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AutoDetectCells Method

Detects the cells within a table zone.
public void AutoDetectCells( 
   int zoneIndex 
void AutoDetectCells(  
   int zoneIndex 
def AutoDetectCells(self,zoneIndex): 


The 0-based index of the zone inside this page IOcrPage.Zones. This zone must exist in the list and its type must be a table (OcrZone.ZoneType must be OcrZoneType.Table) otherwise, this method will throw an exception.


When this method returns, an internal array of the cells is stored in the engine containing the detected cells and their properties.

You can use table cells in one of two ways:

  • Perform auto-zoning on the page using IOcrPage.AutoZone, if the page contains a detected table, the a zone of type OcrZoneType.Table is created for this table. If the engine successfully detects the cells of the table, then it will fill the an internal OcrZoneCell array with the properties of the detected cells.

  • Manually add a new OcrZone with its type set to OcrZoneType.Table to the zones collection of a page. Leave the value of the cells to null (Nothing in VB), now use the IOcrTableZoneManager.AutoDetectCells method to instruct the engine to detect any cells in this zone and fill the array with the data.

To manipulate a cell properties other than its bound (OcrZoneCell.Bounds), get the array of detected cells through IOcrZoneCollection.GetZoneCells, change the cell background color, style or any border color, style or with. When you are done, re-set the array using IOcrZoneCollection.SetZoneCells.

It is not recommended that you manually remove or add cells to the array, the engine is very sensitive to zone boundaries and any non-accurate information will cause an error. Instead, use the various methods of IOcrTableZoneManager to manipulate the cell location and size.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Forms.Common; 
using Leadtools.Ocr; 
using Leadtools.Drawing; 
private static void IOcrTableZoneManageExample(IOcrEngine ocrEngine, string documentFileName) 
   // Create a document and add the page to it 
   using (IOcrPage ocrPage = ocrEngine.CreatePage(ocrEngine.RasterCodecsInstance.Load(documentFileName, 1), OcrImageSharingMode.AutoDispose)) 
      // The coordinate for the table has been previously determined: 
      LeadRect tableBounds = new LeadRect(266, 554, 404, 647); 
      // Add a table zone with these bounds 
      OcrZone zone = new OcrZone(); 
      zone.ZoneType = OcrZoneType.Table; 
      zone.Bounds = tableBounds; 
      if (ocrPage.TableZoneManager != null) 
         // Detect the cells inside this table 
         IOcrTableZoneManager ocrTableZoneManager = ocrPage.TableZoneManager; 
      // Show the cells for this zone (if any) 
      zone = ocrPage.Zones[0]; 
      Console.WriteLine("Detected values:"); 
      ShowCells(ocrPage, zone); 
      // Change the style of the first cell to have no borders 
      OcrZoneCell[] cells = ocrPage.Zones.GetZoneCells(zone); 
      if (cells != null && cells.Length > 0) 
         OcrZoneCell cell = cells[0]; 
         cell.LeftBorderStyle = OcrCellBorderLineStyle.None; 
         cell.TopBorderStyle = OcrCellBorderLineStyle.None; 
         cell.RightBorderStyle = OcrCellBorderLineStyle.None; 
         cell.BottomBorderStyle = OcrCellBorderLineStyle.None; 
         cells[0] = cell; 
      ocrPage.Zones.SetZoneCells(zone, cells); 
      Console.WriteLine("Updated values:"); 
      ShowCells(ocrPage, zone); 
private static void ShowCells(IOcrPage ocrPage, OcrZone zone) 
   OcrZoneCell[] cells = ocrPage.Zones.GetZoneCells(zone); 
   if (cells != null) 
      Console.WriteLine("Table contains {0} zones", cells.Length); 
      for (int i = 0; i < cells.Length; i++) 
         Console.WriteLine("  Cell {0}:", i); 
         OcrZoneCell cell = cells[i]; 
         Console.WriteLine("    Type: {0}", cell.CellType); 
         Console.WriteLine("    Bounds: {0}", cell.Bounds); 
         Console.WriteLine("    Background color: {0}", cell.BackgroundColor); 
         Console.WriteLine("    Left border color: {0}", cell.LeftBorderColor); 
         Console.WriteLine("    Left border width: {0}", cell.LeftBorderWidth); 
         Console.WriteLine("    Left border style: {0}", cell.LeftBorderStyle); 
         Console.WriteLine("    Top border color: {0}", cell.TopBorderColor); 
         Console.WriteLine("    Top border width: {0}", cell.TopBorderWidth); 
         Console.WriteLine("    Top border style: {0}", cell.TopBorderStyle); 
         Console.WriteLine("    Right border color: {0}", cell.RightBorderColor); 
         Console.WriteLine("    Right border width: {0}", cell.RightBorderWidth); 
         Console.WriteLine("    Right border style: {0}", cell.RightBorderStyle); 
         Console.WriteLine("    Bottom border color: {0}", cell.BottomBorderColor); 
         Console.WriteLine("    Bottom border width: {0}", cell.BottomBorderWidth); 
         Console.WriteLine("    Bottom border style: {0}", cell.BottomBorderStyle); 

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