multi-scale hessian-based measure 參數設定
Post on 30-Dec-2015
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Multi-Scale Hessian-Based Measure參數設定
Wei –Lu Lin
Outline
•MultiScaleHessianBasedMeasureImageFilter
• HessianToObjectnessMeasureImageFilter
• Example( Vessels case :IM065.dcm)
Itk:: MultiScaleHessianBasedMeasureImag
eFilter• A filter to enhance structures using Hessian
eigensystem-based measures in a multiscale framework
• SetSigmaMinimum
• Set/Get macros for SigmaMin
• SetSigmaMaximum
• Set/Get macros for SigmaMax
• SetNumberOfSigmaSteps
• Set/Get macros for Number of Scales
Itk::HessianToObjectnessMeasureImageFilter
• A filter to enhance M-dimensional objects in N-dimensional images
• SetAlpha
• SetBeta
• SetGamma
• SetAlpha
• Set/Get Alpha, the weight corresponding to R_A (the ratio of the smallest eigenvalue that has to be large to the larger ones). Smaller values lead to increased sensitivity to the object dimensionality
Itk::HessianToObjectnessMeasureImageFilter
• SetBeta
• Set/Get Beta, the weight corresponding to R_B (the ratio of the largest eigenvalue that has to be small to the larger ones). Smaller values lead to increased sensitivity to the object dimensionality
Itk::HessianToObjectnessMeasureImageFilter
• SetGamma
• Set/Get Gamma, the weight corresponding to S (the Frobenius norm of the Hessian matrix, or second-order structureness)
Itk::HessianToObjectnessMeasureImageFilter
Example
• sigmaMinimum = 2.0
• sigmaMaximum = 3.0
• numberOfSigmaSteps = 1
• Alpha = 0.5
• Beta = 0.5
• Gamma = 5.0Vessel case :IM065.dcm
Example
• Tune the sigmaMinimum and sigmaMaximum
sigmaMinimum = 2.0 sigmaMaximum = 3.0
sigmaMinimum = 10.0 sigmaMaximum = 11.0
Example
• Tune the numberOfSigmaSteps
numberOfSigmaSteps = 1
numberOfSigmaSteps = 10
Example• Tune the Alpha
Alpha = 0.5 Alpha = 10.0
Example• Tune the Beta
Beta = 0.5 Beta = 10.0
Example
• Tune the Gamma
Gamma = 5.0 Gamma = 2.0
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