Number of vertex in graph associated to skeleton 2d.

Skeleton 2d number of vertex measure is based on skeleton 2d measure (see [Concept] Skeleton 2d). This measure allows to count number of vertices composing a shape 2d skeleton.

Searched vertex type can be customized (setting measure parameter ipsdk::geom::eSkeletonVertexCategory) :

eSVC_Internal for internal vertex without leaf connection
eSVC_Junction for vertex connected at least to three other vertices (in most of cases this parameter give equivalent results to eSVC_Internal parameter)
eSVC_Slab for vertex connected exactly to two other vertices
eSVC_EndPoint for vertex connected exactly to one other vertice
eSVC_All for all vertices without exception

Here is an example of measure results for different skeleton 2d holes processing policy and different searched vertex types.

Number of vertex in graph associated to skeleton 2d

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Generic	None	Skeleton2dNbVertexMsrParams	Value (ipsdk::ipUInt32)	Boundary Approximation

See Shape measurement for additional information on these pictograms

Example of Python code :

Generic example in 2d case :

import PyIPSDK

import PyIPSDK.IPSDKIPLShapeAnalysis as shapeanalysis

    # Create the infoset
    inMeasureInfoSet2d = PyIPSDK.createMeasureInfoSet2d(PyIPSDK.createGeometricCalibration2d(1,1,'px'))
    PyIPSDK.createMeasureInfo(inMeasureInfoSet2d, "Skeleton2dNbVertexMsr", shapeanalysis.createSkeleton2dNbVertexMsrParams(PyIPSDK.eSHP_Ignored, PyIPSDK.eSVC_All))
    
    #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("Skeleton2dNbVertexMsr")
    
    # 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>();
    IPSDK_REQUIRE(readFromXmlFile(inputShape2dCollPath, *pShape2dColl) == true);
    // define a measure info set
    MeasureInfoSetPtr pMeasureInfoSet = MeasureInfoSet::create2dInstance();
    createMeasureInfo(pMeasureInfoSet, "Skeleton2dNbVertexMsr", createSkeleton2dNbVertexMsrParams(skeleton2dHolesPolicy, skeletonVertexCategory));
    
    // compute measure on shape 2d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis2d(pInGreyImg2d, pShape2dColl, pMeasureInfoSet);
    // retrieve associated results
    const MeasureConstPtr& pSkeleton2dNbVertexOutMsr = pOutMeasureSet->getMeasure("Skeleton2dNbVertexMsr");
    const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipUInt32>& outResults = static_cast<const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipUInt32>&>(pSkeleton2dNbVertexOutMsr->getMeasureResult());