ddf


Purpose
This function calculates the directional distribution of points defined in [1] of a point process returning the distributions in matrix T.

Synopsis
T = ddf(H, r1, r2)
T = ddf(H, r1, r2, N)
T = ddf(H, r1, r2, N, str)
[T, a] = ddf(H, ...)

Description
T=ddf(H, r1, r2) calculates the directional distribution T of points in B, type uint8, such that r1<=|x-y|<r2.

T=ddf(H, r1, r2, N) specifies the number of angular bins as N, (default=72).

T=ddf(H, r1, r2, N, str), when str="cluster", ddf calculates the direction distribution of daughter points about a parent point.

[T, a]=ddf(H, ...) returns the center angle for each bin of T in a.

See Also
nnt

Reference
[1] J. Ohser, D. Stoyan, On the second-order and orientation analysis of planar stationary point processes, Biometrics Journal, Vol. 23, 1981.

Author
Daniel Leo Lau, Copyright August 18, 1997.




Dr. Daniel Leo Lau
Department of Electrical and Computer Engineering
University of Kentucky
453 Anderson Hall
Lexington, KY 40506-0046, USA
(859) 257-2300 x273
dllau@engr.uky.edu

last edited on 4/20/04