FeretDiameter3d

Compute, for a given orientation, Feret diameter (measure based on polyhedral approximation) More...

Classes
class	ipsdk::imaproc::shape::analysis::FeretDiameter3dMsr
	Measurement object for measure FeretDiameter3d. More...
class	ipsdk::imaproc::shape::analysis::FeretDiameter3dMsrInfo
	Information object for measure FeretDiameter3d. More...
class	ipsdk::imaproc::shape::analysis::FeretDiameter3dMsrParams
	Parameter object for measure FeretDiameter3d. More...

Functions
IPSDKIPLSHAPEANALYSIS_API FeretDiameter3dMsrParamsPtr	ipsdk::imaproc::shape::analysis::createFeretDiameter3dMsrParams (ipReal64 phi, ipReal64 theta)
	function allowing to create a new parameter object for FeretDiameter3d measure

Detailed Description

Compute, for a given orientation, Feret diameter (measure based on polyhedral approximation)

The 3d Feret diameter (also called "caliper diameter", referring to the measurement of an object size with a caliper) is a measure of the size of a 3d shape in a given direction (that will be described by 2 angles and ). The 2 angles and of the Feret diameter can be specified by the user. must belong to the range [0; [, and must belong to the range [0; ]

For more information about the definition of the 2 angles, report to "ConventionsPoints3d" section in the Core documentation

Here is an example of 3d Feret diameter measurement for :

See also

https://en.wikipedia.org/wiki/Feret_diameter

Author

H. Delestre

Date

2016/03/24

Copyright

2016 Reactiv'IP, all right reserved.

computes, for a given orientation, Feret diameter

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Generic	Length	FeretDiameter3dMsrParams	Value (ipsdk::ipReal64)	Boundary Approximation

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 FeretDiameter3d is associated to a length measurement unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_LengthUnit]

Measure Parameter Type :

Measure FeretDiameter3d is associated to FeretDiameter3dMsrParams parameters

Measure Result Type :

Measure FeretDiameter3d is associated to ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64> results

Measure Shape Requirements :

Measure FeretDiameter3d requires boundary approximation from shape data

Measure Dependencies :

Measure FeretDiameter3d depends on following measures :

Measure Mode	Measure Name	Measure Type	Measure Parameters
eMVP_3d	ConvexHull3d	ConvexHull3d

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, "FeretDiameter3dMsr")
    
    #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("FeretDiameter3dMsr")
    
    # 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>();
    readFromBinaryFile(inputShape3dCollPath, *pShape3dColl);

    // define a measure info set
    MeasureInfoSetPtr pMeasureInfoSet = MeasureInfoSet::create3dInstance();
    createMeasureInfo(pMeasureInfoSet, "FeretDiameter3dMsr", createFeretDiameter3dMsrParams(phi, theta));
    
    // compute measure on shape 3d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis3d(pInGreyImg3d, pShape3dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pFeretDiameter3dOutMsr = pOutMeasureSet->getMeasure("FeretDiameter3dMsr");
    const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64>& outResults = static_cast<const ipsdk::shape::analysis::ValueMeasureResult<ipsdk::ipReal64>&>(pFeretDiameter3dOutMsr->getMeasureResult());