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This method detects text orientation on the image. The method returns TextOrientation object, if orientation has been detected successfully, and NULL, if the program failed to detect orientation.

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Syntax

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C++

HRESULT DetectOrientation(
  IObjectsExtractionParams*    ExtractionParams,
  IRecognizerParams*           RecognizerParams,
  ITextOrientation**           Result
);

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C#

ITextOrientation DetectOrientation(
  IObjectsExtractionParams    ExtractionParams,
  IRecognizerParams           RecognizerParams
);

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Visual Basic .NET

Function DetectOrientation( _
  [ExtractionParams As IObjectsExtractionParams = Nothing], _
  [RecognizerParams As IRecognizerParams = Nothing] _
) As ITextOrientation

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Parameters

ExtractionParams [in] This variable refers to the ObjectsExtractionParams object that stores parameters of objects extraction. This parameter may be 0. In this case, the objects are extracted with default parameters, or, if a profile has been loaded, the parameters set by this profile are used. RecognizerParams [in] This variable refers to the RecognizerParams object that stores parameters of page recognition. This parameter may be 0. In this case, the default parameters are used, or, if a profile has been loaded, the parameters set by this profile are used. Result [out, retval] A pointer to ITextOrientation* pointer variable that receives the interface pointer of the TextOrientation output object. This object provides access to the text orientation on the page. If orientation detection failed, NULL is returned.

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Return values

This method has no specific return values. It returns the standard return values of ABBYY FineReader Engine functions.

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Samples

FREngine.IFRDocument frdoc;
// We presume that the document has been created and images have been added to it
// Get orientation of every page in the document
int pagesCount = frDoc.Pages.Count;
FREngine.RotationTypeEnum[] rotations = new FREngine.RotationTypeEnum[pagesCount];
for (int i = 0; i < pagesCount; i++)
{
 FREngine.IFRPage page = frDoc.Pages[i];
 FREngine.ITextOrientation ori = page.DetectOrientation(null, null);
 rotations[i] = FREngine.RotationTypeEnum.RT_UnknownRotation;
 if( ori != null ) {
  rotations[i] = ori.RotationType;
 }
}

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See also

FRPage IPagePreprocessingParams::CorrectOrientationMode Working with Profiles