shapes (version 1.0-2)

bookstein2d: Bookstein's baseline registration for 2D data

Description

Carries out Bookstein's baseline registration and calculates a mean shape.

Usage

bookstein2d(A,l1=1,l2=2)

Arguments

A

a k x 2 x n real array, or k x n complex matrix, where k is the number of landmarks, n is the number of observations

l1

an integer : l1 is sent to (-1/2,0) in the registration

l2

an integer : l2 is sent to (1/2,0) in the registration

Value

• A list with components
• k
  no of landmarks
• n
  sample size
• mshape
  Bookstein mean shape with baseline l1, l2
• bshpv
  the k x n x 2 array of Bookstein shape variables, including the baseline

References

Dryden, I.L. and Mardia, K.V. (1998) Statistical Shape Analysis. Wiley, Chichester. Chapter 2.

Bookstein, F. L. (1986) Size and shape spaces for landmark data in two dimensions (with discussion). Statistical Science, 1:181-242.

Examples

data(gorf.dat)
data(gorm.dat)

bookf<-bookstein2d(gorf.dat)
bookm<-bookstein2d(gorm.dat)

plotshapes(bookf$mshape,bookm$mshape,joinline=c(1,6,7,8,2,3,4,5,1))