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F.5. CODE LISTINGS FOR CHAPTER 5
429
/* masks for sobel operator */
short sobel_mask_0[3][3] = {
{ 1, 2, 1},
{ 0, 0, 0},
{-1, -2, -1} };
short sobel_mask_1[3][3] = {
{ 2, 1, 0},
{ 1, 0, -1},
{ 0, -1, -2} };
short sobel_mask_2[3][3] = {
{ 1, 0, -1},
{ 2, 0, -2},
{ 1, 0, -1} };
short sobel_mask_3[3][3] = {
{ 0, -1, -2},
{ 1, 0, -1},
{ 2, 1, 0} };
short sobel_mask_4[3][3] = {
{-1, -2, -1},
{ 0, 0, 0},
{ 1, 2, 1} };
short sobel_mask_5[3][3] = {
{-2, -1, 0},
{-1, 0, 1},
{ 0, 1, 2} };
short sobel_mask_6[3][3] = {
{-1, 0, 1},
{-2, 0, 2},
{-1, 0, 1} };
short sobel_mask_7[3][3] = {
{ 0, 1, 2},
{-1, 0, 1},
{-2, -1, 0} };
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430
APPENDIX F. SOURCE CODE LISTINGS
/**************************************************
*
*
detect_edges(...
*
*
This function detects edges in an area of one
*
image and sends the result to another image
*
on disk. It reads the input image from disk,
*
calls a convolution function, and then writes
*
the result out to disk. If needed, it
*
allocates space on disk for the output image.
*
***************************************************/
detect_edges(the_image, out_image,
detect_type, threshold, high,
rows, cols, bits_per_pixel)
int
detect_type, high, threshold;
long
rows, cols, bits_per_pixel;
short **the_image, **out_image;
{
perform_convolution(the_image, out_image,
detect_type, threshold,
rows, cols,
bits_per_pixel,
high);
fix_edges(out_image, 1, rows, cols);
} /* ends detect_edges */
/**********************************************************
*
*
perform_convolution(...
*
*
This function performs convolution between the input
*
image and 8 3x3 masks. The result is placed in
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F.5. CODE LISTINGS FOR CHAPTER 5
431
*
the out_image.
*
********************************************************/
perform_convolution(image, out_image,
detect_type, threshold,
rows, cols, bits_per_pixel, high)
short **image,
**out_image;
int
detect_type, high, threshold;
long rows, cols, bits_per_pixel;
{
char response[80];
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(bits_per_pixel == 4){
new_hi = 10;
new_low = 3;
}
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432
APPENDIX F. SOURCE CODE LISTINGS
min = 0;
max = 255;
if(bits_per_pixel == 4)
max = 16;
/* clear output image array */
for(i=0; i<rows; i++)
for(j=0; j<cols; j++)
out_image[i][j] = 0;
printf("\n ");
for(i=1; i<rows-1; i++){
if( (i%10) == 0){ printf("%4d", i); }
for(j=1; j<cols-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];
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F.5. CODE LISTINGS FOR CHAPTER 5
433
}
}
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;
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434
APPENDIX F. SOURCE CODE LISTINGS
/* 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
F.5. CODE LISTINGS FOR CHAPTER 5
435
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<rows; i++){
for(j=0; j<cols; 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 */
436
APPENDIX F. SOURCE CODE LISTINGS
/*******************************************
*
*
quick_edge(...
*
*
This function finds edges by using
*
a single 3x3 mask.
*
*******************************************/
quick_edge(the_image, out_image,
threshold, high, rows, cols, bits_per_pixel)
int
high, threshold;
long
rows, cols, bits_per_pixel;
short **the_image, **out_image;
{
short a, b, i, j, k,
length, max, new_hi, new_low,
sum, width;
new_hi = 250;
new_low = 16;
if(bits_per_pixel == 4){
new_hi = 10;
new_low = 3;
}
max = 255;
if(bits_per_pixel == 4)
max = 16;
/* Do convolution over image array */
printf("\n");
for(i=1; i<rows-1; i++){
if( (i%10) == 0) printf("%d ", i);
for(j=1; j<cols-1; j++){
sum = 0;
for(a=-1; a<2; a++){
for(b=-1; b<2; b++){
sum = sum +
the_image[i+a][j+b] *
F.5. CODE LISTINGS FOR CHAPTER 5
437
quick_mask[a+1][b+1];
}
}
if(sum < 0)
sum = 0;
if(sum > max) sum = max;
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<rows; i++){
for(j=0; j<cols; j++){
if(out_image[i][j] > high){
out_image[i][j] = new_hi;
}
else{
out_image[i][j] = new_low;
}
}
}
} /* ends if threshold == 1 */
fix_edges(out_image, 1,
rows-1, cols-1);
} /* ends quick_edge */
/***********************************************
*
*
setup_masks(...
*
*
This function copies the mask values defined
*
at the top of this file into the mask
*
arrays mask_0 through mask_7.
*
***********************************************/
438
APPENDIX F. SOURCE CODE LISTINGS
setup_masks(detect_type, mask_0, mask_1, mask_2, mask_3,
mask_4, mask_5, mask_6, mask_7)
int
detect_type;
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];
{
int i, j;
if(detect_type == KIRSCH){
for(i=0; i<3; i++){
for(j=0; j<3; j++){
mask_0[i][j] = kirsch_mask_0[i][j];
mask_1[i][j] = kirsch_mask_1[i][j];
mask_2[i][j] = kirsch_mask_2[i][j];
mask_3[i][j] = kirsch_mask_3[i][j];
mask_4[i][j] = kirsch_mask_4[i][j];
mask_5[i][j] = kirsch_mask_5[i][j];
mask_6[i][j] = kirsch_mask_6[i][j];
mask_7[i][j] = kirsch_mask_7[i][j];
}
}
} /* ends if detect_type == KIRSCH */
if(detect_type == PREWITT){
for(i=0; i<3; i++){
for(j=0; j<3; j++){
mask_0[i][j] = prewitt_mask_0[i][j];
mask_1[i][j] = prewitt_mask_1[i][j];
mask_2[i][j] = prewitt_mask_2[i][j];
mask_3[i][j] = prewitt_mask_3[i][j];
mask_4[i][j] = prewitt_mask_4[i][j];
mask_5[i][j] = prewitt_mask_5[i][j];
mask_6[i][j] = prewitt_mask_6[i][j];
mask_7[i][j] = prewitt_mask_7[i][j];
}
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