pstereo.c

This is code tutorial for image processing include:histogram,sketon....

   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];

   *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)
   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(...
   *
   *   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[];
{
   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++){
       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 */

                                 
   

#ifdef NEVER

   /***********************************************
   *
   *   read_image_line(...
   *
   *   This function reads a line of pixels from
   *   a TIFF image file.
   *
   ***********************************************/

void read_image_line(the_image, file_name, 
                     line_number, array, width)
   char  file_name[];
   short the_image[ROWS][COLS];
   int   *array, line_number, width;
{
   int i, il, ie, ll, le, 
       pixels_to_read, 
       reading_counter, 
       still_reading;

   il = line_number;
   ll = il + 1;
   ie = 1; 
   le = ie + COLS;

   if(width < COLS)
      le  = ie + (width - 1);

   pixels_to_read  = width;
   reading_counter = 0;

   still_reading = 1;
   while(still_reading){

      read_tiff_image(file_name, the_image, 
                      il, ie, ll, le);
      for(i=0; i<(le-ie); i++)
         array[i + (reading_counter*COLS)] = 
            the_image[0][i];
      reading_counter++;

      pixels_to_read = pixels_to_read - (le-ie);
      if(pixels_to_read <= 1)
         still_reading = 0;
      else{
         ie = ie + COLS;
         le = ie + COLS;
         if(le > width)
            le = width;
      }  /* ends else */
         
   }  /* ends while still_reading */

}  /* ends read_image_line */



                                 
                                 
   /***********************************************
   *
   *   write_image_line(...
   *
   *   This function writes a line of pixels to
   *   a TIFF image file.
   *
   ***********************************************/

void write_image_line(the_image, file_name, 
                      line_number, array, width)
   char  file_name[];
   short the_image[ROWS][COLS];
   int   *array, line_number, width;
{
   int  i, il, ie, ll, le,
        pixels_to_write,
        writing_counter,
        still_writing;

   il = line_number; 
   ll = il + 1;
   ie = 1;
   le = ie + COLS;

   if(width < COLS)
      le = ie + (width - 1);

   pixels_to_write = width;
   writing_counter = 0;

   still_writing = 1;
   while(still_writing){
      
      for(i=0; i<(le-ie); i++)
         the_image[0][i] =
            array[i + (writing_counter*COLS)];
      writing_counter++;

      write_array_into_tiff_image(file_name, the_image,
                                  il, ie, ll, le);

      pixels_to_write = pixels_to_write - (le-ie);
      if(pixels_to_write <= 1)
         still_writing = 0;
      else{
         ie = ie + COLS;
         le = ie + COLS;
         if(le > width)
            le = width;
      }  /* ends else */

   }  /* ends while still_writing */

}  /* ends write_image_line */

#endif