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SaveBitmapList Method

Summary

Saves MRC images contained in an image list to a file using the MRC LEAD, standard Proprietary T44 or PDF format.

Syntax

C++/CLI

Python

public static void SaveBitmapList( 
   List<MrcSegmenter> segmenters, 
   List<RasterImage> images, 
   string fileName, 
   MrcImageListFormat format, 
   MrcCompressionOptions options 
)

public: 
static void SaveBitmapList(  
   List<MrcSegmenter^>^ segmenters, 
   List<RasterImage^>^ images, 
   String^ fileName, 
   MrcImageListFormat format, 
   MrcCompressionOptions options 
)

def SaveBitmapList(self,segmenters,images,fileName,format,options):

Parameters

segmenters
List of MrcSegmenter objects.

images
List of images to be saved.

fileName
Output file name.

format
Output file format.

options
Structure that contains the compression information to use when saving the file.

Remarks

This method is available in the Document/Medical toolkits. Use this method to save a list of images as a:

TIF file using the Standard T44 format (if the format parameter is set to MrcT44Tif).
TIF file with a LEAD MRC subtype format (if the format parameter is set to MrcTif).
Multipage PDF using segmentation capabilities (if the format parameter is set to MrcPdf).

If format parameter is set to MrcT44Tif or MrcTif, *.TIF is the default file extension. If format parameter is set to MrcPdf, *.PDF is the default file extension. Use this method to save a list of images as a TIF file with a Standard T44 subtype format, LEAD MRC subtype format, or PDF file, based on the LEAD segmentation technique, if you want to:

Take advantage of the greater number of different segment types available when using the proprietary format.
Create smaller files than would be possible by saving them to the Standard T44 format.
Create higher quality files than would be possible by saving them to the Standard T44 format.

All formats supported by this method generate multipage files (TIF, or PDF). The number of pages in the file is the number of images in the list, whichever is smaller. Use the SaveImageT44, or SaveImage methods to save a single image or to append, inset overwrite to already existing TIF file. It is best to perform segmentation for all images in the list before calling this method. Segmentation can be performed automatically by calling the SegmentImage method, or performed manually by calling the AddSegment method. When using this method, segments can be any value of the MrcSegmentType enumeration values. The SegmentImage method maps the text, grayscale and picture segments into layers (mask, background and foreground layers) as defined in the NLS* model of the T.44 standard. A segment is a rectangular area on the image that can be classified as text, grayscale, or picture, depending on the number of colors used in its area. The Mixed Raster Content (MRC) format was developed by the International Telecommunications Union as part of ITU-T Recommendation T.44. If the options parameter is empty, then the method will use Fax G4 compression for the mask layer (1-bit), JPEG compression for the 24 bit image segments and 2 for the quality factor, JPEG compression for the 8 bit grayscale segments and 2 for the quality factor, and JBIG compression for the 2 bit text and 2 bit grayscale segments. For more information, refer to MrcCompressionOptions. Note that the Grayscale2BitCoder, the Grayscale8BitCoder, and the Grayscale8BitFactor properties of the MrcCompressionOptions structure are used only with the MrcTif formats. The Text2BitCoder property of the MrcCompressionOptions structure is used with the MrcTif and MrcPdf formats only. For more information, refer to Programming with LEADTOOLS MRC.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Mrc; 
 
private MrcSegmenter MrcListSegmentation(RasterImage image) 
{ 
   MrcSegmentImageOptions segmentImageOptions = MrcSegmentImageOptions.Empty; 
   segmentImageOptions.CleanSize = 5; 
   segmentImageOptions.SegmentQuality = 50; 
   segmentImageOptions.ColorThreshold = 25; 
   segmentImageOptions.BackgroundThreshold = 10; 
   segmentImageOptions.CombineThreshold = 75; 
   segmentImageOptions.Flags = MrcSegmentImageFlags.FavorOneBit | MrcSegmentImageFlags.SegmentWithBackground; 
 
   RasterColor backColor = new RasterColor(255, 255, 255); 
   RasterColor foreColor = new RasterColor(0, 0, 0); 
 
   MrcSegmenter mrcSegmenter = new MrcSegmenter(image, RasterColor.FromKnownColor(RasterKnownColor.White), RasterColor.FromKnownColor(RasterKnownColor.Black)); 
   mrcSegmenter.SegmentImage(image, segmentImageOptions); 
   return mrcSegmenter; 
} 
 
public void SaveBitmapListExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
   RasterImage image1 = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "MRCSegmentation.mrc")); 
 
   // Load an image 
   RasterImage image2 = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "MRCSegmentation.mrc")); 
 
   MrcSegmenter segmenter1 = MrcListSegmentation(image1); 
   MrcSegmenter segmenter2 = MrcListSegmentation(image2); 
   MrcSegmenter segmenter3 = (MrcSegmenter)segmenter2.Clone(); 
   List<MrcSegmenter> segmenterList = new List<MrcSegmenter>(); 
 
   segmenterList.Add(segmenter1); 
   segmenterList.Add(segmenter2); 
   segmenterList.Add(segmenter3); 
 
   MrcSegmenter[] segmenterArray = new MrcSegmenter[3]; 
 
   segmenterList.CopyTo(segmenterArray, 0); 
 
   List<RasterImage> imageList = new List<RasterImage>(); 
   int index; 
 
   for (index = 0; index < 3; index++) 
   { 
      if (segmenterList.Contains(segmenterArray[index])) 
      { 
         switch (segmenterList.IndexOf(segmenterArray[index])) 
         { 
            case 0: 
               imageList.Add(image1); 
               break; 
            case 1: 
               imageList.Add(image2); 
               break; 
            case 2: 
               // Remove the last segmenter from the segmenter array... 
               segmenterList.Remove(segmenterArray[index]); 
               break; 
         } 
      } 
   } 
   MrcCompressionOptions compressionOptions = new MrcCompressionOptions(); 
 
   compressionOptions.MaskCoder = MrcMaskCompression.FaxG31D; 
   compressionOptions.PictureCoder = MrcPictureCompression.Jpeg; 
   compressionOptions.PictureQualityFactor = 10; 
   compressionOptions.Text2BitCoder = MrcTextCompression2BitCoder.Gif2Bit; 
   compressionOptions.Grayscale2BitCoder = MrcGrayscaleCompression2BitCoder.Jbig2; 
   compressionOptions.Grayscale8BitCoder = MrcGrayscaleCompression8BitCoder.GrayscaleCmw; 
   compressionOptions.Grayscale8BitFactor = 2; 
 
   // Save the two segmenters 
   MrcSegmenter.SaveBitmapList(segmenterList, imageList, Path.Combine(LEAD_VARS.ImagesDir, "SaveBitmapListResult.mrc"), MrcImageListFormat.MrcTif, compressionOptions); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}