pnn

type Heap []*Node

type Histogram map[uint32]*Node

type Node struct {
	Prev  *Node   // Pointer to the previous Node
	Next  *Node   // Pointer to the Next Node
	D     float64 // Merge cost value, indicating the increase in the MSE if the two classes are merged (this class and the one to the right)
	N     float64 // Number of pixels in the class
	Index int     // Index of the Node in the heap

	// Variables for greyscale quantisation
	C float64 // Mean grey level of the class
	T uint8   // Maximal grey value, also serves as threshold between the class and its neighbour class to the right

	// Variables for colour quantisation
	colours.RGB         // RGB Values of the node
	A           float64 // Alpha Value of the node (Used for non-LAB PNN)
	NN          *Node   // Pointers to the nearest neighbour
	MergeCount  int     // The iteration where the node was last merged with another
	UpdateCount int     // The iteration where the MSE was last calculated for the node
}

type PNNMode uint8