Inertia3dOrientationAlpha

Measure allowing to compute the shape orientation (alpha component) from the second order moment matrix computed from the Inertia3d measurement for 3d shape. More...

Classes
class	ipsdk::imaproc::shape::analysis::Inertia3dOrientationAlphaMsr
	Measurement object for measure InertiaOrientationAlpha. More...

Detailed Description

Measure allowing to compute the shape orientation (alpha component) from the second order moment matrix computed from the Inertia3d measurement for 3d shape.

This measure computes the orientation value of the inertia matrix calculated for each shape, without taking the voxels intensities into account, and returns the alpha component, expressed in radians.

Here is an example of alpha orientation measurement :

See Inertia3d for more details about the inertia calculation.

Author

H. Delestre

Date

2016/03/25

Copyright

2016 Reactiv'IP, all right reserved.

Measure allowing to compute the 3d shape orientation (alpha component) from the second order moment matrix computed from the Inertia2d measurement for 3d shape

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Generic	Angle	None	Value (ipsdk::ipReal64)	Row Intersections

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 only be used in 3d case

Measure Unit Type:

Measure Inertia3dOrientationAlpha is associated to an angular (radians) measurement unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_RadianUnit]

Measure Parameter Type :

Measure Inertia3dOrientationAlpha has no parameters

Measure Result Type :

Measure Inertia3dOrientationAlpha is associated to ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64> results

Measure Shape Requirements :

Measure Inertia3dOrientationAlpha requires row intersections from shape data

Measure Dependencies :

Measure Inertia3dOrientationAlpha depends on following measures :

Measure Mode	Measure Name	Measure Type	Measure Parameters
eMVP_3d	Inertia	Inertia3d

Note

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

Example of Python code :

Generic example in 3d case :

import PyIPSDK
import PyIPSDK.IPSDKIPLShapeAnalysis as shapeanalysis

    # Create the infoset
    inMeasureInfoSet3d = PyIPSDK.createMeasureInfoSet3d()
    PyIPSDK.createMeasureInfo(inMeasureInfoSet3d, "Inertia3dOrientationAlphaMsr")
    
    #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("Inertia3dOrientationAlphaMsr")
    
    # 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 pInGreyImg3d = loadTiffImageFile(inputGreyImgPath, eTiffDirectoryMode::eTDM_Volume);

    // read entity shape 3d collection used for processing
    Shape3dCollPtr pShape3dColl = boost::make_shared<Shape3dColl>();
    readFromBinaryFile(inputShape3dCollPath, *pShape3dColl);

    // define a measure info set
    MeasureInfoSetPtr pMeasureInfoSet = MeasureInfoSet::create3dInstance();
    createMeasureInfo(pMeasureInfoSet, "Inertia3dOrientationAlphaMsr");
    
    // compute measure on shape 3d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis3d(pInGreyImg3d, pShape3dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pInertia3dOrientationAlphaOutMsr = pOutMeasureSet->getMeasure("Inertia3dOrientationAlphaMsr");
    const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64>& outResults = static_cast<const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64>&>(pInertia3dOrientationAlphaOutMsr->getMeasureResult());