[Insight-users] About Examples/Segmentation/FastMarchingImageFIlter.cxx

[diaoxianfen]

In this exmaple,itk::BinaryThresholdImageFilter is used.I think this class is used to cast the pixel value to 1 or 255.The method SetLowerThreshold(...),SetUpperThreshold(...)are used to set the range to distinguish the foreground from background.But there are 
sentence as follows:
typedef itk::BinaryThresholdImageFilter< InternalImageType, 
                        OutputImageType    >    ThresholdingFilterType;
  ThresholdingFilterType::Pointer thresholder = ThresholdingFilterType::New();
  
  //const InternalPixelType  timeThreshold = TimeThreshold; 
  thresholder->SetLowerThreshold(0.0);
  thresholder->SetUpperThreshold(timeThreshold)

In the ItkSoftwareGuide.pdf page 367/565,the sentence is as follows.
The upper threshold passed to the BinaryThresholdImageFilter will define the time snapshot that we are taking from the time-crossing map.
Does the "timeThreshold" parameter have the time means?Or it should be a value among the pixel value of the image?
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