Counting in High-Density Crowd Videos

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Presentation transcript:

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

Video Annotations Method Compute forward tracks. Compute backward tracks. Match forward and backward tracks. Distance Appearance (Intensity Histogram) Added the constraint that if distance is large keep both tracks and don’t match. Compute average tracks by using weighting system. t frame t+step frame

Video Annotations Manually Annotated Frame

Video Annotations Annotations computed by our method.

Video Annotations Manually Annotated Frame

Motion for Counting and Segmentation Saad Ali and Mubarak Shah, A Lagrangian Particle Dynamics Approach for Crowd Flow Segmentation and Stability Analysis, IEEE International Conference on Computer Vision and Pattern Recognition (CVPR), Minneapolis, June 19-21, 2007.

Crowd Flow Segmentation Segmentation using Saad Ali’s method. Input (Video) Output (1 Segmentation Mask)

Density Segmentation Segmentation using our method. Input (1 Frame) Output (1 Segmentation Mask)

Crowd Segmentation Challenges with this Video Low Resolution Saad Ali’s Method Our Method Challenges with this Video Low Resolution Very noisy Hard to compute segmentation using density map.

Counting in Videos Compute superpixels for each frame. Compute counts for each superpixel in all frames. Compute trajectories. Use trajectories to construct a Conditional Random Field (CRF) to smooth/improve counts between frames.