Definiens Developer 7 - PCI Geomatics

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Definiens Developer 7 - Reference Book3 Algorithms Reference3.4.1 Find Domain ExtremaClassify image objects fulfilling a local extrema condition within the image objectdomain according to an image object feature. This means that either the image objectwith smallest or the largest feature value within the domain will be classified accordingto the classification settings.find domain extremaExampleFigure 9: Result of find domain extrema using Extrema Type Maximum and Feature Area.Extrema TypeChoose Minimum for classifying image objects with the smallest feature values andMaximum for classifying image objects with largest feature values.FeatureChoose the feature to use for finding the extreme values.Accept Equal ExtremaEnable the algorithm to Accept equal extrema. This parameter defines the behavior ofthe algorithm if more than one image object is fulfilling the extreme condition. Ifenabled all image objects will be classified. If not none of the image objects will beclassified.Compatibility ModeSelect Yes from the Value field to enable compatibility with older software versions(version 3.5 and 4.0). This parameter will be removed with future versions.Classification SettingsSpecifies the classification that will be applied to all image objects fulfilling the extremecondition.See classification algorithm for details. Classification on page 2830
Definiens Developer 7 - Reference Book3 Algorithms ReferenceNoteAt least one class needs to be selected in the active class list for this algorithm3.4.2 Find Local ExtremaClassify image objects fulfilling a local extrema condition according to an image objectfeature within a search domain in their neighborhood. Image objects with either thesmallest or the largest feature value within a specific neighborhood will be classifiedaccording to the classification settings.find local extremaExampleParameterImage Object DomainFeatureExtrema TypeSearch RangeClass Filter for SearchConnectedValueall objects on level classified as centerAreaMaximum80 pixelscenter, N1, N2, biggestA) true B) falseSearch SettingsWith the Search Settings you can specify a search domain for the neighborhood aroundthe image object.Class FilterChoose the classes to be searched. Image objects will be part of the search domain ifthey are classified with one of the classes selected in the class filter.NoteAlways add the class selected for the classification to the search class filter. Otherwisecascades of incorrect extrema due to the reclassification during the execution of thealgorithm may appear.31
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