HOW TO: Use LEADTOOLS MRC to save file segments

#1 Posted : Friday, October 13, 2017 2:24:31 PM(UTC)

Walter

Groups: Tech Support
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Attached is a Visual Studio 2010 project written in C++ to illustrate how to use LEADTOOLS MRC segmentation. This simplified demo uses LEADTOOLS MRC segmentation to identify different areas of a bitmap to compress out as separate files. Typically with MRC files, all of this would be wrapped up in a TIFF or PDF file. This demo just explodes the typical output into many smaller files.

The main method of the application loops through each page in a file, starts the segmentation process, and then uses a callback to enumerate the different segments found:

Code:

   for(int i = 0; i < myData.nPagesCount; i++)
   {
      nRet = myData.bitmap.Load(0, ORDER_RGB, i, &(myData.fInfo));
      if(nRet != SUCCESS) 
         goto cleanup;

      // Start the segmentation process
      nRet = segment.Start(&myData,i+1);
      if(nRet == SUCCESS) 
      {

         /* do the auto-segmentation*/ 
         nRet = segment.FindSegments(&myData); 

         if(nRet == SUCCESS) 
         { 
            segment.EnableCallBack  (TRUE); 
            nRet = segment.MrcEnumSegments (0); 
            segment.EnableCallBack(FALSE); 
         } 
         /* end the segmentation process */ 
         nRet = segment.Stop();

         if(nRet != SUCCESS) 
            goto cleanup;
      } 
      else 
         goto cleanup;
   }

The magic happens in the MrcEnumSegmentsCallBack(). A lot of the code written for this was to generate a new file name each time, and then check the pSegmentData->uType to see what type of segment was identified. Based on this, different raster compressions would be used to save out the individual segments.

Code:

   // Figure out the type of file to save
   if(pSegmentData->uType == SEGTYPE_BACKGROUND)
   {
      fileFormat = FILE_TIFLZW;
   }
   else if(pSegmentData->uType == SEGTYPE_ONECOLOR)
   {
      bitsPerPixel = 1;
      fileFormat = FILE_PNG;
      szFileExtension = L_TEXT(".png");
   }
   else if(pSegmentData->uType == SEGTYPE_TEXT_1BIT_BW)
   {
      bitsPerPixel = 1;
      fileFormat = FILE_JBIG2;
      szFileExtension = L_TEXT(".jb2");
   }
   else if(pSegmentData->uType == SEGTYPE_TEXT_1BIT_COLOR)
   {
      bitsPerPixel = 1;
      fileFormat = FILE_PNG;
      szFileExtension = L_TEXT(".png");
   }
   else if(pSegmentData->uType == SEGTYPE_TEXT_2BITBW || pSegmentData->uType == SEGTYPE_TEXT_2BIT_COLOR || pSegmentData->uType == SEGTYPE_GRAYSCALE_2BIT)
   {
      bitsPerPixel = 2;
      fileFormat = FILE_TIFLZW;
      szFileExtension = L_TEXT(".tif");
   }
   else if(pSegmentData->uType == SEGTYPE_GRAYSCALE_8BIT)
   {
      bitsPerPixel = 8;
      fileFormat = FILE_JPEG;
      szFileExtension = L_TEXT(".jpg");
   }
   else if(pSegmentData->uType == SEGTYPE_PICTURE)
   {
      bitsPerPixel = 24;
      fileFormat = FILE_JPEG;
      szFileExtension = L_TEXT(".jpg");
   }

   ...

   // Save the segment to file
   if(m_DemoData != NULL)
   {
      LBitmapBase tempBitmap;
      tempBitmap.CopyRect(m_DemoData->bitmap, pSegmentData->rcBitmapSeg);
      tempBitmap.Save(szOutputFileName, fileFormat, bitsPerPixel, QUALITY_FACTOR, SAVE_FLAGS);
   }

The code targets the LEADTOOLS 19 VC10 binaries. To run this project, please do the following:
1.) Extract the project to the following directory:
C:\LEADTOOLS 19\Examples\posts\t12327\
2.) In Main.cpp, update Developer license and key on lines 18 & 19
3.) (Optional) In DemoData.cpp, update the input file on line 4 and output directory on line 11

File Attachment(s):

C_MRC_SaveIndividualSegments.zip (40kb) downloaded 171 time(s).

Walter Bates
Senior Support Engineer
LEAD Technologies, Inc.


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HOW TO: Use LEADTOOLS MRC to save file segments