IOcrOmrOptions Interface (original) (raw)
Summary
The OMR (Optical Mark Recognition) settings currently used by the engine.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public interface IOcrOmrOptions @interface LTOcrOmrOptions : NSObject public class OcrOmrOptions public interface class IOcrOmrOptions Example
This example will load a TIF image, create OMR zones and recognize them.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Ocr;
using Leadtools.Forms.Common;
using Leadtools.Document.Writer;
using Leadtools.WinForms;
public void OcrOmrExample()
{
// Create an instance of the engine
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD))
{
// Start the engine using default parameters
ocrEngine.Startup(null, null, null, LEAD_VARS.OcrLEADRuntimeDir);
// We will use Mixed.tif shipped with LEADTOOLS in the Images folder. This image has 3 OMR check marks
string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "Mixed.tif");
// Create an OCR document
using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument())
{
// Add a page to the document
IOcrPage ocrPage = ocrDocument.Pages.AddPage(tifFileName, null);
// Add the OMR zones. We calculated the 3 OMR zone boundaries for this image perviously
LeadRect[] omrBounds =
{
new LeadRect(484, 98, 84, 78),
new LeadRect(494, 184, 70, 54),
new LeadRect(498, 244, 76, 76)
};
foreach (LeadRect omrBound in omrBounds)
{
// Create a new OMR zone and add it to the page
OcrZone zone = new OcrZone();
zone.ZoneType = OcrZoneType.Omr;
zone.Bounds = omrBound;
ocrPage.Zones.Add(zone);
}
// Show how many zones we have and they properties
Console.WriteLine("Page has {0} zones:", ocrPage.Zones.Count);
for (int i = 0; i < ocrPage.Zones.Count; i++)
{
OcrZone zone = ocrPage.Zones[i];
Console.WriteLine("{0}: Type: {1}", i + 1, zone.ZoneType);
}
// Change the OMR options (Auto detection of frames with highest sensitivity)
IOcrOmrOptions omrOptions = ocrEngine.ZoneManager.OmrOptions;
omrOptions.FrameDetectionMethod = OcrOmrFrameDetectionMethod.Auto;
omrOptions.Sensitivity = OcrOmrSensitivity.Highest;
// Get the character we are using in the engine to represent the filled/unfilled states
char filledCode = omrOptions.GetStateRecognitionCharacter(OcrOmrZoneState.Filled);
char unfilledCode = omrOptions.GetStateRecognitionCharacter(OcrOmrZoneState.Unfilled);
// Recognize the page
Console.WriteLine("Recognizing...");
ocrPage.Recognize(null);
IOcrPageCharacters pageCharacters = ocrPage.GetRecognizedCharacters();
foreach (IOcrZoneCharacters zoneCharacters in pageCharacters)
{
// We must have one character (the state for each OMR zone)
Debug.Assert(zoneCharacters.Count == 1);
OcrCharacter character = zoneCharacters[0];
Debug.Assert(character.Code == filledCode || character.Code == unfilledCode);
Console.WriteLine("{0}: State: {1}, Confidence: {2}", zoneCharacters.ZoneIndex, character.Code == filledCode ? "Filled" : "Unfilled", character.Confidence);
}
// Now save the result as PDF using the default characters representation for OMR states (0 for unfilled, 1 for filled)
string pdfFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Omr_Results1.pdf");
Console.WriteLine("Saving to {0}...", pdfFileName1);
ocrDocument.Save(pdfFileName1, DocumentFormat.Pdf, null);
// Change the character representation for the OMR states to Y for unfilled, and X for filled
omrOptions.SetStateRecognitionCharacter(OcrOmrZoneState.Unfilled, 'Y');
omrOptions.SetStateRecognitionCharacter(OcrOmrZoneState.Filled, 'X');
string pdfFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Omr_Results2.pdf");
Console.WriteLine("Saving to {0}...", pdfFileName2);
ocrDocument.Save(pdfFileName2, DocumentFormat.Pdf, null);
}
// Shutdown the engine
// Note: calling Dispose will also automatically shutdown the engine if it has been started
ocrEngine.Shutdown();
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS22\Bin\Common\OcrLEADRuntime";
}