Porosity

Material porosity measurement : fraction of the volume of voids over the total volume. More...

Classes
class	ipsdk::imaproc::shape::analysis::PorosityMsr
	Measurement object for measure Porosity. More...
class	ipsdk::imaproc::shape::analysis::PorosityMsrInfo
	Information object for measure Porosity. More...

Detailed Description

Material porosity measurement : fraction of the volume of voids over the total volume.

Porosity or void fraction is a measure of the void spaces in a material.

Porosity measure values are included in :

• 0 for a full particle (0 void)
• 1 for an empty particle

Porosity measure is given by :

• In 2d case :

  

• In 3d case :

  

Here is an example of porosity measurement in 2d case :

See also

https://en.wikipedia.org/wiki/Porosity

Author

E. Noirfalise

Date

2015/07/10

Copyright

2015 Reactiv'IP, all right reserved.

Material porosity measurement : fraction of the volume of voids over the total volume

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Generic	None	None	Value (ipsdk::ipReal64)	Boundary Approximation

See Shape measurement for additional information on these pictograms

Measure Type :

This is a generic measure

• it does not directly use shape or image data
• it can use dependencies to other measures to compute a result (see Measure Dependencies section)

This measure can be used in 2d and 3d case

Measure Unit Type:

Measure Porosity is not associated to any unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_NoUnit]

Measure Parameter Type :

Measure Porosity has no parameters

Measure Result Type :

Measure Porosity is associated to ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64> results

Measure Shape Requirements :

Measure Porosity requires boundary approximation from shape data

Measure Dependencies :

Measure Porosity depends on following measures :

Measure Mode	Measure Name	Measure Type	Measure Parameters
eMVP_2d	TotalValue	PolygonArea2d	createHolesBasicPolicyMsrParams(false)
eMVP_3d	TotalValue	MeshVolume3d	createHolesBasicPolicyMsrParams(false)
eMVP_2d	ValueMinusVoids	PolygonArea2d	createHolesBasicPolicyMsrParams(true)
eMVP_3d	ValueMinusVoids	MeshVolume3d	createHolesBasicPolicyMsrParams(true)

Note

See Shape Analysis 2d for more information on general shape 2d analysis and measurement usage.

See Shape Analysis 3d for more information on general shape 3d analysis and measurement usage.

Example of Python code :

Generic example in 2d case :

import PyIPSDK
import PyIPSDK.IPSDKIPLShapeAnalysis as shapeanalysis

    # Create the infoset
    inMeasureInfoSet2d = PyIPSDK.createMeasureInfoSet2d()
    PyIPSDK.createMeasureInfo(inMeasureInfoSet2d, "PorosityMsr")
    
    #Perform the analysis
    outMeasureSet = shapeanalysis.labelAnalysis2d(inGreyImg, inLabelImg2d, inMeasureInfoSet2d)
    
    # save results to csv format
    PyIPSDK.saveCsvMeasureFile(os.path.join(tmpPath,  "shape_analysis_results.csv"), outMeasureSet)
    
    # retrieve measure results
    outMsr = outMeasureSet.getMeasure("PorosityMsr")
    
    # retrieve measure values
    outMsrValues = outMsr.getMeasureResult().getColl(0)
    print("First label measurement equal " + str(outMsrValues[1]))

Generic example in 3d case :

import PyIPSDK
import PyIPSDK.IPSDKIPLShapeAnalysis as shapeanalysis

    # Create the infoset
    inMeasureInfoSet3d = PyIPSDK.createMeasureInfoSet3d()
    PyIPSDK.createMeasureInfo(inMeasureInfoSet3d, "PorosityMsr")
    
    #Perform the analysis
    outMeasureSet = shapeanalysis.labelAnalysis3d(inGreyImg, inLabelImg, inMeasureInfoSet3d)
    
    # save results to csv format
    PyIPSDK.saveCsvMeasureFile(os.path.join(tmpPath,  "shape_analysis_results.csv"), outMeasureSet)
    
    # retrieve measure results
    outMsr = outMeasureSet.getMeasure("PorosityMsr")
    
    # retrieve measure values
    outMsrValues = outMsr.getMeasureResult().getColl(0)
    print("First label measurement equal " + str(outMsrValues[1]))

Example of C++ code :

Example informations

Associated library

IPSDKIPLShapeAnalysis

Code Example

    // opening grey level input image
    ImagePtr pInGreyImg2d = loadTiffImageFile(inputGreyImgPath);

    // read entity shape 2d collection used for processing
    Shape2dCollPtr pShape2dColl = boost::make_shared<Shape2dColl>();
    readFromXmlFile(inputShape2dCollPath, *pShape2dColl);

    // define a measure info set
    MeasureInfoSetPtr pMeasureInfoSet = MeasureInfoSet::create2dInstance();
    createMeasureInfo(pMeasureInfoSet, "PorosityMsr");
    
    // compute measure on shape 2d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis2d(pInGreyImg2d, pShape2dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pPorosityOutMsr = pOutMeasureSet->getMeasure("PorosityMsr");
    const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64>& outResults = static_cast<const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64>&>(pPorosityOutMsr->getMeasureResult());