imgtiff.cpp

一ＯＣＲ的相关资料。．希望对研究ＯＣＲ的朋友有所帮助．

  read_eol(&bits, codeword);  //find end of line
  for (yindex = ysize - 1; yindex >= 0; yindex--) {
    imageline.init ();
    colour = TRUE;
    for (xindex = 0; xindex < xsize;) {
      if (colour) {
        lengths = long_white_lengths;
        codes = long_white_codes;
      }
      else {
        lengths = long_black_lengths;
        codes = long_black_codes;
      }
      for (biglength = 0; biglength < LONG_CODE_SIZE
        && (codeword & bits.masks (*lengths))
        != *codes; codes++, lengths++, biglength++);
      if (biglength < LONG_CODE_SIZE) {
        codeword = bits.read_code (*lengths);
        biglength++;
        biglength *= SHORT_CODE_SIZE;
      }
      else
        biglength = 0;
      if (colour) {
        lengths = short_white_lengths;
        codes = short_white_codes;
      }
      else {
        lengths = short_black_lengths;
        codes = short_black_codes;
      }
      for (length = 0; length < SHORT_CODE_SIZE
        && (codeword & bits.masks (*lengths))
        != *codes; codes++, lengths++, length++);
      if (length < SHORT_CODE_SIZE) {
        codeword = bits.read_code (*lengths);
        for (length += biglength; length > 0; length--, xindex++)
          imageline.pixels[xindex] = colour;
        colour = !colour;
      }
      else
        break;
    }
    if (xindex < xsize) {
      tprintf ("%d pixels short on line %d", xsize - xindex, yindex);
      tprintf (", unknown code=%x\n", codeword);
    }
    xindex = read_eol (&bits, codeword);
    if (xindex > 0)
      tprintf ("Discarding %d bits on line %d\n", xindex, yindex);
    image.put_line (0, yindex, xsize, &imageline, 0);
  }
  return 0;
}


/**********************************************************************
 * read_eol
 *
 * Take bits out of the stream until and end-of-line code is hit.
 **********************************************************************/

INT32 read_eol(                    //read end of line
               R_BITSTREAM *bits,  //bitstream to read
               UINT16 &code        //current code
              ) {
  BOOL8 anyones;                 //any 1 bits skipped
  INT32 bitcount;                //total bits skipped

  anyones = FALSE;
  bitcount = 0;
  while ((code & EOL_MASK) != EOL_CODE) {
    if (code & 1)
      anyones = TRUE;            //discarded one bit
    bitcount++;                  //total discarded bits
    code = bits->read_code (1);  //take single bits
  }
                                 //extract EOL code
  code = bits->read_code (EOL_LENGTH);

  if (!anyones)
    bitcount = 0;                //ignore filler bits
  return bitcount;
}


/**********************************************************************
 * write_moto_tif
 *
 * Write a whole tif format image and close the file.
 **********************************************************************/

INT8 write_moto_tif(                //write whole image
                    int fd,         //file to write on
                    UINT8 *pixels,  //image pixels
                    INT32 xsize,    //size of image
                    INT32 ysize,
                    INT8 bpp,       //bits per pixel
                    INT8 photo,
                    INT32 res       //resolution
                   ) {
  return write_tif_image (fd, pixels, xsize, ysize, bpp, res, MOTO, photo);
  //use moto format
}


/**********************************************************************
 * write_intel_tif
 *
 * Write a whole tif format image and close the file.
 **********************************************************************/

INT8 write_intel_tif(                //write whole image
                     int fd,         //file to write on
                     UINT8 *pixels,  //image pixels
                     INT32 xsize,    //size of image
                     INT32 ysize,
                     INT8 bpp,       //bits per pixel
                     INT8 photo,
                     INT32 res       //resolution
                    ) {
  return write_tif_image (fd, pixels, xsize, ysize, bpp, res, INTEL, photo);
  //use intel format
}


/**********************************************************************
 * write_inverse_tif
 *
 * Write a whole tif format image and close the file.
 **********************************************************************/

INT8 write_inverse_tif(                //write whole image
                       int fd,         //file to write on
                       UINT8 *pixels,  //image pixels
                       INT32 xsize,    //size of image
                       INT32 ysize,
                       INT8 bpp,       //bits per pixel
                       INT8 photo,
                       INT32 res       //resolution
                      ) {
  return write_tif_image (fd, pixels, xsize, ysize, bpp, res, INTEL,
    1 - photo);
  //use intel format
}


/**********************************************************************
 * write_tif_image
 *
 * Write a whole tif format image and close the file.
 **********************************************************************/

INT8 write_tif_image(                //write whole image
                     int fd,         //file to write on
                     UINT8 *pixels,  //image pixels
                     INT32 xsize,    //size of image
                     INT32 ysize,
                     INT8 bpp,       //bits per pixel
                     INT32 res,      //resolution
                     INT16 type,     //format type
                     INT16 photo     //metric interp
                    ) {
  INT32 size;                    //line/image size
  INT16 entries;                 //no of tiff entries
  INT32 start;                   //start of tag table
  INT32 zero = 0;
  MYRATIONAL resolution;         //resolution
  TIFFENTRY entry;               //current entry

  static TIFFENTRY tags[ENTRIES] = {
    {0xfe, 4, 1, 0},
    {0x100, 3, 1, 0},
    {0x101, 3, 1, 0},
    {0x102, 3, 1, 0},
    {0x103, 3, 1, 1},
    {0x106, 3, 1, 1},
    {                            /*line art */
      0x107, 3, 1, 1
    },
    {0x10a, 3, 1, 1},
    {
      0x111, 4, 1, START + ENTRIES * sizeof (TIFFENTRY)
      + sizeof (INT32) + sizeof (short) + sizeof (MYRATIONAL) * 2
    }
    ,
    {0x112, 3, 1, 1}
    ,
    {0x115, 3, 1, 1}
    ,
    {0x116, 4, 1, 0}
    ,
    {0x117, 4, 1, 0}
    ,
    {0x118, 3, 1, 0}
    ,
    {0x119, 3, 1, 1}
    ,
    {
      0x11a, 5, 1, START + ENTRIES * sizeof (TIFFENTRY)
      + sizeof (INT32) + sizeof (short)
    },
    {
      0x11b, 5, 1, START + ENTRIES * sizeof (TIFFENTRY)
      + sizeof (INT32) + sizeof (short) + sizeof (MYRATIONAL)
    }
    ,
    {0x11c, 3, 1, 1}
    ,
    {0x128, 3, 1, 2}
  };

  resolution.top = res;
  resolution.bottom = 1;
  if (write (fd, (char *) &type, sizeof type) != sizeof type
  || type != INTEL && type != MOTO) {
    WRITEFAILED.error ("write_tif_image", LOG, "Filetype");
    return -1;
  }
  start = START;
  entries = 0x002a;
  if (type != __NATIVE__)
    entries = reverse16 (entries);
  if (write (fd, (char *) &entries, sizeof entries) != sizeof entries) {
    WRITEFAILED.error ("write_tif_image", LOG, "Version");
    return -1;
  }
  if (type != __NATIVE__)
    start = reverse32 (start);
  if (write (fd, (char *) &start, sizeof start) != sizeof start) {
    WRITEFAILED.error ("write_tif_image", LOG, "Start");
    return -1;
  }
  lseek (fd, (long) START, 0);
  entries = ENTRIES;
  if (type != __NATIVE__)
    entries = reverse16 (entries);
  if (write (fd, (char *) &entries, sizeof entries) != sizeof entries) {
    WRITEFAILED.error ("write_tif_image", LOG, "Entries");
    return -1;
  }
                                 //line length
  size = COMPUTE_IMAGE_XDIM (xsize, bpp);
  size *= ysize;                 //total image size
  //      if (photo==0)
  //      {
  //              tags[0].tag=0xfe;
  //              tags[0].type=4;
  //              tags[0].value=0;
  //      }
  //      else
  //      {
  //              tags[0].tag=0xff;
  //              tags[0].type=3;
  //              tags[0].value=1;
  //      }
  tags[1].value = xsize;
  tags[2].value = ysize;
  if (bpp == 24) {
    tags[3].value = 8;
    tags[10].value = 3;
    tags[5].value = 2;
  }
  else {
    tags[3].value = bpp;
    tags[5].value = photo;
  }
  tags[11].value = ysize;
  tags[14].value = (1 << bpp) - 1;
  tags[12].value = size;
  for (entries = 0; entries < ENTRIES; entries++) {
    entry = tags[entries];       //get an entry
    /* NB Convert entry.value BEFORE converting entry.type!!! */
    if (entry.type != 3) {       //Full 32bit value
      if (type != __NATIVE__)
        entry.value = reverse32 (entry.value);
    }
    else {
      /* A 16bit value in 4 bytes - handle with care. SEE NOTE at start of file */
      entry.value &= 0x0000ffff; //Ensure top 2 MSBytes clear
      if (__NATIVE__ == MOTO) {
        if (type == MOTO)        //MOTO file on MOTO Machine
          entry.value = entry.value << 16;
        else                     //INTEL file on MOTO Machine
          entry.value = reverse32 (entry.value);
      }
      else {                     //INTEL Machine
        if (type == MOTO)        //MOTO file on INTEL Machine
          entry.value = reverse16 ((UINT16) entry.value);
        //INTEL file on INTEL Machine NO ACTION NEEDED
      }
    }
    if (type != __NATIVE__) {
      entry.tag = reverse16 (entry.tag);
      entry.type = reverse16 (entry.type);
      entry.length = reverse32 (entry.length);
    }
    if (write (fd, (char *) &entry, sizeof (TIFFENTRY)) !=
    sizeof (TIFFENTRY)) {
      WRITEFAILED.error ("write_tif_image", LOG, "Tag Table");
      return -1;
    }
  }
  if (write (fd, (char *) &zero, sizeof zero) != sizeof zero) {
    WRITEFAILED.error ("write_tif_image", LOG, "Tag table Terminator");
    return -1;
  }
  if (type != __NATIVE__) {
    resolution.top = reverse32 (resolution.top);
    resolution.bottom = reverse32 (resolution.bottom);
  }
  if (write (fd, (char *) &resolution, sizeof resolution) != sizeof resolution
    || write (fd, (char *) &resolution,
  sizeof resolution) != sizeof resolution) {
    WRITEFAILED.error ("write_tif_image", LOG, "Resolution");
    return -1;
  }
  if (write (fd, (char *) pixels, (size_t) size) != size) {
    WRITEFAILED.error ("write_tif_image", LOG, "Image");
    return -1;
  }
  close(fd); 
  return 0;
}


/**********************************************************************
 * reverse32
 *
 * Byte swap the 32 bit number between Motorola & Intel format.
 **********************************************************************/

//INT32                                                         reverse32(                                                      //reverse 32 bit int
//UINT32                                                        value                                                                   //value to reverse
//)
//{
//      return (value>>24) | (value>>8) & 0xff00
//      | (value<<8) & 0xff0000 | (value<<24);
//}

/**********************************************************************
 * reverse16
 *
 * Byte swap the 16 bit number between Motorola & Intel format.
 **********************************************************************/

//INT16                                                         reverse16(                                                      //reverse 16 bit int
//UINT16                                                        value                                                                   //value to reverse
//)
//{
//      return (value>>8) | (value<<8);
//}