GreyBarycenter

Measure allowing to compute the barycenter ponderated by the gray level of each pixel for shape. More...

Classes
class	ipsdk::imaproc::shape::analysis::GreyBarycenterMsr
	Measurement object for measure GreyBarycenter. More...
class	ipsdk::imaproc::shape::analysis::GreyBarycenterMsrInfo
	Information object for measure GreyBarycenter. More...
class	ipsdk::imaproc::shape::analysis::GreyBarycenterMsrResults
	Measurement results object for measure GreyBarycenter. More...

Detailed Description

Measure allowing to compute the barycenter ponderated by the gray level of each pixel for shape.

The coordinates of the grey barycenter for a given 2d or 3d shape are computed as follows :

Where is the set of pixels in the shape and is the number of elements (i.e. pixels in 2d case or voxels in 3d case) of the shape.

Here is an example of 2d grey barycenter measurement :

Author

R. Abbal

Date

2015/07/30

Copyright

2015 Reactiv'IP, all right reserved.

Measure allowing to compute the barycenter ponderated by the gray level of each pixel for shape

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Intensity	None	None	Custom	Row Intersections

See Shape measurement for additional information on these pictograms

Measure Type :

This is an intensity measure

• it use image data to compute a result
• it optionally can use dependencies to other measures to compute a result (see Measure Dependencies section)

This measure can be used in 2d and 3d case

Measure Unit Type:

Measure GreyBarycenter is not associated to any unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_NoUnit]

Measure Parameter Type :

Measure GreyBarycenter has no parameters

Measure Result Type :

Measure GreyBarycenter is associated to GreyBarycenterMsrResults results

Measure Shape Requirements :

Measure GreyBarycenter requires row intersections from shape data

Measure Dependencies :

Measure GreyBarycenter depends on following measures :

Measure Mode	Measure Name	Measure Type	Measure Parameters
eMVP_2d3d	Sum	Sum

Note

See Shape Analysis 2d for more information on general shape 2d analysis and measurement usage.

See Shape Analysis 3d for more information on general shape 3d 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, "GreyBarycenterMsr")
    
    #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("GreyBarycenterMsr")
    
    # retrieve measure values
    outMsrValues = outMsr.getMeasureResult().getColl(0)
    print("First label measurement equal " + str(outMsrValues[1]))

Generic example in 3d case :

import PyIPSDK
import PyIPSDK.IPSDKIPLShapeAnalysis as shapeanalysis

    # Create the infoset
    inMeasureInfoSet3d = PyIPSDK.createMeasureInfoSet3d()
    PyIPSDK.createMeasureInfo(inMeasureInfoSet3d, "GreyBarycenterMsr")
    
    #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("GreyBarycenterMsr")
    
    # 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>();
    readFromXmlFile(inputShape2dCollPath, *pShape2dColl);

    // define a measure info set
    MeasureInfoSetPtr pMeasureInfoSet = MeasureInfoSet::create2dInstance();
    createMeasureInfo(pMeasureInfoSet, "GreyBarycenterMsr");
    
    // compute measure on shape 2d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis2d(pInGreyImg2d, pShape2dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pGreyBarycenterOutMsr = pOutMeasureSet->getMeasure("GreyBarycenterMsr");
    const GreyBarycenterMsrResults& outResults = static_cast<const GreyBarycenterMsrResults&>(pGreyBarycenterOutMsr->getMeasureResult());