[Insight-users] xxxxxSPAMxxxxx Why the result of itk::MattesMutualInformationImageToImageMetric is negated?

[水灵]

Hello!
  
 The last line of the GetValue() method in itkMattesMutualInformationImageToImageMetric.txx. It reads : return static_cast<MeasureType>( -1.0 * sum );
why not : return static_cast<MeasureType>( sum ) ? Yet in other MI metric it's positive.
  
 thank you!
  
 Ling Luo
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