/// <summary>
/// Apply ocr settings
/// </summary>
/// <param name="ocr"></param>
/// <param name="options"></param>
private void ApplySettings(GdPictureOCR ocr, OCROption options)
{
if (string.IsNullOrWhiteSpace(options.ResourceFolder))
{
options.ResourceFolder = GdPictureHelper.OCRDirectory;
}
ocr.Context = (GdPicture14.OCRContext)(int) options.Context;
ocr.LanguageModelPenaltyNonDictWords = 0.15f;
ocr.LanguageModelPenaltyNonFreqDictWords = 0.1f;
ocr.ResourceFolder = options.ResourceFolder;
ocr.LoadMainDictionary = options.UseMainDictionary;
ocr.LoadFreqWordsDictionary = options.UseFreqWordsDictionary;
ocr.EnableOrientationDetection = options.EnableOrientationDetection;
ocr.EnableSkewDetection = options.EnableSkewDetection;
ocr.ResetSelectedDictionaries();
if (options.Languages != null)
{
foreach (var language in options.Languages)
{
ocr.AddLanguage((GdPicture14.OCRLanguage)(int) language);
}
}
else
{
//using german by default.
ocr.AddLanguage(GdPicture14.OCRLanguage.German);
}
ocr.OCRMode = (GdPicture14.OCRMode)(int) options.Mode;
ocr.CharacterSet = options.CharacterSet;
if (options.Left != 0 && options.Top != 0 && options.Width != 0 && options.Height != 0)
{
ocr.SetROI(options.Left, options.Top, options.Width, options.Height);
}
else
{
ocr.ResetROI();
}
}
public OCRResult ExtractText(OCROption options)
{
using (var ocr = GdPictureHelper.GetOCRInstance())
{
try
{
var result = new OCRResult();
var contentBuilder = new StringBuilder();
ocr.SetImage(imageId);
ApplySettings(ocr, options ?? DefaultOptions);
var pages = new List <int>();
if (options.Pages.Count == 0)
{
for (int i = 1; i <= PageCount; i++)
{
pages.Add(i);
}
}
else
{
pages.AddRange(options.Pages);
}
foreach (var page in pages)
{
GdPictureStatus status;
if (isMultipageImage)
{
status = imaging.TiffSelectPage(imageId, page);
}
else
{
status = imaging.SelectPage(imageId, page);
}
if (status != GdPictureStatus.OK)
{
result.ErrorOccured = true;
result.ErrorMessages.Add($"Error during page selection. Page: {page}");
continue;
}
if (ocr.SetImage(imageId) != GdPictureStatus.OK)
{
result.ErrorOccured = true;
result.ErrorMessages.Add($"Error during setting image. Page: {page}");
continue;
}
var resultId = ocr.RunOCR();
string text = ocr.GetOCRResultText(resultId);
// Add result
var regionResult = new OCRRegionResult
{
OptionName = options.OptionName,
Height = options.Height,
Left = options.Left,
Page = page,
Top = options.Top,
Width = options.Width,
Text = text
};
result.RegionResults.Add(regionResult);
contentBuilder.AppendLine(text);
}
result.Text = contentBuilder.ToString();
ocr.ReleaseOCRResults();
return(result);
}
catch (Exception ex)
{
ocr.ReleaseOCRResults();
return(new OCRResult
{
Text = "",
ErrorMessages = new[] { ex.Message },
ErrorOccured = true
});
}
}
}
