gaussian_noise_reduce.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include "tools.h"

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Functions
void	gaussian_noise_reduce (int w, int h, float img_in[w *h], float img_out[w *h])
int	main (int argc, char **argv)

Function Documentation

gaussian_noise_reduce()

void gaussian_noise_reduce	(	int	w,
		int	h,
		float	img_in[w *h],
		float	img_out[w *h]
	)

Definition at line 12 of file gaussian_noise_reduce.c.

{
    int  x, y, max_x, max_y;
    max_x = w - 2;
    max_y = w * (h - 2);
    for (y = w * 2; y < max_y; y += w) {
        for (x = 2; x < max_x; x++) {
            img_out[x + y] = (2 * img_in[x + y - 2 - w - w] + 
                    4 * img_in[x + y - 1 - w - w] + 
                    5 * img_in[x + y - w - w] + 
                    4 * img_in[x + y + 1 - w - w] + 
                    2 * img_in[x + y + 2 - w - w] + 
                    4 * img_in[x + y - 2 - w] + 
                    9 * img_in[x + y - 1 - w] + 
                    12 * img_in[x + y - w] + 
                    9 * img_in[x + y + 1 - w] + 
                    4 * img_in[x + y + 2 - w] + 
                    5 * img_in[x + y - 2] + 
                    12 * img_in[x + y - 1] + 
                    15 * img_in[x + y] + 
                    12 * img_in[x + y + 1] + 
                    5 * img_in[x + y + 2] + 
                    4 * img_in[x + y - 2 + w] + 
                    9 * img_in[x + y - 1 + w] + 
                    12 * img_in[x + y + w] + 
                    9 * img_in[x + y + 1 + w] + 
                    4 * img_in[x + y + 2 + w] + 
                    2 * img_in[x + y - 2 + w + w] + 
                    4 * img_in[x + y - 1 + w + w] + 
                    5 * img_in[x + y + w + w] + 
                    4 * img_in[x + y + 1 + w + w] + 
                    2 * img_in[x + y + 2 + w + w]) / 159;
        }
    }
}

References x.

Referenced by main().

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main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 48 of file gaussian_noise_reduce.c.

                                {
    int n;
    float (*in)[n*n], (*out)[n*n];
    int i;
    if (argc < 3)
    {
            fprintf(stderr, "Usage: %s size data_file\n", argv[0]);
            return 1;
    }
    n = atoi(argv[1]);
    in=malloc(n*n);
    out=malloc(n*n);
    init_data_file(argv[2]);
    init_data_float(in, n*n);
    close_data_file();
    for(i=0;i<n*n;i++) {
        (*out)[i]=0;
    }
    gaussian_noise_reduce(n,n,*in,*out);
    print_array_float(out, n*n);
    free(in);free(out);
    return 0;
}

References close_data_file(), fprintf(), free(), gaussian_noise_reduce(), init_data_file(), init_data_float(), malloc(), out, and print_array_float().

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