LeastSquareEllipsoid3d

least square ellipsoid associated to shape tops More...

Classes
class	ipsdk::imaproc::shape::analysis::LeastSquareEllipsoid3dMsr
	Measurement object for measure LeastSquareEllipsoid3d. More...
class	ipsdk::imaproc::shape::analysis::LeastSquareEllipsoid3dMsrInfo
	Information object for measure LeastSquareEllipsoid3d. More...
class	ipsdk::imaproc::shape::analysis::LeastSquareEllipsoid3dMsrResults
	Measurement results object for measure LeastSquareEllipsoid3d. More...

Typedefs
typedef attr::RobustEstimationConfig	ipsdk::imaproc::shape::analysis::LeastSquareEllipsoid3dMsrParams
	parameters type associated to measure

Detailed Description

least square ellipsoid associated to shape tops

This measure allows to compute least square ellipsoid associated to each shape.

Given a shape, algorithm will compute a least square ellipsoid approximation of shape tops.

Estimated ellipsoid can be computed using a simple parametric estimation of shape tops or can be computed using a robust estimation technic. This behavior is ruled by measure parameter, see ipsdk::imaproc::attr::RobustEstimationConfig.

For more information on parametric estimation process (including outlier management) please reports to Parametric estimation.

Please refers to LeastSquareEllipse2d for an example of least square approximation in the 2d case of ellipse.

Author

E.Noirfalise

Date

2017/06/09

Copyright

2017 Reactiv'IP, all right reserved.

least square ellipsoid associated to shape tops

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Geometry 3d	None	LeastSquareEllipsoid3dMsrParams	Custom	Boundary Approximation

See Shape measurement for additional information on these pictograms

Measure Type :

This is a geometry 3d measure

• it use shape 3d data to compute a result
• it optionally 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 LeastSquareEllipsoid3d is not associated to any unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_NoUnit]

Measure Parameter Type :

Measure LeastSquareEllipsoid3d is associated to LeastSquareEllipsoid3dMsrParams parameters

Measure Result Type :

Measure LeastSquareEllipsoid3d is associated to LeastSquareEllipsoid3dMsrResults results

Measure Shape Requirements :

Measure LeastSquareEllipsoid3d requires boundary approximation from shape data

Measure Dependencies :

Measure LeastSquareEllipsoid3d has no dependency

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, "LeastSquareEllipsoid3dMsr")
    
    #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("LeastSquareEllipsoid3dMsr")
    
    # retrieve measure values
    outMsrValues = outMsr.getMeasureResult().getColl(0)
    print("First label estimation center : " + str(outMsrValues[1].first.centerX()) + ", " + str(outMsrValues[1].first.centerY()) + ", " + str(outMsrValues[1].first.centerZ()))
    print("First label estimation major radius : " + str(outMsrValues[1].first.getMajorRadius()))
    print("First label estimation medium radius : " + str(outMsrValues[1].first.getMediumRadius()))
    print("First label estimation minor radius : " + str(outMsrValues[1].first.getMinorRadius()))
    print("First label estimation alpha : " + str(outMsrValues[1].first.getAlpha()))
    print("First label estimation beta : " + str(outMsrValues[1].first.getBeta()))
    print("First label estimation chi : " + str(outMsrValues[1].first.getChi()))

Example of C++ code :

Example informations

Associated library

IPSDKIPLShapeAnalysis

Code Example

    // opening grey level input image
    ImagePtr pInGreyImg3d = loadTiffImageFile(inputGreyImgPath);

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

    // define a measure info set
    MeasureInfoSetPtr pMeasureInfoSet = MeasureInfoSet::create3dInstance();
    createMeasureInfo(pMeasureInfoSet, "LeastSquareEllipsoid3dMsr");
    
    // compute measure on shape 3d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis3d(pInGreyImg3d, pShape3dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pLeastSquareEllipsoid3dOutMsr = pOutMeasureSet->getMeasure("LeastSquareEllipsoid3dMsr");
    const LeastSquareEllipsoid3dMsrResults& outResults = static_cast<const LeastSquareEllipsoid3dMsrResults&>(pLeastSquareEllipsoid3dOutMsr->getMeasureResult());