Definiens Developer 7 - PCI Geomatics

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Definiens Developer 7 - Reference Book3 Algorithms ReferenceApply to Child Processes OnlyValueYesNoDescriptionSetting changes apply to child processes of this algorithm only.Settings apply globally, persisting after completion of execution..Distance CalculationValue DescriptionSmallest Uses the smallest enclosing rectangle of an image object for distanceenclosing calculations.rectangleCenter of Uses the center of gravity of an image object for distance calculations.gravityDefault Reset to the default when the rule set is saved.Keep Current Keep the current setting when the rule set is saved,Current Resampling MethodValueDescriptionCenter of Pixel Resampling occurs from the center of the pixel.Upper left Resampling occurs from the upper left corner of the pixel.corner of pixelDefault Reset to the default when the rule set is saved.Keep CurrentKeep the current setting when the rule set is saved.Evaluate Conditions on Undefined Features as 0ValueDescriptionYesIgnore undefined features.No Evaluate undefined features as 0.Default Reset to the default when the rule set is saved.Keep Current Keep the current setting when the rule set is saved.Polygons Base Polygon ThresholdSet the degree of abstraction for the base polygons.Default: 1.25Polygons Shape Polygon ThresholdSet the degree of abstraction for the shape polygons. Shape polygons are independentof the topological structure and consist of at least three points. The threshold for shapepolygons can be changed any time without the need to recalculate the basevectorization.Default: 114
IDefiniens Developer 7 - Reference Book3 Algorithms ReferencePolygons Remove SliversEnable Remove slivers to avoid intersection of edges of adjacent polygons and selfintersectionsof polygons.Sliver removal becomes necessary with higher threshold values for base polygongeneration. Note that the processing time to remove slivers is high, especially for lowthresholds where it is not needed anyway.ValueNoYesDefaultKeep CurrentDescriptionAllow intersection of polygon edges and self-intersections.Avoid intersection of edges of adjacent polygons and self-intersections ofpolygons.Reset to the default when the rule set is saved.Keep the current setting when the rule set is saved.3.2 Segmentation AlgorithmsSegmentation algorithms are used to subdivide the entire image represented by thepixel level domain or specific image objects from other domains into smaller imageobjects.Definiens provides several different approaches to this well known problem rangingfrom very simple algorithms like chessboard and quadtree based segmentation tohighly sophisticated methods like multiresolution segmentation or the contrast filtersegmentation.Segmentation algorithms are required whenever you want to create new image objectslevels based on the image layer information. But they are also a very valuable tool torefine existing image objects by subdividing them into smaller pieces for a moredetailed analysis.3.2.1 Chessboard SegmentationSplit the pixel domain or an image object domain into square image objects.A square grid aligned to the image left and top borders of fixed size is applied to allobjects in the domain and each object is cut along these grid lines.chessboardsegmentation15
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Definiens Developer 7 - PCI Geomatics

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