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This method applies a noise reducing filter to the image. It is mostly useful for photographs. We recommend experimenting on typical input images to find the parameter values which would work best for you, starting with Radius equal to 15 and Threshold equal to 3.0.

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Syntax

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C++

HRESULT ApplySigmaFilter(
  int    Radius,
  double Threshold
);

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C#

void ApplySigmaFilter(
  int    Radius,
  double Threshold
);

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Visual Basic .NET

Sub ApplySigmaFilter( _
  Radius As Integer, _
  Threshold As Double _
)

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Parameters

Radius [in] The smoothing radius. Should be in the range from 15 to 30. Threshold [in] The noise intensity threshold. Should be in the range from 3 to 5.

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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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See also

ImageDocument