how to view pdf file in asp.net using c# : Extract images pdf Library application class asp.net html web page ajax cips2ed42-part1041

F.2. CODE LISTINGS FOR CHAPTER 2
399
/***********************************************
*
*
file dumpi.c
*
*
Functions: This file contains
*
main
*
*
Purpose:
*
This file contains a program that
*
dumps the number values of an image
*
to an ascii text file.
*
*
External Calls:
*
imageio.c - get_image_size
*
read_image_array
*
allocate_image_array
*
free_image_array
*
*
Modifications:
*
1 October 1998 - created to work with
*
all I O routines in imageio.c.
*
*************************************************/
#include "cips.h"
main(argc, argv)
int argc;
char *argv[];
{
char in_name[MAX_NAME_LENGTH];
char out_name[MAX_NAME_LENGTH];
char *line, buffer[10];
int
i, j;
long height, width;
short **the_image;
FILE *out_file;
/******************************************
*
*
Ensure the command line is correct.
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400
APPENDIX F. SOURCE CODE LISTINGS
*
******************************************/
if(argc != 3){
printf("\nusage: dumpi input-image output-file");
exit(0);
}
strcpy(in_name, argv[1]);
strcpy(out_name, argv[2]);
/******************************************
*
*
Ensure the input image exists.
*
Create the output text file.
*
Allocate an image array.
*
Read the image and dump the nubmers
*
to a text file.
*
******************************************/
if(does_not_exist(in_name)){
printf("\nERROR input file %s does not exist",
in_name);
exit(0);
} /* ends if does_not_exist */
if((out_file = fopen(out_name, "wt")) == NULL){
printf("\nERROR Could not open file %s",
out_name);
exit(2);
}
get_image_size(in_name, &height, &width);
the_image = allocate_image_array(height, width);
read_image_array(in_name, the_image);
line = malloc( ((width*4)+7) * sizeof(char *));
sprintf(line, "
");
for(i=0; i<width; i++){
sprintf(buffer, "%4d", i);
strcat(line, buffer);
}
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F.3. CODE LISTINGS FOR CHAPTER 3
401
strcat(line, "\n");
fputs(line, out_file);
for(i=0; i<height; i++){
sprintf(line, "%5d>", i);
for(j=0; j<width; j++){
sprintf(buffer, "-%3d", the_image[i][j]);
strcat(line, buffer);
}
strcat(line, "\n");
fputs(line, out_file);
}
free_image_array(the_image, height);
fclose(out_file);
} /* ends main */
Listing 2.2 - The Dumpi Program
F.3 Code Listings for Chapter 3
#include "cips.h"
/*********************************************
*
*
half_tone(...
*
*
ep[m][n] = sum of erros propogated
*
to position (m,n).
*
eg[m][n] = total error generated at
*
location (m,n).
*
**********************************************/
half_tone(in_image, out_image,
threshold,
one, zero,
rows, cols)
long rows, cols;
short threshold, one, zero;
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402
APPENDIX F. SOURCE CODE LISTINGS
short **in_image, **out_image;
{
float **eg, **ep;
float c[2][3],
sum_p,
t;
int
i, j, m, n, xx, yy;
c[0][0] = 0.0;
c[0][1] = 0.2;
c[0][2] = 0.0;
c[1][0] = 0.6;
c[1][1] = 0.1;
c[1][2] = 0.1;
/***********************************************
*
*
Calculate the total propogated error
*
at location(m,n) due to prior
*
assignment.
*
*
Go through the input image. If the output
*
should be one then display that pixel as such.
*
If the output should be zero then display it
*
that way.
*
*
Also set the pixels in the input image array
*
to 1’s and 0’s in case the print option
*
was chosen.
*
************************************************/
eg = malloc(rows * sizeof(float *));
for(i=0; i<rows; i++){
eg[i] = malloc(cols * sizeof(float ));
if(eg[i] == ’\0’){
printf("\n\tmalloc of eg[%d] failed", i);
} /* ends if */
} /* ends loop over i */
ep = malloc(rows * sizeof(float *));
for(i=0; i<rows; i++){
ep[i] = malloc(cols * sizeof(float ));
if(ep[i] == ’\0’){
printf("\n\tmalloc of ep[%d] failed", i);
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F.3. CODE LISTINGS FOR CHAPTER 3
403
} /* ends if */
} /* ends loop over i */
for(i=0; i<rows; i++){
for(j=0; j<cols; j++){
eg[i][j] = 0.0;
ep[i][j] = 0.0;
}
}
/**********************************************
*
*
29 February 1988 - Fix to remove a solid
*
line at the bottom of each region. Loop
*
over ROWS-1 and then draw an extra line.
*
**********************************************/
for(m=0; m<rows; m++){
for(n=0; n<cols; n++){
sum_p = 0.0;
for(i=0; i<2; i++){
for(j=0; j<3; j++){
xx = m-i+1;
yy = n-j+1;
if(xx < 0)
xx = 0;
if(xx >= rows) xx = rows-1;
if(yy < 0)
yy = 0;
if(yy >= cols) yy = cols-1;
sum_p = sum_p + c[i][j] * eg[xx][yy];
} /* ends loop over j */
}
/* ends loop over i */
ep[m][n] = sum_p;
t = in_image[m][n] + ep[m][n];
/**********************************
*
*
Here set the point [m][n]=one
*
***********************************/
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404
APPENDIX F. SOURCE CODE LISTINGS
if(t > threshold){
eg[m][n]
= t - threshold*2;
out_image[m][n] = one;
} /* ends if t > threshold */
/**********************************
*
*
Here set the point [m][n]=zero
*
***********************************/
else{ /* t <= threshold */
eg[m][n]
= t;
out_image[m][n] = zero;
} /* ends else t <= threshold */
} /* ends loop over n columns */
}
/* ends loop over m rows */
for(i=0; i<rows; i++){
free(eg[i]);
free(ep[i]);
}
} /* ends half_tone */
Listing 3.1 - The half
tone Subroutine
/***********************************************
*
*
file halftone.c
*
*
Functions: This file contains
*
main
*
F.3. CODE LISTINGS FOR CHAPTER 3
405
*
Purpose:
*
This file contains the main calling
*
routine that performs histogram
*
equalization.
*
*
External Calls:
*
imageio.c - create_image_file
*
read_image_array
*
write_image_array
*
get_image_size
*
allocate_image_array
*
free_image_array
*
does_not_exist
*
ht.c - half_tone
*
*
Modifications:
*
30 September 1998 - created to work with
*
all I O routines in imageio.c.
*
*************************************************/
#include "cips.h"
main(argc, argv)
int argc;
char *argv[];
{
char in_name[MAX_NAME_LENGTH];
char out_name[MAX_NAME_LENGTH];
int
i;
long height, width;
short **the_image, **out_image;
short threshold;
/******************************************
*
*
Ensure the command line is correct.
*
******************************************/
if(argc != 4){
printf(
"\nusage: halftone input-image output-image threshold");
exit(0);
406
APPENDIX F. SOURCE CODE LISTINGS
}
strcpy(in_name, argv[1]);
strcpy(out_name, argv[2]);
threshold = atoi(argv[3]);
/******************************************
*
*
Ensure the input image exists.
*
Create the output image file.
*
Allocate an image array, read the input
*
image, half_tone it, and write
*
the result.
*
******************************************/
if(does_not_exist(in_name)){
printf("\nERROR input file %s does not exist",
in_name);
printf("\n
"
"usage: histeq input-image output-image");
exit(0);
} /* ends if does_not_exist */
create_image_file(in_name, out_name);
get_image_size(in_name, &height, &width);
the_image = allocate_image_array(height, width);
out_image = allocate_image_array(height, width);
read_image_array(in_name, the_image);
half_tone(the_image, out_image,
threshold, 200, 0,
height, width);
write_image_array(out_name, out_image);
free_image_array(the_image, height);
free_image_array(out_image, height);
} /* ends main */
Listing 3.2 - The main Routine for the Halftone Program
F.3. CODE LISTINGS FOR CHAPTER 3
407
/***********************************************
*
*
file dumpi.c
*
*
Functions: This file contains
*
main
*
*
Purpose:
*
This file contains a program that
*
is very similar to dumpi. Dumpi dumps
*
the number values of an image
*
to an ascii text file.
*
This program sends a space to a text
*
file for zeros in the image and an
*
asterisk for non-zeros in the image.
*
*
External Calls:
*
imageio.c - read_image_array
*
get_image_size
*
allocate_image_array
*
free_image_array
*
does_not_exist
*
*
Modifications:
*
3 October 1998 - created to work with
*
all I O routines in imageio.c.
*
*************************************************/
#include "cips.h"
main(argc, argv)
int argc;
char *argv[];
{
char in_name[MAX_NAME_LENGTH];
char out_name[MAX_NAME_LENGTH];
char *line, buffer[10];
int
i, j;
long height, width;
short **the_image;
FILE *out_file;
/******************************************
408
APPENDIX F. SOURCE CODE LISTINGS
*
*
Ensure the command line is correct.
*
******************************************/
if(argc != 3){
printf("\nusage: dumpb input-image output-file");
exit(0);
}
strcpy(in_name, argv[1]);
strcpy(out_name, argv[2]);
/******************************************
*
*
Ensure the input image exists.
*
Read the input image and dump the
*
1s and 0s to an output text file.
*
******************************************/
if(does_not_exist(in_name)){
printf("\nERROR input file %s does not exist",
in_name);
exit(0);
} /* ends if does_not_exist */
if((out_file = fopen(out_name, "wt")) == NULL){
printf("\nERROR Could not open file %s",
out_name);
exit(2);
}
get_image_size(in_name, &height, &width);
the_image = allocate_image_array(height, width);
read_image_array(in_name, the_image);
line = malloc( (width+7) * sizeof(char *));
sprintf(line, "
");
for(i=0; i<width; i++){
sprintf(buffer, "%4d", i);
strcat(line, buffer);
}
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