| () Input: Light field LF, slope range , the |
| number of training samples , the number of testing |
| samples |
| () Output: The energy ratio of the feature points which |
| have the same slope value with in all feature points |
| which come from all rectified EPIs. |
| () / Plane fitting stage / |
| () Choose EPIs from LF randomly. |
| () Calculate the best parameters of each EPI by |
| using the algorithm mentioned in Section 3.2. |
| () Select the which has the most frequency in all as |
| the common . And fit the linear function of with |
| by using the whose equals to . |
| () / Feature extracting stage / |
| () Choose EPIs from LF randomly. |
| () Calculate the parameters of each EPI by using |
| the common and the linear function of with . |
| () Rectify each EPI with its by using the algorithm |
| mentioned in Section 3.1. |
| () Extract the Lisad-1 feature points of all rectified EPIs. |
| () Count the ratio of the feature points which have |
| same slope value with for each EPI, and contruct a |
| the feature vector by combining these ratios in a |
| descending order. |
| () Employ a classifier to distinguish flat surface from |
| natural scenes. |
