procrustes algorithm gives no T transform matrix back

2019 1 7
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更新时间：2019 1 7
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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));

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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);

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