Crowd Event Perception Based on Spatiotemporal Weber Field

Figure 5

Schematic for the calculation of spatiotemporal Weber variation feature. 𝑃(𝑥,𝑦,𝑡) is the center of the cylindroid spatiotemporal volume; 𝐴∶𝑃_𝐴(𝑟,𝜃,𝑡) and 𝐵∶𝑃_𝐵(𝑟+Δ𝑟,𝜃+Δ𝜃,𝑡+Δ𝑡) are two arbitrary pixels in the volume.