sigim;

	return(ndiff);
	}