1 | % By Philip Torr 2002
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2 | % copyright Microsoft Corp.
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3 | % so we display an epipolar line from image 1 into image 2
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4 | %%%%%%%
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5 |
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6 |
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7 | function torr_display_epipolar(f,ax_handle2,ax_handle3,m3)
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8 |
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9 | % (x2 y2 m3) F (x1 y1 m3)'
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10 | % (image 2) F ( image 1)'
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11 |
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12 | %while 1
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13 |
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14 | %this takes one image and draws the corresponding epipolar line.
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15 | Fmat = [[f(1) f(2) f(3)]; [f(4) f(5) f(6)];[f(7) f(8) f(9)]];
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16 |
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17 |
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18 |
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19 | [U,S,V] = svd(Fmat);
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20 | S(3,3) = 0;
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21 | F2 = U*S*V';
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22 |
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23 | [v,d] = eig(F2);
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24 | ee = v(:,1);
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25 | %Fmat * ee
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26 |
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27 |
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28 |
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29 | axes(ax_handle2);
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30 | hold on
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31 | [Xcur,Ycur] = GINPUT;
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32 | n_plots = length(Xcur);
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33 |
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34 | plot(Xcur,Ycur, 'w+','LineWidth',2);
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35 | % plot(matches12(i,1), matches12(i,2), 'b+','LineWidth',2);
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36 | xxx1 = [Xcur,Ycur, ones(n_plots,1) * m3];
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37 |
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38 | % (x2 y2 m3) F (x1 y1 m3)'
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39 | % (image 2) F ( image 1)'
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40 |
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41 | el2 = F2 * xxx1';
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42 | %is this the wrogn way round>
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43 | el2 = el2';
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44 |
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45 |
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46 | axes(ax_handle3);
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47 |
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48 | %define two points x1 = 0, x2 =
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49 | % note x 1 + y 2 + m3 3 = 0
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50 | % y = (-m3 3 - x 1 ) / 2
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51 |
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52 |
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53 | x1 = ones(n_plots,1) * -20000;
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54 | % y1 = - (el2(:,3) * m3) ./el2(:,2);
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55 | y1 = (- (el2(:,3) * m3) - (x1(:) .* el2(:,1))) ./el2(:,2);
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56 |
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57 | x2 = ones(n_plots,1) * 20000;
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58 | y2 = (- (el2(:,3) * m3) - (x2(:) .* el2(:,1))) ./el2(:,2);
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59 |
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60 |
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61 |
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62 | hold on
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63 | a = [x1,x2]';
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64 | b = [ y1,y2 ]';
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65 | % plot(x1,y1, 'g+');
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66 | line(a,b,'Color','r');
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67 |
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68 | hold off
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69 |
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70 | %end |
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