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F.16. CODE LISTINGS FOR CHAPTER 16
699
} /* ends loop over j */
}
/* ends loop over i */
write_image_array(pp_file_name, processed_pattern);
for(i=0; i<length; i++)
random_substitution(processed_pattern[i], width);
write_image_array(s_file_name, processed_pattern);
free_image_array(depth_image, length);
free_image_array(pattern, length);
free_image_array(processed_pattern, length);
return(111);
} /* ends main
*/
/***********************************************
*
*
shorten_pattern(...
*
*
This funtion shortens the pattern by
*
deleting an element from it. For example,
*
if the input pattern is abcdefg,
*
the output pattern could be abcfg.
*
***********************************************/
void shorten_pattern(size, pattern, index,
current_width, width)
short *pattern;
int
size, *index, *current_width, width;
{
short *temp_pattern;
int
i, new_index, new_width;
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700
APPENDIX F. SOURCE CODE LISTINGS
temp_pattern = malloc(width*sizeof(short));
for(i=0; i<width; i++)
temp_pattern[i] = pattern[i];
zero_line(pattern, width);
new_index = 0;
new_width = *current_width - size;
/*********************************************
*
*
Increase the index by the amount we want
*
to shorten the pattern.
Then copy the
*
temp_pattern back to the pattern skipping
*
over parts of the pattern by the amount
*
we want to shorten it.
*
*********************************************/
*index = (*index + size) % (*current_width);
for(new_index=0; new_index<new_width; new_index++){
pattern[new_index] = temp_pattern[*index];
*index = *index + 1;
if(*index >= *current_width)
*index = 0;
} /* ends loop over new_index */
*current_width = new_width;
*index
= 0;
free(temp_pattern);
} /* ends shorten_pattern */
/***********************************************
*
*
initialize_pattern(...
*
*
This function creates an initial pattern
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F.16. CODE LISTINGS FOR CHAPTER 16
701
*
that is as wide as the pattern_width
*
parameter.
*
***********************************************/
void initialize_pattern(pattern, current_width,
max_width, pattern_width,
index)
short *pattern;
int
*current_width,
*max_width,
*index,
pattern_width;
{
int i;
for(i=0; i<pattern_width; i++)
pattern[i] = i+PATTERN_START;
*index
= 0;
*current_width = pattern_width;
*max_width
= pattern_width;
} /* ends initialize_pattern */
/***********************************************
*
*
no_change(...
*
*
This function processes the pattern
*
and does not make any changes to it.
*
***********************************************/
void no_change(pattern, processed_pattern, pp_index,
current_width, index)
short *pattern, *processed_pattern;
int
pp_index, current_width, *index;
{
processed_pattern[pp_index] =
pattern[*index];
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702
APPENDIX F. SOURCE CODE LISTINGS
*index = *index + 1;
if(*index >= current_width)
*index = 0;
}
/* ends no_change */
/***********************************************
*
*
zero_line(...
*
*
This function fills an int array with
*
zeros.
*
***********************************************/
void zero_line(array, length)
short *array;
int
length;
{
int i;
for(i=0; i<length; i++)
array[i] = 0;
} /* ends zero_line */
/***********************************************
*
*
lengthen_pattern(...
*
*
This funtion lengthens the pattern by
*
inserting an element(s) into it. For example,
*
if the input pattern is abcdefg,
*
the output pattern could be abcdefgh.
*
***********************************************/
void lengthen_pattern(size, pattern, index,
current_width, width, max_width)
F.16. CODE LISTINGS FOR CHAPTER 16
703
short *pattern;
int
size, *index, *current_width,
*width, *max_width;
{
int *temp_pattern;
int count, i, new_index, new_width;
temp_pattern = malloc(KONSTANT*(*width)*sizeof(int));
for(i=0; i<(*width); i++)
temp_pattern[i] = pattern[i];
zero_line(pattern, KONSTANT*(*width));
for(count=0, new_index=0; count<size;
count++, new_index++){
pattern[new_index] =
count + *max_width + PATTERN_START;
} /* ends loop over count */
new_width = *current_width + size;
for( ; new_index < new_width; new_index++){
pattern[new_index] = temp_pattern[*index];
*index = *index + 1;
if(*index >= *current_width)
*index = 0;
} /* ends loop over new_index */
*current_width = new_width;
*index
= 0;
*max_width
= *max_width + size;
free(temp_pattern);
} /* ends lengthen_pattern */
/***********************************************
*
*
random_substitution(...
704
APPENDIX F. SOURCE CODE LISTINGS
*
*
This function takes the processed_pattern
*
array and substitutes random values for each
*
value in the array.
*
*
Fill the substitution_values array with
*
random characters that are all printable
*
(PATTERN_START to PATTERN_END).
*
***********************************************/
void random_substitution(processed_pattern, width)
short *processed_pattern;
int
width;
{
int substitution_values[GRAY_LEVELS+1];
int i, place;
get_random_values(substitution_values);
for(i=0; i<(width); i++){
place = processed_pattern[i];
processed_pattern[i] =
substitution_values[place];
} /* ends loop over i */
} /* ends random_substitution */
/***********************************************
*
*
get_random_values(...
*
*
This function fills array with random values.
*
The limit on the random values are from
*
PATTERN_START to PATTERN_END.
*
***********************************************/
void get_random_values(array)
int array[];
{
F.16. CODE LISTINGS FOR CHAPTER 16
705
int i, number;
#ifdef NEVER
these lines worked ok, they used all the printable
characters from 0 through small z
for(i=0; i<ASCII_SIZE; i++){
number
= rand();
number
= number % (PATTERN_END - PATTERN_START);
number
= number + PATTERN_START;
array[i] = number;
} /* ends loop over i */
#endif
#ifdef NEVER
/* Let’s try something different, only use the
characters 0-9 and A-Z
0-9 are 48-57 decimal A-Z are 65-90 */
for(i=0; i<ASCII_SIZE; i++){
number
= rand();
number
= number % 36;
number
= number + PATTERN_START;
if(number > 57
&&
number < 65)
number = number + 7;
array[i] = number;
} /* ends loop over i */
#endif
#ifdef NEVER
/* Let’s try something different, only use the
characters A-Z
A-Z are 65-90 */
for(i=0; i<GRAY_LEVELS+1; i++){
number
= rand();
number
= number % GRAY_LEVELS+1;
array[i] = number;
} /* ends loop over i */
#endif
/* Let’s try something different, only use the
1’s and 0’s */
for(i=0; i<GRAY_LEVELS+1; i++){
706
APPENDIX F. SOURCE CODE LISTINGS
number
= rand();
number
= number % 2;
if(number == 1) number = PATTERN_END;
array[i] = number;
} /* ends loop over i */
} /* ends get_random_values */
/***********************************************
*
* test_print_line(...
*
*
This is a debug function that prints
*
an array of integers.
*
***********************************************/
void test_print_line(line, width)
short *line;
int
width;
{
int i;
for(i=0; i<width; i++)
printf("-%3d", line[i]);
printf("\n");
} /* ends test_print_line */
Listing 16.2 - The pstereo Program
/***********************************************
*
* file scstereo.c
*
* Functions: This file contains
*
main
*
fill_line
*
initialize_pattern
*
s_lengthen_pattern
*
no_change
*
shorten_pattern
F.16. CODE LISTINGS FOR CHAPTER 16
707
*
special_substitution
*
test_print_line
*
* Purpose:
*
This file contains a program that will
*
make character based stereograms.
*
* External Calls:
*
none
*
* Modifications:
*
12 March 1995 - created
*
*************************************************/
#include "cips.h"
#define PATTERN_START 48 /* the zero character
*/
#define PATTERN_END
122 /* the small z character */
#define KONSTANT
2
#define ASCII_SIZE
256
#define LENGTH
80
void fill_line();
void initialize_pattern();
void s_lengthen_pattern();
void no_change();
void shorten_pattern();
void special_substitution();
void test_print_line();
main(argc, argv)
char *argv[];
int argc;
{
char *depth_line,
*pattern,
*processed_pattern,
*pdest,
response[LENGTH],
special_text[LENGTH];
708
APPENDIX F. SOURCE CODE LISTINGS
char last_character,
this_character;
FILE *depth_file,
*processed_pattern_file,
*stereo_file;
int current_width,
j,
index,
location,
max_width,
pattern_width,
pp_index,
s_length,
width;
if(argc != 6){
printf(
"\nusage: scstereo width-of-line "
"depth-file-name"
"\n
stereo-file-name "
"processed-pattern-file-name"
"\n
special-text\n");
exit(1);
}
width = atoi(argv[1]);
strcpy(special_text, argv[5]);
s_length = strlen(special_text);
pattern
= malloc(KONSTANT*width);
depth_line
= malloc(KONSTANT*width);
processed_pattern = malloc(KONSTANT*width);
if((depth_file = fopen(argv[2], "rt")) == NULL){
printf(
"\ncstereo: Error opening input file %s\n",
argv[3]);
exit(3);
}
if((stereo_file = fopen(argv[3], "wt")) == NULL){
printf(
"\ncstereo: Error opening output file %s\n",
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