procrustes algorithm gives no T transform matrix back

Hi,

Im having some trouble with the procrustes algorithm. When I enter the code(which is shown below) my transform.T is just a single number.

What am i trying to do:

I have 4 markers in placed in an image and i rotate that image with imrotate3 a several times. When im finnised rotating i select my 4 markers, in the correct order and give them the the procrustes algorithm. The outcome of the algorithm is terrible, what am i doing wrong?

Code:

%Markers

pos1 = [20 20 20];

pos2 = [1 1 1];

pos3 = [size(X,1)/2 1 1];

pos4 = [size(X,1) 1 1];

%pivot coordinats

bpn = [pos1,pos2,pos3,pos4];

%positionEA

epn = [([82 492 24]),([66 510 2]),([35 528 254]),([6 546 507])];

%procrustes

[dissim,Z,trans] = procrustes(bpn',epn');

%outcome

en = bpn-(trans.T)'*epn-(trans.c)';

RMS = rms(norm(en));

Answer 1

[Erik-Jan Meulenbrugge]

this works

ePn = [1,20,size(X,1)/2,size(X,2);1,20,1,1;1,20,1,1];

bPn = [82,66,35,6;492,510,528,546;24,2,254,507];

[dissim,Z,trans] = procrustes(ePn',bPn','Scaling',true);