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 [ PickRow PickCol] = PickAnchorPoint(I) |
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40 | |
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41 | % [ PickRow PickCol] = PickAnchorPoint(I) |
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42 | |
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43 | % calculate Gradient Magnitude |
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44 | hy = fspecial('sobel'); |
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45 | hx = hy'; |
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46 | Iy = imfilter(double(I), hy, 'replicate'); |
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47 | Ix = imfilter(double(I), hx, 'replicate'); |
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48 | gradmag = sqrt(Ix.^2 + Iy.^2); |
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49 | |
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50 | % opening-by-reconstruction |
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51 | se = strel('disk', 20); |
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52 | Ie = imerode(I, se); |
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53 | Iobr = imreconstruct(Ie, I); |
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54 | |
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55 | % Opening-closing by reconstruction |
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56 | Iobrd = imdilate(Iobr, se); |
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57 | Iobrcbr = imreconstruct(imcomplement(Iobrd), imcomplement(Iobr)); |
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58 | Iobrcbr = imcomplement(Iobrcbr); |
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59 | |
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60 | % Background Markers |
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61 | bw = im2bw(Iobrcbr, graythresh(Iobrcbr)); |
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62 | |
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63 | EdgeLabel = edge(double(bw),'sobel'); |
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64 | |
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65 | if ~isempty(EdgeLabel) |
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66 | Filted_gradmag = zeros(size(gradmag)); |
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67 | Filted_gradmag(EdgeLabel) = gradmag(EdgeLabel); |
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68 | [VRow IRow] = max( Filted_gradmag); |
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69 | [Vcol Icol] = max(VRow); |
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70 | else |
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71 | [VRow IRow] = max( gradmag); |
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72 | [Vcol Icol] = max(VRow); |
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73 | end |
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74 | |
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75 | PickRow = IRow(Icol); |
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76 | PickCol = Icol; |
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77 | |
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78 | return; |
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79 | |
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