1. Counting in High-Density Crowd Videos
Edgar Lopez
Mentor: Dr. Haroon Idrees

2. Video Annotations Method Compute forward tracks.
Compute backward tracks.
Match forward and backward tracks.
Compute average tracks by using weighting system.
t frame
t+step frame

3. Video Annotations 𝑇 𝑖 = 𝑠𝑡𝑒𝑝−𝑖+𝑡 𝑠𝑡𝑒𝑝 𝐹𝑇+ 𝑖−𝑡 𝑠𝑡𝑒𝑝 𝐵𝑇 step = 6 t = 1
𝑇 𝑖 = 𝑠𝑡𝑒𝑝−𝑖+𝑡 𝑠𝑡𝑒𝑝 𝐹𝑇+ 𝑖−𝑡 𝑠𝑡𝑒𝑝 𝐵𝑇
step = 6
t = 1
i = 2
i = 3
i = 4
i = 5
i = 6
𝑇 3 = 4 6 𝐹𝑇 𝐵𝑇
𝑇 4 = 3 6 𝐹𝑇 𝐵𝑇
𝑇 5 = 2 6 𝐹𝑇 𝐵𝑇
𝑇 3 = 1 6 𝐹𝑇 𝐵𝑇
𝑇 2 = 6−2+1 6 𝐹𝑇+ 2−1 6 𝐵𝑇
𝑇 2 = 5 6 𝐹𝑇 𝐵𝑇

4. Video Annotation Results

5. Video Annotation Results

6. Video Annotation Results
Every 5th frame annotated

7. Video Annotation Results
Every 30th frame annotated

8. Crowd Segmentation in Images
Superpixels
Region Size
Regularizer value
Density Map
Patch size
Graph Cuts Multi-label Energy Minimization
Lambda (how much weight we add to the constraint that neighboring superpixels must have a similar density)

9. Crowd Segmentation in Images1
Graph Cuts Multi-label Energy Minimization
u = 𝑢 1 𝑢 2 𝑢 𝑢 𝑛
𝒊=𝟏 𝒏 ( 𝒙 𝒊 − 𝒖 𝒊 ) 𝟐 +λ 𝒋=𝟏 𝒎 ( 𝒙 𝒊 − 𝒙 𝒋 ) 𝟐
GCMex function gives a label to each superpixel
𝟏− 𝒖 𝒊
𝒖 𝒊
𝑢 1
𝑢 2
𝑢 3
λ(𝒖 𝒊 − 𝒖 𝒋 ) 𝟐
𝑢 4
𝑢 5
𝑢 6
𝑢 7
𝑢 8
𝑢 𝑛

10. Crowd Segmentation in Images
Zabih, Ramin D., Olga Veksler, and Yuri Boykov. "System and method for fast approximate energy minimization via graph cuts." U.S. Patent No. 6,744, Jun

11. Experiment #1
Region Size = 50, Regularizer = 3000, Patch size = 192, Lambda = 0.25

12. Experiment #1
Region Size = 50, Regularizer = 3000, Patch size = 192, Lambda = 0.25

13. Experiment #1
Region Size = 50, Regularizer = 3000, Patch size = 192, Lambda = 0.25

14. Experiment #1
Region Size = 50, Regularizer = 3000, Patch size = 192, Lambda = 0.25

15. Experiment #1
Region Size = 50, Regularizer = 3000, Patch size = 192, Lambda = 0.25

16. Experiment #1
Region Size = 50, Regularizer = 3000, Patch size = 192, Lambda = 0.25

17. Experiment #2
Same parameters except patch size.
PS = 96
PS = 192

18. Experiment #2
Same parameters except patch size.
PS = 96
PS = 192

19. Experiment #2
Same parameters except patch size.
PS = 96
PS = 192

20. Crowd Segmentation in Images
Different image resolutions affect the parameters.
Add appearance features to improve segmentation.
Mean Intensity of superpixel
HOG Features