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HOW TO: Create a simple OMR processing forms demo
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Tuesday, April 11, 2017 4:25:32 PM(UTC)
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The attached VS 2017 C# .NET Project uses the
LEADTOOLS Forms SDK to processed filled out Bubble sheet or OMR (optical mark recognition) forms against a master form.
The class doing all of the hard work is the
AutoFormsEngine.
Here is the relevant code:
Code: //Create a new instance of RasterCodecs
using (RasterCodecs codecs = new RasterCodecs())
{
//We want to load all pages since it could be a multipage masterform / filled form
codecs.Options.Load.AllPages = true;
//Make sure to load any documents as 300x300 DPI for best accuracy
codecs.Options.RasterizeDocument.Load.XResolution = 300;
codecs.Options.RasterizeDocument.Load.YResolution = 300;
//Set the directory of the Master Form Repository
string masterFormRepository = @"C:\Users\Public\Documents\LEADTOOLS Images\Forms\MasterForm Sets\OMR";
//set the directory of the filled forms
string filledFormDirectory = @"C:\Users\Public\Documents\LEADTOOLS Images\Forms\Forms to be Recognized\OMR";
//Startup the OCR Engine
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false))
{
ocrEngine.Startup(codecs, null, null, null);
//Create the repository initialize the AutoFormsEngine and load each form
IMasterFormsRepository repository = new DiskMasterFormsRepository(codecs, masterFormRepository);
using (AutoFormsEngine engine = new AutoFormsEngine(repository, ocrEngine, null, AutoFormsRecognitionManager.Default | AutoFormsRecognitionManager.Ocr, 30, 80, false))
{
//loop through all of the files in the directory of filled forms
foreach (var file in Directory.EnumerateFiles(filledFormDirectory))
{
Console.WriteLine("Processing file " + Path.GetFileName(file));
using (RasterImage image = codecs.Load(file))
{
//Run the recognition
AutoFormsRunResult runResult = engine.Run(image, null, null, null);
Console.WriteLine("Form Processed using " + runResult.RecognitionResult.MasterForm.Name);
//Process the results - this will jsut display all OMR fields found and output True or False to the console
if (runResult != null)
foreach (FormPage formPage in runResult.FormFields)
foreach (FormField field in formPage)
if ((field as OmrFormField) != null)
Console.WriteLine(field.Name + ": " + ((field.Result as OmrFormFieldResult)?.Text == "1").ToString());
}
Console.WriteLine("*****************************");
}
}
}
Console.WriteLine("Done processing");
Console.ReadLine();
}
Hadi Chami
Developer Support Manager
LEAD Technologies, Inc.
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LEADTOOLS Support
Document
Document SDK Examples
HOW TO: Create a simple OMR processing forms demo
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