FirstPixel2d

Measure allowing to get the first pixel for 2d shape. More...

Classes
class	ipsdk::imaproc::shape::analysis::FirstPixel2dMsr
	Measurement object for measure FirstPixel2d. More...
class	ipsdk::imaproc::shape::analysis::FirstPixel2dMsrInfo
	Information object for measure FirstPixel2d. More...
class	ipsdk::imaproc::shape::analysis::FirstPixel2dMsrResults
	Measurement results object for measure FirstPixel2d. More...

Detailed Description

Measure allowing to get the first pixel for 2d shape.

This measure gets the coordinates (x,y) of the first pixel found for each shape.

Here is an example of first pixel measurement in 2d case :

Author

A. Eymar

Date

2022/01/31

Copyright

2022 Reactiv'IP, all right reserved.

Get first pixel coordinate for each shape

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Geometry 2d	None	None	Custom	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 FirstPixel2d is not associated to any unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_NoUnit]

Measure Parameter Type :

Measure FirstPixel2d has no parameters

Measure Result Type :

Measure FirstPixel2d is associated to FirstPixel2dMsrResults results

Measure Shape Requirements :

Measure FirstPixel2d requires row intersections from shape data

Measure Dependencies :

Measure FirstPixel2d 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, "FirstPixel2dMsr")
    
    #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("FirstPixel2dMsr")
    
    # 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, "FirstPixel2dMsr");
    
    // compute measure on shape 2d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis2d(pInGreyImg2d, pShape2dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pFirstPixel2dOutMsr = pOutMeasureSet->getMeasure("FirstPixel2dMsr");
    const FirstPixel2dMsrResults& outResults = static_cast<const FirstPixel2dMsrResults&>(pFirstPixel2dOutMsr->getMeasureResult());