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AdjustPointGrids3D

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Module: Vision3DStandard

Aligns (rotation + translation) a point grid to match best the reference point grid.

Name Type Range Description
Input value
 inPoints Point3DGrid Data points to be aligned, may contain background clutter.
Input value
 inReferencePoints Point3DGrid Reference points to align to, may only contain points belonging to the object of interest.
Input value
 inMaxIterationCount Integer 1 - Maximal number of iteration for the algorithm
Input value
 inMatchFraction Real 0.0 - 1.0 Defines fraction of input points that is being fitted in every iteration
Input value
 inDiscardFurthestFraction Real 0.0 - 1.0 Fraction of point pairs to be discarded during internal ICP loop. Furthest pairs are discarded, and only in last 10% of algorithm iterations. Useful for handling outliers in the inReferencePoints, as well as gaps/holes in the inPoints data.
Output value
 outAlignedPoints Point3DGrid The aligned input points
Output value
 outAlignment Matrix The transform that aligns best the input points to the reference points
Diagnostic input
 diagPointsWorkingSet Point3DArray inPoints after decimation by inMatchFraction, i.e. points which will be fitted in every iteration
Diagnostic input
 diagReferencePointsWorkingSet Point3DArray inReferencePoints after decimation by inMatchFraction, i.e. points which will be fitted in every iteration
Diagnostic input
 diagAttractionSegments Segment3DArrayArray Attraction segments from every iteration. Note that the algorithm internally moves inReferencePoints towards inPoints (and returns inverse transformation), so the segments show movement of reference towards data.

Hints

  • Usually the inPoints Point3DGrid data contains an object with background - a flat plate or some other clutter. The filter handles such cases, however its best to remove this clutter beforehand. Note: The inReferencePoints input must contain only points belonging to the object.
  • The filter can not be used as a pattern localization tool, as it performs well only when adjustments to be made are relatively small. For problems where large adjustments are needed (especially rotations) the filter may fail.

Errors

This filter can throw an exception to report error. Read how to deal with errors in Error Handling.

List of possible exceptions:

Error type Description
DomainError Input point array is empty in AdjustPointGrids3D.

Complexity Level

This filter is available on Advanced Complexity Level.