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type ClusterConfig struct {
	// BandWidth specifies the maximum fractional distance between
	// endpoints of images being clustered into sub-piles. See
	// turner.Cluster for details.
	BandWidth float64

	// RequiredCover specifies the target coverage fraction for
	// each input pile. If RequiredCover is greater than 1, all
	// all sub-piles are retained depending on the values of
	// KeepOverlaps and OverlapThresh.
	RequiredCover float64

	// OverlapStrictness specifies the clustering behaviour.
	// If OverlapStrictness is zero, all clusters are passed
	// returned. If set to one, clusters containing clusters
	// with greater depth are rejected. If set to two, contained
	// features overlapping by more than OverlapThresh fraction
	// of the smaller pile are are discarded.
	OverlapStrictness byte
	OverlapThresh     float64

	// Procs specifies the number of independent clustering
	// instances to run in parallel. If zero, only single threaded
	// operation is performed.
	Procs int
}

type GroupConfig struct {
	// PileDiff specifies the acceptable fractional difference between
	// piles for assignment to the same group.
	PileDiff float64
	// ImageDiff specifies the acceptable fractional difference between
	// an image and its containing pile when considering a pile for
	// assignment based on that image.
	ImageDiff float64

	// When Classic is true, Group will run a reasonable approximation
	// of the original C PILER family grouping.
	Classic bool
}