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F.16. CODE LISTINGS FOR CHAPTER 16
689
/***********************************************
*
*
initialize_pattern(...
*
*
This function creates an initial pattern
*
that is as wide as the pattern_width
*
parameter.
*
***********************************************/
void initialize_pattern(pattern, current_width,
max_width, pattern_width,
index)
char 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.
*
***********************************************/
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690
APPENDIX F. SOURCE CODE LISTINGS
void no_change(pattern, processed_pattern, pp_index,
current_width, index)
char *pattern, *processed_pattern;
int pp_index, current_width, *index;
{
processed_pattern[pp_index] =
pattern[*index];
*index = *index + 1;
if(*index >= current_width)
*index = 0;
}
/* ends no_change */
/***********************************************
*
*
fill_line(...
*
*
This function fills a character array
*
with NULL characters.
*
***********************************************/
void fill_line(line, length)
char *line;
int length;
{
int i;
for(i=0; i<length; i++)
line[i] = ’\0’;
} /* ends fill_line */
/***********************************************
*
*
lengthen_pattern(...
*
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F.16. CODE LISTINGS FOR CHAPTER 16
691
*
This funtion lengthens the pattern by
*
inserting an element(s) from 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)
char *pattern;
int size, *index, *current_width,
*width, *max_width;
{
char *temp_pattern;
int count, i, new_index, new_width;
temp_pattern = malloc(KONSTANT*(*width));
for(i=0; i<(*width); i++)
temp_pattern[i] = pattern[i];
fill_line(pattern, *width);
for(count=0, new_index=0; count<size;
count++, new_index++)
pattern[new_index] =
count + *max_width + PATTERN_START;
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 */
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692
APPENDIX F. SOURCE CODE LISTINGS
/***********************************************
*
*
random_substitution(...
*
*
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)
char *processed_pattern;
int width;
{
char substitution_values[ASCII_SIZE];
int i, place;
get_random_values(substitution_values);
for(i=0; i<(KONSTANT*width); i++){
if(processed_pattern[i] != ’\n’
&&
processed_pattern[i] != ’\0’){
place = processed_pattern[i];
processed_pattern[i] =
substitution_values[place];
} /* ends if */
} /* ends loop over i */
} /* ends random_substitution */
/***********************************************
*
*
get_random_values(...
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F.16. CODE LISTINGS FOR CHAPTER 16
693
*
*
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)
char array[];
{
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
/* Let’s try something different, only use the
characters A-Z
A-Z are 65-90 */
for(i=0; i<ASCII_SIZE; i++){
number
= rand();
number
= number % 26;
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694
APPENDIX F. SOURCE CODE LISTINGS
number
= number + 65;
array[i] = number;
} /* ends loop over i */
} /* ends get_random_values */
/***********************************************
*
* test_print_line(...
*
*
This is a debug function that prints
*
an array of characters.
*
***********************************************/
void test_print_line(line, width)
char *line;
int width;
{
int i;
for(i=0; i<width; i++)
printf("%c", line[i]);
printf("\n");
} /* ends test_print_line */
Listing 16.1 - The cstereo Program
/***********************************************
*
* file pstereo.c
*
* Functions: This file contains
*
main
*
zero_line
*
initialize_pattern
*
lengthen_pattern
*
no_change
*
shorten_pattern
*
get_random_values
F.16. CODE LISTINGS FOR CHAPTER 16
695
*
random_substitution
*
test_print_line
*
* Purpose:
*
This file contains a program that will
*
make pixel based random dot stereograms.
*
* External Calls:
*
imageio.c - read_image_array
*
write_image_array
*
create_image_file
*
allocate_image_array
*
free_image_array
*
get_image_size
*
does_not_exist
*
* Modifications:
*
18 March 1995 - created
*
27 August 1998 - modified to work on
*
entire images at once.
*
*************************************************/
#include "cips.h"
#define KONSTANT
2
#define PATTERN_START
0
#define PATTERN_END
255
#define ASCII_SIZE
256
short **depth_image,
**pattern,
**processed_pattern;
void zero_line();
void initialize_pattern();
void lengthen_pattern();
void no_change();
void shorten_pattern();
void get_random_values();
void random_substitution();
void read_image_line();
void write_image_line();
696
APPENDIX F. SOURCE CODE LISTINGS
void test_print_line();
main(argc, argv)
char *argv[];
int argc;
{
char depth_file_name[MAX_NAME_LENGTH],
s_file_name[MAX_NAME_LENGTH],
pp_file_name[MAX_NAME_LENGTH],
response[MAX_NAME_LENGTH];
FILE *depth_file,
*processed_pattern_file,
*stereo_file;
int current_width,
i,
j,
index,
last_pixel,
location,
max_width,
pattern_width,
pp_index,
this_pixel;
long length, width;
int line = 0;
if(argc != 5){
printf(
"\nusage: pstereo pattern-width "
"\n
depth-file-name "
"stereo-file-name "
"\n
processed-pattern-file-name"
"\n");
exit(1);
}
pattern_width =
atoi(argv[1]);
strcpy(depth_file_name,
argv[2]);
strcpy(s_file_name,
argv[3]);
F.16. CODE LISTINGS FOR CHAPTER 16
697
strcpy(pp_file_name,
argv[4]);
if(does_not_exist(depth_file_name)){
printf("\nThe depth file %s does not exist",
depth_file_name);
exit(1);
}
get_image_size(depth_file_name, &length, &width);
depth_image
= allocate_image_array(length, width);
pattern
= allocate_image_array(length, width);
processed_pattern = allocate_image_array(
length, width);
create_image_file(depth_file_name, s_file_name);
create_image_file(depth_file_name, pp_file_name);
read_image_array(depth_file_name, depth_image);
/***********************************************
*
*
This is the major loop of the program.
*
It reads one line at a time from the
*
depth file, processes that one line,
*
and writes the resulting pattern to the
*
processed pattern file.
*
***********************************************/
for(i=0; i<length; i++){
if(i%10 == 0) printf(" %d", i);
zero_line(pattern[i], width);
zero_line(processed_pattern[i], width);
initialize_pattern(pattern[i],
&current_width,
&max_width,
pattern_width,
&index);
/*******************************************
*
*
Loop through the pixels in the
*
depth_line. Call one of the three
*
processing routines based on the
698
APPENDIX F. SOURCE CODE LISTINGS
*
relationship between the last pixel
*
and this pixel.
*
*******************************************/
last_pixel = depth_image[i][0];
pp_index = 0;
for(j=0; j<width; j++){
this_pixel = depth_image[i][j];
if(this_pixel > last_pixel)
shorten_pattern(
(this_pixel-last_pixel),
pattern[i], &index, &current_width,
width);
if(this_pixel < last_pixel)
lengthen_pattern(
(last_pixel-this_pixel),
pattern[i], &index, &current_width,
&width, &max_width);
/****************************************
*
*
Perform the no_change in every
*
pass. Do it after you have done
*
the shorten and lenghten pattern.
*
****************************************/
no_change(pattern[i], processed_pattern[i],
pp_index, current_width, &index);
pp_index++;
if(index >= current_width)
index = 0;
last_pixel = depth_image[i][j];
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