LeastSquareSphere3d

least square sphere associated to shape tops More...

Classes
class	ipsdk::imaproc::shape::analysis::LeastSquareSphere3dMsr
	Measurement object for measure LeastSquareSphere3d. More...
class	ipsdk::imaproc::shape::analysis::LeastSquareSphere3dMsrInfo
	Information object for measure LeastSquareSphere3d. More...

Typedefs
typedef attr::RobustEstimationConfig	ipsdk::imaproc::shape::analysis::LeastSquareSphere3dMsrParams
	parameters type associated to measure

Detailed Description

least square sphere associated to shape tops

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

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

Estimated sphere 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 LeastSquareCircle2d for an example of least square approximation in the 2d case of circle.

Author

E.Noirfalise

Date

2017/05/23

Copyright

2017 Reactiv'IP, all right reserved.

least square sphere associated to shape tops

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Geometry 3d	None	LeastSquareSphere3dMsrParams	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 LeastSquareSphere3d is not associated to any unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_NoUnit]

Measure Parameter Type :

Measure LeastSquareSphere3d is associated to LeastSquareSphere3dMsrParams parameters

Measure Result Type :

Measure LeastSquareSphere3d is associated to LeastSquareSphere3dMsrResults results

Measure Shape Requirements :

Measure LeastSquareSphere3d requires boundary approximation from shape data

Measure Dependencies :

Measure LeastSquareSphere3d 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, "LeastSquareSphere3dMsr")
    
    #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("LeastSquareSphere3dMsr")
    
    # retrieve measure values
    outMsrValues = outMsr.getMeasureResult().getColl(0)
    print("First label measurement equal " + str(outMsrValues[1].first))

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, "LeastSquareSphere3dMsr");
    
    // compute measure on shape 3d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis3d(pInGreyImg3d, pShape3dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pLeastSquareSphere3dOutMsr = pOutMeasureSet->getMeasure("LeastSquareSphere3dMsr");
    const LeastSquareSphere3dMsrResults& outResults = static_cast<const LeastSquareSphere3dMsrResults&>(pLeastSquareSphere3dOutMsr->getMeasureResult());