/*****************************************************
* 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(in_name, out_name, the_image, out_image,
il, ie, ll, value, threshold)
char in_name[], out_name[];
int il, ie, ll, le;
short the_image[ROWS][COLS],
out_image[ROWS][COLS],
threshold, value;
{
int a, b, count, i, j, k;
int length, width;
struct tiff_header_struct image_header;
if(does_not_exist(out_name)){
printf{"n\n output file does not exist %s", out_name);
read_tiff_header(in_name, &image_header};
round_off_image_size(&image_header, &length, &width);
image_header.image_length = length*ROWS;
image_header.image_width = width*COLS;
create_allocate_tiff_file(out_name, &image_header, out_image);
} /* ends if does_not_exist */
read_tiff_image(in_name, the_image, il, ie, ll, le);
/***************************
* 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<=l; b++){
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);
write_array_into_tiff_image(out_name, out_image, il, ie, ll, le);
} /* ends erosion */
/*******************************************************
* 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(in_name, out_name, the_image, out_image,
il, ie, ll, le, value, threshold)
char in_name[], out_name[];
int il, ie, ll, le;
short the_image[ROWS][COLS],
out_image[ROWS][COLS],
threshold, value;
{
int a, b, count, i, j, k;
int length, width;
struct tiff_header_struct image_header;
if(does_not_exist(outname)){
printf("\n\n output file does not exist %s", out_name);
read_tiff_header(in_name, &image_header);
round_off_image_size(&image_header, &length, &width);
image_header.image_length = length*ROWS;
image_header.image_width = width*COLS;
create_allocate_tiff_file(out_name, &image_header, out_image);
} /* ends if does_not_exist */
read_tiff_image(in_name, the_image, il, ie, ll, le);
/************************
* 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++){
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++;
} /* 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, 3);
write_array_into_tiff_image(out_name, out_image, il, ie, ll, le);
} /* ends dilation */
/* End of File */