OrientedBoundingBox2d

2d Oriented bounding box fitting a shape More...

Classes
class	ipsdk::imaproc::shape::analysis::OrientedBoundingBox2dMsr
	Measurement object for measure OrientedBoundingBox2d. More...
class	ipsdk::imaproc::shape::analysis::OrientedBoundingBox2dMsrInfo
	Information object for measure OrientedBoundingBox2d. More...
class	ipsdk::imaproc::shape::analysis::OrientedBoundingBox2dMsrParams
	Parameter object for measure OrientedBoundingBox2d. More...
class	ipsdk::imaproc::shape::analysis::OrientedBoundingBox2dMsrResults
	Measurement results object for measure OrientedBoundingBox2d. More...

Functions
IPSDKIPLSHAPEANALYSIS_API OrientedBoundingBox2dMsrParamsPtr	ipsdk::imaproc::shape::analysis::createOrientedBoundingBox2dMsrParams (ipUInt32 nbOrientations)
	function allowing to create a new parameter object for OrientedBoundingBox2d measure

Detailed Description

2d Oriented bounding box fitting a shape

This measure uses FeretDiameter2d to compute the oriented minimum bounding box for each shape.

The Feret diameters are calculated for a given angle and . The corners coordinates of the bounding box are then computed and the resulting oriented bounding box is selected so that its area is minimal.

Here is an example of oriented bounding box measurement, the oriented bounding boxes are displayed with dashed lines :

See also

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

Author

R. Abbal

Date

2015/07/24

Copyright

2015 Reactiv'IP, all right reserved.

2d Oriented bounding box fitting a shape

Measure synthesis :

Measure Type	Measure Unit Type	Parameter Type	Result Type	Shape Requirements
Generic	None	OrientedBoundingBox2dMsrParams	Custom	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 2d case

Measure Unit Type:

Measure OrientedBoundingBox2d is not associated to any unit [ipsdk::shape::analysis::eMsrUnitFormat::eMUF_NoUnit]

Measure Parameter Type :

Measure OrientedBoundingBox2d is associated to OrientedBoundingBox2dMsrParams parameters

Measure Result Type :

Measure OrientedBoundingBox2d is associated to OrientedBoundingBox2dMsrResults results

Measure Shape Requirements :

Measure OrientedBoundingBox2d requires boundary approximation from shape data

Measure Dependencies :

Measure OrientedBoundingBox2d depends on following measures :

Measure Mode	Measure Name	Measure Type	Measure Parameters
eMVP_2d	FeretOrthogonalDiameters_00000	FeretOrthogonalDiameters2d	createFeretOrthogonalDiameters2dMsrParams(0.)

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, "OrientedBoundingBox2dMsr")
    
    #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("OrientedBoundingBox2dMsr")
    
    # 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, "OrientedBoundingBox2dMsr", createOrientedBoundingBox2dMsrParams(36));
    
    // compute measure on shape 2d collection
    MeasureSetPtr pOutMeasureSet = shapeAnalysis2d(pInGreyImg2d, pShape2dColl, pMeasureInfoSet);

    // retrieve associated results
    const MeasureConstPtr& pOrientedBoundingBox2dOutMsr = pOutMeasureSet->getMeasure("OrientedBoundingBox2dMsr");
    const OrientedBoundingBox2dMsrResults& outResults = static_cast<const OrientedBoundingBox2dMsrResults&>(pOrientedBoundingBox2dOutMsr->getMeasureResult());