Cell Operation

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Jing Hua
Jing Hua on 26 Jun 2012
Hi,
Does anyone know how to extract all arrays in a cell without mixing them all up in a single array (cell2mat) and at the same time using the loop.
clear all, clc
%Find the Boundaries of the Ellipse
I = imread('ellipse.png');
BW = im2bw(I, graythresh(I));
figure, imshow(BW);hold on
colors=['b' 'g' 'r' 'c' 'm' 'y'];
[B,L,N,A] = bwboundaries(BW);
%Get coordinates for each boundary
K=B{3};
x3=K(1:length(K),2);
y3=K(1:length(K),1);
E=B{4};
x4=E(1:length(E),2);
y4=E(1:length(E),1);
F=B{5};
x5=F(1:length(F),2);
y5=F(1:length(F),1);
G=B{6};
x6=G(1:length(G),2);
y6=G(1:length(G),1);
H=B{7};
x7=H(1:length(H),2);
y7=H(1:length(H),1);
J=B{8};
x8=J(1:length(J),2);
y8=J(1:length(J),1);
--------------------------------------- when I put those in a loop, is appears : bad cell operation
Thanks

Answers (1)

Walter Roberson
Walter Roberson on 26 Jun 2012
colors={'b' 'g' 'r' 'c' 'm' 'y'};
Notice the change from [] to {}
Please copy the exact error message, and show which line MATLAB thinks the problem is on.
I notice that you are assuming that bwboundaries() is going to return a cell with at least 8 entries. It is not a good to assume that. If you need 8 results back, check the size of the cell array before you start indexing into it.
  2 Comments
Walter Roberson
Walter Roberson on 26 Jun 2012
Please copy the exact error message, and show which line MATLAB thinks the problem is on.
bwboundaries() is not certain to have B contain 8 entries.
Please show class(B) and size(B)

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