1 | % * This code was used in the following articles:
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2 | % * [1] Learning 3-D Scene Structure from a Single Still Image,
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3 | % * Ashutosh Saxena, Min Sun, Andrew Y. Ng,
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4 | % * In ICCV workshop on 3D Representation for Recognition (3dRR-07), 2007.
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5 | % * (best paper)
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6 | % * [2] 3-D Reconstruction from Sparse Views using Monocular Vision,
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7 | % * Ashutosh Saxena, Min Sun, Andrew Y. Ng,
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8 | % * In ICCV workshop on Virtual Representations and Modeling
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9 | % * of Large-scale environments (VRML), 2007.
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10 | % * [3] 3-D Depth Reconstruction from a Single Still Image,
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11 | % * Ashutosh Saxena, Sung H. Chung, Andrew Y. Ng.
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12 | % * International Journal of Computer Vision (IJCV), Aug 2007.
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13 | % * [6] Learning Depth from Single Monocular Images,
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14 | % * Ashutosh Saxena, Sung H. Chung, Andrew Y. Ng.
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15 | % * In Neural Information Processing Systems (NIPS) 18, 2005.
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16 | % *
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17 | % * These articles are available at:
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18 | % * http://make3d.stanford.edu/publications
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19 | % *
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20 | % * We request that you cite the papers [1], [3] and [6] in any of
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21 | % * your reports that uses this code.
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22 | % * Further, if you use the code in image3dstiching/ (multiple image version),
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23 | % * then please cite [2].
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24 | % *
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25 | % * If you use the code in third_party/, then PLEASE CITE and follow the
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26 | % * LICENSE OF THE CORRESPONDING THIRD PARTY CODE.
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27 | % *
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28 | % * Finally, this code is for non-commercial use only. For further
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29 | % * information and to obtain a copy of the license, see
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30 | % *
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31 | % * http://make3d.stanford.edu/publications/code
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32 | % *
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33 | % * Also, the software distributed under the License is distributed on an
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34 | % * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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35 | % * express or implied. See the License for the specific language governing
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36 | % * permissions and limitations under the License.
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37 | % *
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38 | % */
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39 | function [Proj] = LineProj(seglist, x , y) |
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40 | |
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41 | % this function output the porject point on the given lineSeg |
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42 | |
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43 | if isempty(x) && isempty(y) |
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44 | Proj = sparse(0,1); |
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45 | return; |
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46 | end |
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47 | |
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48 | if isempty(x) |
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49 | Proj = (seglist(1)-seglist(3))/(seglist(2)-seglist(4))*(y -seglist(2))+seglist(1); |
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50 | if any(isinf(Proj)) |
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51 | disp('Proj_InfX'); |
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52 | end |
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53 | elseif isempty(y) |
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54 | Proj = (seglist(2)-seglist(4))/(seglist(1)-seglist(3))*(x -seglist(1))+seglist(2); |
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55 | if any(isinf(Proj)) |
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56 | disp('Proj_InfY'); |
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57 | end |
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58 | else |
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59 | if seglist(1)-seglist(3) == 0 |
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60 | Proj = x <= seglist(1); |
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61 | elseif seglist(2)-seglist(4) == 0 |
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62 | Proj = y <= seglist(2); |
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63 | else |
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64 | % Proj = (x - seglist(1))./(y - seglist(2)) - (seglist(1)-seglist(3))/(seglist(2)-seglist(4)); |
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65 | % temp = (seglist(2)-seglist(4))/(seglist(1)-seglist(3))*(x -seglist(1))+seglist(2); |
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66 | % Proj = (y - temp)>=0; |
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67 | LineTarget = (seglist(:,1)-seglist(:,3) ~=0); |
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68 | temp = repmat((seglist(LineTarget,2)-seglist(LineTarget,4))./(seglist(LineTarget,1)-seglist(LineTarget,3)),[1 size(x,1)]).*... |
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69 | (repmat(x',[size(seglist(LineTarget,1),1) 1]) -repmat(seglist(LineTarget,1),[1 size(x,1)]))+repmat(seglist(LineTarget,2),[1 size(x,1)]); |
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70 | Proj = ((repmat(y',[size(seglist(LineTarget,1),1) 1]) - temp)>=0)'; |
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71 | LineTarget = (seglist(:,1)-seglist(:,3) ==0); |
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72 | OProj = (( repmat(x',[size(seglist(LineTarget,1),1) 1]) - repmat(seglist(LineTarget,1),[1 size(x,1)]))>=0)'; |
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73 | if sum(LineTarget(:))~=0 |
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74 | Proj = [Proj OProj]; |
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75 | end |
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76 | end |
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77 | end |
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78 | return; |
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79 | |
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