The ancestor McProfileEdges from which luminance profiles are taken for edge placement.

A McLineProfiles object.  

object.ProfilesAncestor

The ProfilesAncestor Property syntax has these parts:

The ancestor McProfileEdges of this operator is an McLineProfiles object that is itself a child of some McLines or McRegions. Data from these ancestor objects are relevant to the collection of “edges” detected and maintained by this operator. In particular, the ProfileAncestor.CountOfProfiles property's current value is always the ancestor McFeatures.Count (McLines and McRegions are both derived from McFeatures). One set of edges is maintained for each of the ProfileAncestor.CountOfProfiles profiles.

Furthermore, edges are detected by the FindEdges method based on the sampled luminance profiles of the ProfilesAncestor, so the Interpretation and sampling parameters of that object will determine what the detection properties of this object will work on.