GreyBarycenterZ

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

Classes
class	ipsdk::imaproc::shape::analysis::GreyBarycenterZMsr
	Measurement object for measure GreyBarycenterZ. More...
class	ipsdk::imaproc::shape::analysis::GreyBarycenterZMsrInfo
	Information object for measure GreyBarycenterZ. More...

Detailed Description

Measure allowing to compute the z-coordinate of 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 3d grey z-barycenter measurement; in that example, the intensity used to compute the measures are 1 if the pixel is inside a shape and 0 otherwise. Consequently, we get the same results than BarycenterZ :

Author

H. Delestre

Date

2016/10/05

Copyright

2016 Reactiv'IP, all right reserved.

Measure allowing to compute the z-coordinate of 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
Generic	Length	None	Value (ipsdk::ipReal64)	Row Intersections

See Shape measurement for additional information on these pictograms

Measure Type :

This is a generic measure

• it does not directly use shape or image data
• it 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 GreyBarycenterZ is associated to a length measurement unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_LengthUnit]

Measure Parameter Type :

Measure GreyBarycenterZ has no parameters

Measure Result Type :

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

Measure Shape Requirements :

Measure GreyBarycenterZ requires row intersections from shape data

Measure Dependencies :

Measure GreyBarycenterZ depends on following measures :

Measure Mode	Measure Name	Measure Type	Measure Parameters
eMVP_3d	GreyBarycenter	GreyBarycenter

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, "GreyBarycenterZMsr")
    
    #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("GreyBarycenterZMsr")
    
    # 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 pInGreyImg3d = loadTiffImageFile(inputGreyImgPath, eTiffDirectoryMode::eTDM_Volume);

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

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