Category : Files from Magazines
Archive   : CUJ9306.ZIP
Filename : 1106079A

 
Output of file : 1106079A contained in archive : CUJ9306.ZIP
/***********************************************
*
* perform_convolution(...
*
* This function performs convolution
* between the input image and 8 3x3 masks.
* The result is placed in the out_image.
*
************************************************/

perform_convolution(image, out_image,
detect_type, threshold,
image_header, high)
short image[ROWS][COLS],
out_image[ROWS][COLS];
int detect_type, high, threshold;
struct tiff_header_struct *image_header;
{

int a,
b,
i,
is_present,
j,
sum;

short mask_0[3][3],
mask_1[3][3],
mask_2[3][3],
mask_3[3][3],
mask_4[3][3],
mask_5[3][3],
mask_6[3][3],
mask_7[3][3],
max,
min,
new_hi,
new_low;


setup_masks(detect_type, mask_0, mask_1,
mask_2, mask_3, mask_4, mask_5,
mask_6, mask_7);

new_hi = 250;
new_low = 16;
if(image_header->bits_per_pixel == 4){
new_hi = 10;
new_low = 3;
}

min = 0;
max = 255;
if(image_header->bits_per_pixel == 4)
max = 16;

/* clear output image array */
for(i=0; i for(j=0; j out_image[i][j] = 0;

printf("\n ");

for(i=1; i if( (i%10) == 0) printf("%3d", i);
for(j=1; j

/* Convolve for all 8 directions */

/* 0 direction */

sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum + image[i+a][j+b] *
mask_0[a+1][b+1];
}
}
if(sum > max) sum = max;
if(sum < 0) sum = 0;
/* Correction 12-27-92
see file header for
details. */
/**/
/**/
/**/
if(sum > out_image[i][j]) /**************/
out_image[i][j] = sum; /**************/
/**/
/**/
/**/

/* 1 direction */

sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum + image[i+a][j+b] * mask_1[a+1][b+1];
}
}
if(sum > max) sum = max;
if(sum < 0) sum = 0;
/* Correction 12-27-92
see file header for
details. */
if(sum > out_image[i][j])
out_image[i][j] = sum;


/* 2 direction */

sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum + image[i+a][j+b] * mask_2[a+1][b+1];
}
}
if(sum > max) sum = max;
if(sum < 0) sum = 0;
/* Correction 12-27-92
see file header for
details. */
if(sum > out_image[i][j])
out_image[i][j] = sum;


/* 3 direction */

sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum + image[i+a][j+b] * mask_3[a+1][b+1];
}
}
if(sum > max) sum = max;
if(sum < 0) sum = 0;
/* Correction 12-27-92
see file header for
details. */
if(sum > out_image[i][j])
out_image[i][j] = sum;


/* 4 direction */

sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum + image[i+a][j+b] * mask_4[a+1][b+1];
}
}
if(sum > max) sum = max;
if(sum < 0) sum = 0;
/* Correction 12-27-92
see file header for
details. */
if(sum > out_image[i][j])
out_image[i][j] = sum;


/* 5 direction */

sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum + image[i+a][j+b] * mask_5[a+1][b+1];
}
}
if(sum > max) sum = max;
if(sum < 0) sum = 0;
/* Correction 12-27-92
see file header for
details. */
if(sum > out_image[i][j])
out_image[i][j] = sum;


/* 6 direction */
sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum + image[i+a][j+b] * mask_6[a+1][b+1];
}
}
if(sum > max) sum = max;
if(sum < 0) sum = 0;
/* Correction 12-27-92
see file header for
details. */
if(sum > out_image[i][j])
out_image[i][j] = sum;


/* 7 direction */

sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum + image[i+a][j+b] * mask_7[a+1][b+1];
}
}
if(sum > max) sum = max;
if(sum < 0) sum = 0;
/* Correction 12-27-92
see file header for
details. */
if(sum > out_image[i][j])
out_image[i][j] = sum;


} /* ends loop over j */
} /* ends loop over i */


/* if desired, threshold the output image */
if(threshold == 1){
for(i=0; i for(j=0; j if(out_image[i][j] > high){
out_image[i][j] = new_hi;
}
else{
out_image[i][j] = new_low;
}
}
}
} /* ends if threshold == 1 */

} /* ends perform_convolution */



  3 Responses to “Category : Files from Magazines
Archive   : CUJ9306.ZIP
Filename : 1106079A

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