1. Traffic Density Estimation
R Jia-Yau Shiau

2. Agenda Problem Definition Challenges & Possible Approaches
Results of State-of-the-art Detector
Results of Density Estimator
Future Works

3. Traffic Density Estimation

4. Vehicle Detector VD

5. How About Camera VD VD VD

6. Close Circuit Traffic Camera (CCTV)

7. Challenges Low frame rate Low resolution High occlusion
Large perspective

8. Possible Approaches
Detector & Tracker
Whole frame estimation

9. fasterRCNN
Deforamable FPN OHEM loss

10. Deformable CNN Model geometric transformation FPN + OHEM
Deformable convolution
Deformable RoI pooling
FPN + OHEM

11. Retina-Net Single Stage detector Fusion model with FPN and Res-Net
New loss function: focal loss

12. Scene 1
Retina-Net
Deformable CNN

13. Scene 2
Retina-Net
Deformable CNN

14. Density Map & Optical Flow

15. Convolution & Transpose

16. Scene 1