Distance to nearest barycenter 2d

computation of distance from shape barycenter to nearest neighbor shape barycenter for each shape More...

Classes
class	ipsdk::imaproc::shape::analysis::DistanceToNearestBarycenter2dMsr
	Measurement object for measure DistanceToNearestBarycenter2d. More...
class	ipsdk::imaproc::shape::analysis::DistanceToNearestBarycenter2dMsrInfo
	Information object for measure DistanceToNearestBarycenter2d. More...

Detailed Description

computation of distance from shape barycenter to nearest neighbor shape barycenter for each shape

This measure allows to compute the distance from the shape barycenter to its nearest neighbor shape barycenter. It is based on a geometric analysis of shape neighborhood.

Here is an example of nearest barycenter computation for several shapes :

In the previous figure, the shapes (ie. the polygonal approximation of boundaries), are colored with respect to the computed distance to nearest barycenter.

Author

E.Noirfalise

Date

2018/07/23

Copyright

2018 Reactiv'IP, all right reserved.

computation of distance from shape barycenter to nearest neighbor shape barycenter for each shape

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Geometry 2d	Length	None	Value (ipsdk::ipReal64)	Row Intersections

See Shape measurement for additional information on these pictograms

Measure Type :

This is a geometry 2d measure

• it use shape 2d 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 2d case

Measure Unit Type:

Measure DistanceToNearestBarycenter2d is associated to a length measurement unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_LengthUnit]

Measure Parameter Type :

Measure DistanceToNearestBarycenter2d has no parameters

Measure Result Type :

Measure DistanceToNearestBarycenter2d is associated to ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64> results

Measure Shape Requirements :

Measure DistanceToNearestBarycenter2d requires row intersections from shape data

Measure Dependencies :

Measure DistanceToNearestBarycenter2d depends on following measures :

Measure Mode	Measure Name	Measure Type	Measure Parameters
eMVP_2d	Barycenter2dCollRTree	Barycenter2dCollRTree
eMVP_2d	Barycenter	Barycenter2d

Note

See Shape Analysis 2d for more information on general shape 2d 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, "DistanceToNearestBarycenter2dMsr")
    
    #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("DistanceToNearestBarycenter2dMsr")
    
    # 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, "DistanceToNearestBarycenter2dMsr");
    
    // compute measure on shape 2d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis2d(pInGreyImg2d, pShape2dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pDistanceToNearestBarycenter2dOutMsr = pOutMeasureSet->getMeasure("DistanceToNearestBarycenter2dMsr");
    const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64>& outResults = static_cast<const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64>&>(pDistanceToNearestBarycenter2dOutMsr->getMeasureResult());