Figure 2.

Schematic of the stereo-matching and tracking procedures to solve the optical occlusion. (a) The camera set-up for imaging two birds, where the images of two birds overlap on camera 1 and separate on camera 2. (b) Time series of bird images on the two cameras, with the detected bird 2D locations marked as crosses. (c) Stereo-matching for all detected birds on camera 1, with the matched birds shown in the circles. (d) Reconstructed 3D positions for the matched birds in (c). (e) Stereo-matching for all unmatched birds on camera 2, with the matched birds shown in the circles. (f) Reconstructed 3D positions for the matched birds in (e). (g) The 3D trajectories of the two birds. (Online version in colour.)