Research Article
Edge Detection-Based Feature Extraction for the Systems of Activity Recognition
Figure 2
Another preparation of edge direction. (a) (Mi, Mj), (b) (−Mi, Mj), (c) (Mj, Mi), and (d) (−Mj, −Mi), respectively.
| (a) |
| (b) |
| (c) |
| (d) |
| (a) |
| (b) |
| (c) |
| (d) |