void Magick::Image::adaptiveThreshold(const size_t width_,const size_t height_,
   const double bias_)
{

  MagickCore::Image
    *newImage;

  GetPPException;
  newImage=AdaptiveThresholdImage(constImage(),width_,height_,bias_,
    exceptionInfo);
  replaceImage(newImage);
  ThrowImageException;
}
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