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F.11. CODE LISTINGS FOR CHAPTER 11
539
short edmask1[3][3] = {{0, 1, 0},
{0, 1, 0},
{0, 1, 0}};
short edmask2[3][3] = {{0, 0, 0},
{1, 1, 1},
{0, 0, 0}};
short edmask3[3][3] = {{0, 1, 0},
{1, 1, 1},
{0, 1, 0}};
short edmask4[3][3] = {{1, 1, 1},
{1, 1, 1},
{1, 1, 1}};
/*******************************************
*
*
erosion(...
*
*
This function performs the erosion
*
operation. If a value pixel has more
*
than the threshold number of 0
*
neighbors, you erode it by setting it
*
to 0.
*
*******************************************/
erosion(the_image, out_image,
value, threshold,
rows, cols)
int
threshold;
short **the_image,
**out_image,
value;
long
cols, rows;
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540
APPENDIX F. SOURCE CODE LISTINGS
{
int
a, b, count, i, j, k;
/***************************
*
*
Loop over image array
*
****************************/
for(i=0; i<rows; i++)
for(j=0; j<cols; j++)
out_image[i][j] = the_image[i][j];
printf("\n");
for(i=1; i<rows-1; i++){
if( (i%10) == 0) printf("%3d", i);
for(j=1; j<cols-1; j++){
if(the_image[i][j] == value){
count = 0;
for(a=-1; a<=1; a++){
for(b=-1; b<=1; b++){
if( (i+a) >= 0){
if(the_image[i+a][j+b] == 0)
count++;
}
} /* ends loop over b */
} /* ends loop over a */
if(count > threshold){ out_image[i][j] = 0;
}
} /* ends if the_image == value */
} /* ends loop over j */
} /* ends loop over i */
/*****
fix_edges(out_image, 3, rows, cols);
***/
} /* ends erosion */
/*******************************************
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F.11. CODE LISTINGS FOR CHAPTER 11
541
*
*
dilation(...
*
*
This function performs the dilation
*
operation. If a 0 pixel has more than
*
threshold number of value neighbors,
*
you dilate it by setting it to value.
*
*******************************************/
dilation(the_image, out_image,
value, threshold,
rows, cols)
int
threshold;
short **the_image,
**out_image,
value;
long
cols, rows;
{
int
a, b, count, i, j, k;
int
three = 3;
/***************************
*
*
Loop over image array
*
****************************/
for(i=0; i<rows; i++)
for(j=0; j<cols; j++)
out_image[i][j] = the_image[i][j];
printf("\n");
for(i=1; i<rows-1; i++){
if( (i%10) == 0) printf("%3d", i);
for(j=1; j<cols-1; j++){
out_image[i][j] = the_image[i][j];
if(the_image[i][j] == 0){
count = 0;
for(a=-1; a<=1; a++){
for(b=-1; b<=1; b++){
if(a!=0 && b!=0){
if(the_image[i+a][j+b] == value)
count++;
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542
APPENDIX F. SOURCE CODE LISTINGS
} /* ends avoid the center pixel */
} /* ends loop over b */
} /* ends loop over a */
if(count > threshold)
out_image[i][j] = value;
} /* ends if the_image == 0 */
} /* ends loop over j */
} /* ends loop over i */
/*****
fix_edges(out_image, three, rows, cols);
***/
} /* ends dilation */
/*******************************************
*
*
mask_dilation(...
*
*
This function performs the dilation
*
operation using the erosion-dilation
*
3x3 masks given above. It works on
*
0-value images.
*
*******************************************/
mask_dilation(the_image, out_image,
value, mask_type,
rows, cols)
int
mask_type;
short **the_image,
**out_image,
value;
long
cols, rows;
{
int
a, b, count, i, j, k;
short mask[3][3], max;
/**************************************
*
*
Copy the 3x3 erosion-dilation mask
*
specified by the mask_type.
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F.11. CODE LISTINGS FOR CHAPTER 11
543
*
***************************************/
switch(mask_type){
case 1:
copy_3_x_3(mask, edmask1);
break;
case 2:
copy_3_x_3(mask, edmask2);
break;
case 3:
copy_3_x_3(mask, edmask3);
break;
case 4:
copy_3_x_3(mask, edmask4);
break;
default:
printf("\nInvalid mask type, using mask 4");
copy_3_x_3(mask, edmask4);
break;
}
/***************************
*
*
Loop over image array
*
****************************/
printf("\n");
for(i=1; i<rows-1; i++){
if( (i%10) == 0) printf("%3d", i);
for(j=1; j<cols-1; j++){
max = 0;
for(a=-1; a<=1; a++){
for(b=-1; b<=1; b++){
if(mask[a+1][b+1] == 1){
if(the_image[i+a][j+b] > max)
max = the_image[i+a][j+b];
} /* ends if mask == 1 */
} /* ends loop over b */
} /* ends loop over a */
out_image[i][j] = max;
} /* ends loop over j */
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544
APPENDIX F. SOURCE CODE LISTINGS
} /* ends loop over i */
/*****
fix_edges(out_image, 3, rows, cols);
***/
} /* ends mask_dilation */
/*******************************************
*
*
mask_erosion(...
*
*
This function performs the erosion
*
operation using the erosion-dilation
*
3x3 masks given above. It works on
*
0-value images.
*
*******************************************/
mask_erosion(the_image, out_image,
value, mask_type,
rows, cols)
int
mask_type;
short **the_image,
**out_image,
value;
long
cols, rows;
{
int
a, b, count, i, j, k;
short mask[3][3], min;
/**************************************
*
*
Copy the 3x3 erosion-dilation mask
*
specified by the mask_type.
*
***************************************/
switch(mask_type){
case 1:
copy_3_x_3(mask, edmask1);
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F.11. CODE LISTINGS FOR CHAPTER 11
545
break;
case 2:
copy_3_x_3(mask, edmask2);
break;
case 3:
copy_3_x_3(mask, edmask3);
break;
case 4:
copy_3_x_3(mask, edmask4);
break;
default:
printf("\nInvalid mask type, using mask 4");
copy_3_x_3(mask, edmask4);
break;
}
/***************************
*
*
Loop over image array
*
****************************/
printf("\n");
for(i=1; i<rows-1; i++){
if( (i%10) == 0) printf("%3d", i);
for(j=1; j<cols-1; j++){
min = value;
for(a=-1; a<=1; a++){
for(b=-1; b<=1; b++){
if(mask[a+1][b+1] == 1){
if(the_image[i+a][j+b] < min)
min = the_image[i+a][j+b];
} /* ends if mask == 1 */
} /* ends loop over b */
} /* ends loop over a */
out_image[i][j] = min;
} /* ends loop over j */
} /* ends loop over i */
/*****
fix_edges(out_image, 3, rows, cols);
***/
546
APPENDIX F. SOURCE CODE LISTINGS
} /* ends mask_erosion */
/***********************************************
*
*
copy_3_x_3(a, b)
*
*
This function copies a 3x3 array of shorts
*
from one array to another. It copies array
*
b into array a.
*
***********************************************/
copy_3_x_3(a, b)
short a[3][3], b[3][3];
{
int i, j;
for(i=0; i<3; i++)
for(j=0; j<3; j++)
a[i][j] = b[i][j];
} /* ends copy_3_x_3 */
/*******************************************
*
*
opening(...
*
*
Opening is erosion followed by dilation.
*
This routine will use the mask erosion
*
and dilation. You could use the other
*
types and you could mix the two types.
*
*
The number parameter specifies how
*
erosions to perform before doing one
*
dilation.
*
*******************************************/
opening(the_image, out_image,
value, mask_type, number,
rows, cols)
int
number;
F.11. CODE LISTINGS FOR CHAPTER 11
547
int
mask_type;
short **the_image,
**out_image,
value;
long
cols, rows;
{
int
a, b, count, i, j, k;
short mask[3][3], max;
/**************************************
*
*
Copy the 3x3 erosion-dilation mask
*
specified by the mask_type.
*
***************************************/
switch(mask_type){
case 1:
copy_3_x_3(mask, edmask1);
break;
case 2:
copy_3_x_3(mask, edmask2);
break;
case 3:
copy_3_x_3(mask, edmask3);
break;
case 4:
copy_3_x_3(mask, edmask4);
break;
default:
printf("\nInvalid mask type, using mask 4");
copy_3_x_3(mask, edmask4);
break;
}
for(i=0; i<rows; i++)
for(j=0; j<cols; j++)
out_image[i][j] = the_image[i][j];
mask_erosion(the_image, out_image,
value, mask_type,
rows, cols);
if(number > 1){
count = 1;
548
APPENDIX F. SOURCE CODE LISTINGS
while(count < number){
count++;
mask_erosion(the_image, out_image,
value, mask_type,
rows, cols);
} /* ends while */
} /* ends if number > 1 */
mask_dilation(the_image,
out_image,
value, mask_type,
rows, cols);
} /* ends opening */
/*******************************************
*
*
closing(...
*
*
Closing is dilation followed by erosion.
*
This routine will use the mask erosion
*
and dilation. You could use the other
*
types and you could mix the two types.
*
*
The number parameter specifies how
*
dilations to perform before doing one
*
erosion.
*
*******************************************/
closing(the_image, out_image,
value, mask_type, number,
rows, cols)
int
number;
int
mask_type;
short **the_image,
**out_image,
value;
long
cols, rows;
{
int
a, b, count, i, j, k;
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