Question

Is it possible to print the detected blocks after the analysis step?

Answer

The following code will display the document analysis results graphically:

private void DrawBlocks(FREngine.Layout layout, string imagePath)
{
 //create a Graphics object
 Bitmap InitialImage = new Bitmap(imagePath);
 Bitmap EditableImage = new Bitmap(InitialImage);
 Graphics gr = Graphics.FromImage(EditableImage);
 
 //draw each block
 for (int i = 0; i < layout.Blocks.Count; i++)
 {
 //set pen color depending on block type; 
 int type = (int)layout.Blocks.Item(i).Type;
 
 Color clr; 
 switch (type)
 {
 case 0: 
 clr = Color.Green; //text
 break;
 case 1: 
 clr = Color.Red; //raster picture 
 break;
 case 2:
 clr = Color.Purple; //table
 break;
 case 3:
 clr = Color.LawnGreen; //barcode
 break;
 default:
 clr = Color.Pink; //others
 break;
 }
 
 Pen pen = new Pen(clr, 10);
 
 //draw each region of the current block using selected color
 for (int j = 0; j < layout.Blocks.Item(i).Region.Count; j++)
 {
 int left = layout.Blocks.Item(i).Region.get_Left(j);
 int top = layout.Blocks.Item(i).Region.get_Top(j);
 int right = layout.Blocks.Item(i).Region.get_Right(j);
 int bottom = layout.Blocks.Item(i).Region.get_Bottom(j);
 
 int width = right - left;
 int height = bottom - top;
 
 gr.DrawRectangle(pen, left, top, width, height);
 }
 }
 //save modified image
 EditableImage.Save(System.IO.Path.ChangeExtension(imagePath, ".gif"), System.Drawing.Imaging.ImageFormat.Gif);
}
…
private void processImage()
{
 string imagePath = @"D:\Demo.tif";
 FREngine.FRDocument document = engineLoader.Engine.CreateFRDocumentFromImage(imagePath);
 document.Analyze(null);
 DrawBlocks(document.Pages[0].Layout, imagePath);
 
 document.Close();
}