// Detect orientation of all pages in a document
// Return array with orientations for all pages
private FREngine.RotationTypeEnum[] detectOrientation(string imagePath, FREngine.PrepareImageMode _prepareImageMode,
FREngine.PageProcessingParams pageProcessingParams)
{
// Correct skew during loading
FREngine.PrepareImageMode prepareImageMode = engine.CreatePrepareImageMode();
prepareImageMode.CopyFrom(_prepareImageMode);
prepareImageMode.CorrectSkew = true;
prepareImageMode.CorrectSkewMode = correctSkewFlags;
FREngine.RotationTypeEnum[] rotations = null;
FREngine.FRDocument frDocument = engine.CreateFRDocument();
try
{
frDocument.AddImageFile(imagePath, prepareImageMode, null);
// Get orientation for every page
int pagesCount = frDocument.Pages.Count;
rotations = new FREngine.RotationTypeEnum[pagesCount];
for (int pageIndex = 0; pageIndex < pagesCount; pageIndex++)
{
FREngine.IFRPage frPage = frDocument.Pages[pageIndex];
FREngine.TextOrientation textOrientation = frPage.DetectOrientation(null, pageProcessingParams.ObjectsExtractionParams,
pageProcessingParams.RecognizerParams);
rotations[pageIndex] = FREngine.RotationTypeEnum.RT_UnknownRotation;
if (textOrientation != null)
{
rotations[pageIndex] = textOrientation.RotationType;
}
frPage.Flush(false);
}
}
finally
{
frDocument.Close();
}
return(rotations);
}
private void applyGeometricalTransformations(FREngine.IFRPage page, FREngine.IPageProcessingParams ppp, ProcessingSettings settings,
FREngine.RotationTypeEnum detectedRotation)
{
checkProcessingSettingsForImage(page.ImageDocument.ImageColorType, ref settings);
if (settings.CropImage)
{
page.ImageDocument.CropImage();
}
if (settings.EnhanceLocalContrast)
{
page.ImageDocument.EnhanceLocalContrast();
}
if (settings.CorrectOrientationMode != ProcessingSettings.OrientationCorrectionMode.None && detectedRotation != FREngine.RotationTypeEnum.RT_NoRotation)
{
FREngine.RotationTypeEnum rotation = FREngine.RotationTypeEnum.RT_NoRotation;
bool mirror = false;
if (detectedRotation != FREngine.RotationTypeEnum.RT_UnknownRotation)
{
switch (detectedRotation)
{
case FREngine.RotationTypeEnum.RT_Clockwise:
rotation = FREngine.RotationTypeEnum.RT_Counterclockwise;
break;
case FREngine.RotationTypeEnum.RT_Upsidedown:
rotation = FREngine.RotationTypeEnum.RT_Upsidedown;
break;
case FREngine.RotationTypeEnum.RT_Counterclockwise:
rotation = FREngine.RotationTypeEnum.RT_Clockwise;
break;
default:
break;
}
}
else
{
switch (settings.CorrectOrientationMode)
{
case ProcessingSettings.OrientationCorrectionMode.Rotate90CW:
rotation = FREngine.RotationTypeEnum.RT_Clockwise;
break;
case ProcessingSettings.OrientationCorrectionMode.Rotate180UpsideDown:
rotation = FREngine.RotationTypeEnum.RT_Upsidedown;
break;
case ProcessingSettings.OrientationCorrectionMode.Rotate90CCW:
rotation = FREngine.RotationTypeEnum.RT_Counterclockwise;
break;
case ProcessingSettings.OrientationCorrectionMode.MirrorHorizontally:
mirror = true;
break;
default:
break;
}
}
page.ImageDocument.Transform(rotation, mirror, false);
}
if (settings.InvertImage)
{
page.ImageDocument.Transform(FREngine.RotationTypeEnum.RT_NoRotation, false, true);
}
if (settings.CorrectDistortions)
{
page.CorrectGeometricalDistortions(ppp.ObjectsExtractionParams);
}
if (settings.DeskewImage)
{
page.ImageDocument.CorrectSkew(correctSkewFlags);
}
}
public RecognitionStatistics Process(string imagePath, ProcessingSettings settings)
{
DateTime startTime = System.DateTime.Now;
setStep("Applying profile...");
engine.LoadPredefinedProfile("DocumentConversion_Accuracy");
setStep("Applying settings...");
FREngine.PrepareImageMode pim = engine.CreatePrepareImageMode();
FREngine.DocumentProcessingParams dpp = engine.CreateDocumentProcessingParams();
FREngine.PageProcessingParams ppp = dpp.PageProcessingParams;
ppp.RecognizerParams.SetPredefinedTextLanguage(settings.Language);
disableAllModifications(pim, ppp);
pim.AutoOverwriteResolution = false;
if (settings.CorrectResolution)
{
if (settings.NewResolution == 0)
{
pim.AutoOverwriteResolution = true;
}
else if (settings.NewResolution > 0)
{
pim.OverwriteResolution = true;
pim.XResolutionToOverwrite = settings.NewResolution;
pim.YResolutionToOverwrite = settings.NewResolution;
}
}
if (settings.ConvertToBW)
{
pim.DiscardColorImage = true;
}
if (settings.DeskewImage)
{
pim.CorrectSkew = true;
}
// Detect orientation for all pages
setStep("Detecting orientation...");
FREngine.RotationTypeEnum[] rotation = null;
if (settings.CorrectOrientationMode == ProcessingSettings.OrientationCorrectionMode.Automatic)
{
rotation = detectOrientation(imagePath, pim, ppp);
}
setStep("Loading image...");
// Create document
FREngine.FRDocument frDocument = engine.CreateFRDocument();
RecognitionStatistics recognitionStats = new RecognitionStatistics();
try
{
// Add image file to document
frDocument.AddImageFile(imagePath, pim, null);
if (frDocument.Pages.Count == 0)
{
throw new Exception("No pages in a file");
}
setStep("Performing image modification...");
for (int pageIndex = 0; pageIndex < frDocument.Pages.Count; pageIndex++)
{
FREngine.IFRPage frPage = frDocument.Pages[pageIndex];
FREngine.RotationTypeEnum pageRotation = FREngine.RotationTypeEnum.RT_UnknownRotation;
if (rotation != null && pageIndex < rotation.Length)
{
pageRotation = rotation[pageIndex];
}
applyGeometricalTransformations(frPage, ppp, settings, pageRotation);
GC.Collect();
GC.WaitForPendingFinalizers();
frPage.Flush(true);
}
int[] sourcePageIndices = splitImage(frDocument, ppp, settings);
for (int pageIndex = 0; pageIndex < frDocument.Pages.Count; pageIndex++)
{
FREngine.IFRPage frPage = frDocument.Pages[pageIndex];
applyImageTransformations(frPage, settings);
GC.Collect();
GC.WaitForPendingFinalizers();
frPage.Flush(true);
}
if (settings.IsRecognize)
{
setStep("Recognizing image...");
frDocument.Process(dpp);
}
setStep("Applying visual enhancements...");
for (int pageIndex = 0; pageIndex < frDocument.Pages.Count; pageIndex++)
{
FREngine.IFRPage frPage = frDocument.Pages[pageIndex];
applyVisualEnhancements(frPage, settings);
GC.Collect();
GC.WaitForPendingFinalizers();
frPage.Flush(true);
}
TimeSpan processingTime = DateTime.Now - startTime;
setStep("Computing statistics...");
recognitionStats = computeStatistics(frDocument);
recognitionStats.TotalProcessingTime = processingTime;
recognitionStats.SourcePageIndices = sourcePageIndices;
setStep("Retrieving images...");
for (int pageIndex = 0; pageIndex < frDocument.Pages.Count; pageIndex++)
{
if (recognitionStats.PreprocessedImages == null)
{
recognitionStats.PreprocessedImages = new System.Drawing.Image[frDocument.Pages.Count];
}
FREngine.IFRPage frPage = frDocument.Pages[pageIndex];
recognitionStats.PreprocessedImages[pageIndex] = getImageFromPage(frPage);
GC.Collect();
GC.WaitForPendingFinalizers();
frPage.Flush(false);
}
//frDocument.Export(AppDomain.CurrentDomain.BaseDirectory + "FileSample2.xml", FREngine.FileExportFormatEnum.FEF_XML, null);
//frDocument.Export(AppDomain.CurrentDomain.BaseDirectory + "FileSample2.txt", FREngine.FileExportFormatEnum.FEF_TextUnicodeDefaults, null);
}
finally
{
frDocument.Close();
}
return(recognitionStats);
}
