Определение и распознавание документа, содержащего заполненную форму с OMR-метками
В этом разделе
Если вы хотите определить и распознать документ, содержащий заполненную форму с OMR-полями, вам необходимо выполнить следующие шаги:
- Определить шаблон для заполненной формы
- Распознать значения полей в заполненной форме
Вот C#/VB.NET код, демонстрирующий, как идентифицировать и распознать заполненную форму, содержащую OMR-метки.
/// <summary>
/// Recognizes the form with OMR fields.
/// </summary>
/// <param name="formRecognitionManager">The form recognition manager.</param>
/// <param name="image">The image.</param>
public static void RecognizeFormWithOmrFields(
Vintasoft.Imaging.FormsProcessing.FormRecognitionManager formRecognitionManager,
Vintasoft.Imaging.VintasoftImage image)
{
// if your form template contains OCR fields,
// make sure OCR engine manager is initialized before recognition
// (otherwise recognition will return null (Nothing)),
// see OCR field recognition examples
// recognize filled form in an image
Vintasoft.Imaging.FormsProcessing.FormRecognitionResult recognitionResult =
formRecognitionManager.Recognize(image);
// get the result of image comparison
Vintasoft.Imaging.FormsProcessing.TemplateMatching.ImageImprintCompareResult imageCompareResult =
recognitionResult.TemplateMatchingResult.ImageCompareResult;
// if result is not reliable
if (!imageCompareResult.IsReliable)
{
// matching template is not found
System.Console.WriteLine("Matching template is not found.");
}
else
{
// get recognized page
Vintasoft.Imaging.FormsProcessing.FormRecognition.FormPage recognizedPage =
recognitionResult.RecognizedPage;
// get form field count
if (recognizedPage.Items.Count == 0)
{
System.Console.WriteLine("No form fields were recognized.");
}
else
{
System.Console.WriteLine(string.Format(
"Recognized form field count: {0}",
recognizedPage.Items.Count));
// for each recognized form field
foreach (Vintasoft.Imaging.FormsProcessing.FormRecognition.FormField recognizedField in recognizedPage.Items)
{
if (recognizedField is Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrField)
{
Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrField omrField =
(Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrField)recognizedField;
// write field info
System.Console.WriteLine(string.Format(
" OMR field: name: {0}; state: {1}; confidence: {2:F1}%",
omrField.Name,
omrField.State,
omrField.Confidence * 100));
}
}
}
}
}
''' <summary>
''' Recognizes the form with OMR fields.
''' </summary>
''' <param name="formRecognitionManager">The form recognition manager.</param>
''' <param name="image">The image.</param>
Public Shared Sub RecognizeFormWithOmrFields(formRecognitionManager As Vintasoft.Imaging.FormsProcessing.FormRecognitionManager, image As Vintasoft.Imaging.VintasoftImage)
' if your form template contains OCR fields,
' make sure OCR engine manager is initialized before recognition
' (otherwise recognition will return null (Nothing)),
' see OCR field recognition examples
' recognize filled form in an image
Dim recognitionResult As Vintasoft.Imaging.FormsProcessing.FormRecognitionResult = formRecognitionManager.Recognize(image)
' get the result of image comparison
Dim imageCompareResult As Vintasoft.Imaging.FormsProcessing.TemplateMatching.ImageImprintCompareResult = recognitionResult.TemplateMatchingResult.ImageCompareResult
' if result is not reliable
If Not imageCompareResult.IsReliable Then
' matching template is not found
System.Console.WriteLine("Matching template is not found.")
Else
' get recognized page
Dim recognizedPage As Vintasoft.Imaging.FormsProcessing.FormRecognition.FormPage = recognitionResult.RecognizedPage
' get form field count
If recognizedPage.Items.Count = 0 Then
System.Console.WriteLine("No form fields were recognized.")
Else
System.Console.WriteLine(String.Format("Recognized form field count: {0}", recognizedPage.Items.Count))
' for each recognized form field
For Each recognizedField As Vintasoft.Imaging.FormsProcessing.FormRecognition.FormField In recognizedPage.Items
If TypeOf recognizedField Is Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrField Then
Dim omrField As Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrField = DirectCast(recognizedField, Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrField)
' write field info
System.Console.WriteLine(String.Format(" OMR field: name: {0}; state: {1}; confidence: {2:F1}%", omrField.Name, omrField.State, omrField.Confidence * 100))
End If
Next
End If
End If
End Sub
Вот C#/VB.NET код, демонстрирующий, как идентифицировать и распознать заполненную форму, содержащую пузырьковый лист (группу OMR-меток).
/// <summary>
/// Recognizes the form with a group of marks (OMR bubbles).
/// </summary>
/// <param name="formRecognitionManager">The form recognition manager.</param>
/// <param name="image">The image.</param>
public static void RecognizeFormWithOmrFieldTables(
Vintasoft.Imaging.FormsProcessing.FormRecognitionManager formRecognitionManager,
Vintasoft.Imaging.VintasoftImage image)
{
// if your form template contains OCR fields,
// make sure OCR engine manager is initialized before recognition
// (otherwise recognition will return null (Nothing)),
// see OCR field recognition examples
// recognize filled form in an image
Vintasoft.Imaging.FormsProcessing.FormRecognitionResult recognitionResult =
formRecognitionManager.Recognize(image);
// get the result of image comparison
Vintasoft.Imaging.FormsProcessing.TemplateMatching.ImageImprintCompareResult imageCompareResult =
recognitionResult.TemplateMatchingResult.ImageCompareResult;
// if result is not reliable
if (!imageCompareResult.IsReliable)
{
// matching template is not found
System.Console.WriteLine("Matching template is not found.");
}
else
{
// get recognized page
Vintasoft.Imaging.FormsProcessing.FormRecognition.FormPage recognizedPage =
recognitionResult.RecognizedPage;
// get form field count
if (recognizedPage.Items.Count == 0)
{
System.Console.WriteLine("No form fields were recognized.");
}
else
{
System.Console.WriteLine(string.Format(
"Recognized form field count: {0}",
recognizedPage.Items.Count));
// for each recognized form field
foreach (Vintasoft.Imaging.FormsProcessing.FormRecognition.FormField recognizedField in recognizedPage.Items)
{
if (recognizedField is Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTable)
{
Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTable omrFieldTable =
(Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTable)recognizedField;
Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTemplateTable omrTemplateTable =
omrFieldTable.FieldTemplate as Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTemplateTable;
// write field info
System.Console.WriteLine(string.Format(
" OMR field table: name: {0}; value: {1}; confidence: {2:F1}%; row count: {3}; column count: {4}",
omrFieldTable.Name,
omrFieldTable.Value,
omrFieldTable.Confidence * 100,
omrTemplateTable.RowCount,
omrTemplateTable.ColumnCount));
}
}
}
}
}
''' <summary>
''' Recognizes the form with a group of marks (OMR bubbles).
''' </summary>
''' <param name="formRecognitionManager">The form recognition manager.</param>
''' <param name="image">The image.</param>
Public Shared Sub RecognizeFormWithOmrFieldTables(formRecognitionManager As Vintasoft.Imaging.FormsProcessing.FormRecognitionManager, image As Vintasoft.Imaging.VintasoftImage)
' if your form template contains OCR fields,
' make sure OCR engine manager is initialized before recognition
' (otherwise recognition will return null (Nothing)),
' see OCR field recognition examples
' recognize filled form in an image
Dim recognitionResult As Vintasoft.Imaging.FormsProcessing.FormRecognitionResult = formRecognitionManager.Recognize(image)
' get the result of image comparison
Dim imageCompareResult As Vintasoft.Imaging.FormsProcessing.TemplateMatching.ImageImprintCompareResult = recognitionResult.TemplateMatchingResult.ImageCompareResult
' if result is not reliable
If Not imageCompareResult.IsReliable Then
' matching template is not found
System.Console.WriteLine("Matching template is not found.")
Else
' get recognized page
Dim recognizedPage As Vintasoft.Imaging.FormsProcessing.FormRecognition.FormPage = recognitionResult.RecognizedPage
' get form field count
If recognizedPage.Items.Count = 0 Then
System.Console.WriteLine("No form fields were recognized.")
Else
System.Console.WriteLine(String.Format("Recognized form field count: {0}", recognizedPage.Items.Count))
' for each recognized form field
For Each recognizedField As Vintasoft.Imaging.FormsProcessing.FormRecognition.FormField In recognizedPage.Items
If TypeOf recognizedField Is Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTable Then
Dim omrFieldTable As Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTable = DirectCast(recognizedField, Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTable)
Dim omrTemplateTable As Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTemplateTable = TryCast(omrFieldTable.FieldTemplate, Vintasoft.Imaging.FormsProcessing.FormRecognition.Omr.OmrFieldTemplateTable)
' write field info
System.Console.WriteLine(String.Format(" OMR field table: name: {0}; value: {1}; confidence: {2:F1}%; row count: {3}; column count: {4}", omrFieldTable.Name, omrFieldTable.Value, omrFieldTable.Confidence * 100, omrTemplateTable.RowCount, omrTemplateTable.ColumnCount))
End If
Next
End If
End If
End Sub