Last change
on this file since 177 was
37,
checked in by (none), 15 years ago
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Added original make3d
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-
Property svn:executable set to
*
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File size:
943 bytes
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1 | function H=vgg_projective_basis_2d(p1,p2,p3,p4);
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2 | %
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3 | % function H=vgg_projective_basis_2d(p1,p2,p3,p4);
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4 | %
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5 | % Computes 3x3 homography matrix H such that
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6 | %
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7 | % H * [p1 p2 p3 p4] ~ [ 1 0 0 1
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8 | % 0 1 0 1
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9 | % 0 0 1 1 ]
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10 | %
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11 | % fsm@robots
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12 | %
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13 |
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14 | if ( (~ exist('p1')) | (~ exist('p2')) | (~ exist('p3')) | (~ exist('p4')) )
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15 | error('missing input argument(s)');
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16 | end
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17 |
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18 | if ( prod(size(p1)) == 3 )
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19 | p1=reshape(p1,[3 1]);
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20 | else
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21 | error('p1 must have 3 entries');
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22 | end
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23 |
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24 | if ( prod(size(p2)) == 3 )
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25 | p2=reshape(p2,[3 1]);
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26 | else
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27 | error('p2 must have 3 entries');
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28 | end
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29 |
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30 | if ( prod(size(p3)) == 3 )
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31 | p3=reshape(p3,[3 1]);
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32 | else
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33 | error('p3 must have 3 entries');
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34 | end
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35 |
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36 | if ( prod(size(p4)) == 3 )
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37 | p4=reshape(p4,[3 1]);
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38 | else
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39 | error('p4 must have 3 entries');
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40 | end
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41 |
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42 | %
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43 | tmp=[p1 p2 p3] \ p4;
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44 | p1 = p1*tmp(1);
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45 | p2 = p2*tmp(2);
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46 | p3 = p3*tmp(3);
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47 |
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48 | % now p4=p1+p2+p3
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49 |
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50 | H=inv([p1 p2 p3]);
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51 |
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52 | return;
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