how to view pdf file in asp.net using c# : How to extract images from pdf files software SDK cloud windows wpf azure class cips2ed47-part1046

F.6. CODE LISTINGS FOR CHAPTER 6
449
out_image[i][j] = sum_n/d;
if(out_image[i][j] > max)
out_image[i][j] = max;
if(out_image[i][j] < 0)
out_image[i][j] = 0;
} /* 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 contrast_edge */
/*******************************************
*
*
range(..
*
*
This edge detector performs the
*
range operation.
*
It replaces the pixel at the center of a
*
3x3, 5x5, etc. area with the max - min
*
for that area.
*
*******************************************/
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450
APPENDIX F. SOURCE CODE LISTINGS
range(the_image, out_image,
rows, cols, bits_per_pixel,
size, threshold, high)
int
high, threshold, size;
short **the_image,
**out_image;
long
rows, cols, bits_per_pixel;
{
int
a, b, count, i, j, k,
new_hi, new_low, length,
sd2, sd2p1, ss, width;
short *elements;
sd2
= size/2;
sd2p1 = sd2 + 1;
/**********************************************
*
*
Allocate the elements array large enough
*
to hold size*size shorts.
*
**********************************************/
ss
= size*size;
elements = (short *) malloc(ss * sizeof(short));
new_hi = 250;
new_low = 16;
if(bits_per_pixel == 4){
new_hi = 10;
new_low = 3;
}
/***************************
*
*
Loop over image array
*
****************************/
printf("\n");
for(i=sd2; i<rows-sd2; i++){
if( (i%10) == 0) printf("%4d ", i);
for(j=sd2; j<cols-sd2; j++){
count = 0;
for(a=-sd2; a<sd2p1; a++){
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F.6. CODE LISTINGS FOR CHAPTER 6
451
for(b=-sd2; b<sd2p1; b++){
elements[count] = the_image[i+a][j+b];
count++;
}
}
sort_elements(elements, &ss);
out_image[i][j] = elements[ss-1]-elements[0];
} /* 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 */
free(elements);
} /* ends range */
/**************************************************
*
*
variance(...
*
*
This function replaces the pixel in the center
*
of a 3x3 area with the square root of the sum
*
of squares of the differences between the
*
center pixel and its eight neighbors.
*
***************************************************/
variance(the_image, out_image,
rows, cols, bits_per_pixel,
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452
APPENDIX F. SOURCE CODE LISTINGS
threshold, high)
int
high, threshold;
short **the_image,
**out_image;
long
rows, cols, bits_per_pixel;
{
int
a, b, i, j, length,
max, new_hi, new_low, width;
long
diff;
unsigned long sum, tmp;
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;
for(i=1; i<rows-1; i++){
if( (i%10) == 0) printf("%4d", i);
for(j=1; j<cols-1; j++){
sum = 0;
for(a=-1; a<=1; a++){
for(b=-1; b<=1; b++){
if( a!=0 && b!=0){
diff = 0;
diff = the_image[i][j] -
the_image[i+a][j+b];
tmp = diff*diff;
sum = sum + tmp;
}
}
}
if(sum < 0)
printf("\nWHAT? sum < 0, %ld ,diff=%d ", sum, diff);
sum = sqrt(sum);
if(sum > max) sum = max;
out_image[i][j] = sum;
} /* ends loop over j */
} /* ends loop over i */
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F.6. CODE LISTINGS FOR CHAPTER 6
453
/* 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 variance */
/*******************************************
*
* enhance_edges(...
*
* This function enhances the edges in an
* input image and writes the enhanced
* result to an output image. It operates
* much the same way as detect_edges
* except it uses only one type of mask.
*
* The threshold and high parameters perform
* a different role in this function. The
* threshold parameter does not exist. The
* high parameter determines if the edge is
* strong enough to enhance or change the
* input image.
*
*******************************************/
enhance_edges(the_image, out_image,
rows, cols, bits_per_pixel, high)
int
high;
short **the_image,
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454
APPENDIX F. SOURCE CODE LISTINGS
**out_image;
long
rows, cols, bits_per_pixel;
{
int
a, b, i, j, k,
length, max, new_hi,
new_lo, sum, width;
max = 255;
if(bits_per_pixel == 4)
max = 16;
/* Do convolution over image array */
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] *
enhance_mask[a+1][b+1];
}
}
if(sum < 0)
sum = 0;
if(sum > max) sum = max;
if(sum > high)
out_image[i][j] = max;
else
out_image[i][j] = the_image[i][j];
} /* ends loop over j */
} /* ends loop over i */
} /* ends enhance_edges */
Listing 6.1 - Edge Detectors
/***********************************************
*
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F.6. CODE LISTINGS FOR CHAPTER 6
455
*
file medge.c
*
*
Functions: This file contains
*
main
*
*
Purpose:
*
This file contains the main calling
*
routine that performs edge
*
detection.
*
*
External Calls:
*
imageio.c - create_image_file
*
read_image_array
*
write_image_array
*
get_image_size
*
allocate_image_array
*
free_image_array
*
edge.c -
*
detect_edges
*
setup_masks
*
get_edge_options
*
perform_convolution
*
quick_edge
*
edge2.c -
*
homogeneity
*
difference_edge
*
contrast_edge
*
range
*
variance
*
edge3.c -
*
gaussian_edge
*
enhance_edges
*
*
Modifications:
*
18 September 1998 - created to work with
*
all I O routines in imageio.c.
*
*************************************************/
#include "cips.h"
main(argc, argv)
456
APPENDIX F. SOURCE CODE LISTINGS
int argc;
char *argv[];
{
char image_name[MAX_NAME_LENGTH];
char image_name2[MAX_NAME_LENGTH];
char response[MAX_NAME_LENGTH];
int
i, j;
int
high, size, threshold, type;
long bits_per_pixel, height, width;
short **the_image, **out_image;
struct
tiff_header_struct image_header;
/******************************************
*
*
Ensure the command line is correct.
*
******************************************/
if(argc < 4
|| argc > 7){
show_edge_usage();
exit(0);
}
strcpy(image_name, argv[2]);
strcpy(image_name2, argv[3]);
if(does_not_exist(image_name)){
printf("\nERROR input file %s does not exist",
image_name);
exit(0);
}
create_image_file(image_name, image_name2);
get_image_size(image_name, &height, &width);
get_bitsperpixel(image_name, &bits_per_pixel);
the_image = allocate_image_array(height, width);
out_image = allocate_image_array(height, width);
read_image_array(image_name, the_image);
if(argv[1][0] == ’q’ || argv[1][0] == ’Q’){
threshold = atoi(argv[4]);
high
= atoi(argv[5]);
quick_edge(the_image, out_image,
threshold, high,
F.6. CODE LISTINGS FOR CHAPTER 6
457
height, width,
bits_per_pixel);
} /* ends if q */
if(argv[1][0] == ’b’ || argv[1][0] == ’B’){
threshold = atoi(argv[4]);
high
= atoi(argv[5]);
type
= atoi(argv[6]);
perform_convolution(
the_image, out_image,
type, threshold,
height, width,
bits_per_pixel, high);
} /* ends if b */
if(argv[1][0] == ’h’ || argv[1][0] == ’H’){
threshold = atoi(argv[4]);
high
= atoi(argv[5]);
homogeneity(the_image, out_image,
height, width,
bits_per_pixel,
threshold, high);
} /* ends if h */
if(argv[1][0] == ’d’ || argv[1][0] == ’D’){
threshold = atoi(argv[4]);
high
= atoi(argv[5]);
difference_edge(the_image, out_image,
height, width,
bits_per_pixel,
threshold, high);
} /* ends if d */
if(argv[1][0] == ’c’ || argv[1][0] == ’C’){
threshold = atoi(argv[4]);
high
= atoi(argv[5]);
contrast_edge(the_image, out_image,
height, width,
bits_per_pixel,
threshold, high);
} /* ends if c */
if(argv[1][0] == ’r’ || argv[1][0] == ’R’){
threshold = atoi(argv[4]);
high
= atoi(argv[5]);
458
APPENDIX F. SOURCE CODE LISTINGS
size
= atoi(argv[6]);
range(the_image, out_image,
height, width,
bits_per_pixel,
size, threshold, high);
} /* ends if r */
if(argv[1][0] == ’v’ || argv[1][0] == ’V’){
threshold = atoi(argv[4]);
high
= atoi(argv[5]);
variance(the_image, out_image,
height, width,
bits_per_pixel,
threshold, high);
} /* ends if v */
if(argv[1][0] == ’g’ || argv[1][0] == ’G’){
threshold = atoi(argv[4]);
high
= atoi(argv[5]);
size
= atoi(argv[6]);
gaussian_edge(the_image, out_image,
height, width,
bits_per_pixel,
size, threshold, high);
} /* ends if g */
if(argv[1][0] == ’q’ || argv[1][0] == ’Q’){
high
= atoi(argv[4]);
enhance_edges(the_image, out_image,
height, width,
bits_per_pixel, high);
} /* ends if q */
write_image_array(image_name2, out_image);
free_image_array(the_image, height);
free_image_array(out_image, height);
} /* ends main */
show_edge_usage()
{
printf("\nusage of medge"
"\n Quick edge detector"
"\nmedge Q in-file out-file threshold (1/0) high"
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