Area2d

Shape 2d area measurement (measure NOT based on polygonal approximation) More...

Classes
class	ipsdk::imaproc::shape::analysis::Area2dMsr
	Measurement object for measure Area2d. More...
class	ipsdk::imaproc::shape::analysis::Area2dMsrInfo
	Information object for measure Area2d. More...

Typedefs
typedef HolesBasicPolicyMsrParams	ipsdk::imaproc::shape::analysis::Area2dMsrParams
	parameter type associated to class

Detailed Description

Shape 2d area measurement (measure NOT based on polygonal approximation)

Area2d simply count number of pixels associated to a 2d shape, ponderated with the calibration.

Here is an example of area 2d measurement :

Author

E. Noirfalise

Date

2015/06/30

Copyright

2015 Reactiv'IP, all right reserved.

Shape 2d area measurement (measure NOT based on polygonal approximation)

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Geometry 2d	Area	Area2dMsrParams	Value (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 Area2d is associated to an area measurement unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_AreaUnit]

Measure Parameter Type :

Measure Area2d is associated to Area2dMsrParams parameters

Measure Result Type :

Measure Area2d is associated to ipsdk::shape::analysis::ValueMeasureResult<ipReal64> results

Measure Shape Requirements :

Measure Area2d requires row intersections from shape data

Measure Dependencies :

Measure Area2d has no dependency

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, "Area2dMsr")
    
    #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
    outArea2dMsr = outMeasureSet.getMeasure("Area2dMsr")
    
    # retrieve measure values
    outArea2dValues = outArea2dMsr.getMeasureResult().getColl(0)
    print("First label area with holes measurement equal " + str(outArea2dValues[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, "Area2dMsr");

    // compute measure on shape 2d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis2d(pInGreyImg2d, pShape2dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pArea2dOutMsr = pOutMeasureSet->getMeasure("Area2dMsr");
    const ValueMeasureResult<ipReal64>& outResults = static_cast<const ValueMeasureResult<ipReal64>&>(pArea2dOutMsr->getMeasureResult());