Skip to main content
Figure 7 | Frontiers in Zoology

Figure 7

From: Stereoscopic motion analysis in densely packed clusters: 3D analysis of the shimmering behaviour in Giant honey bees

Figure 7

Detection of the wave front. (a) Frame ("f") 177 (of 900, taken by the left camera within 15 s at fps = 60 Hz) recorded 6 frames after the arrival of a wave at agent 58 (compare vertical yellow lines in e); (a1) original image; (a2) differential image calculated by pixel-operated subtraction; the white spots show changes in luminance from f 176 to f 177. Yellow rectangles show 500 × 500 pixel areas around agent 58 for the frame 177. (b1-3,c1-3) Details of ff 176-178 (images from left to right) as original and differential images; white rectangles (15 × 15 mm) denote the sensor regions of interest (sROIs) for measuring the motions of (and around) agent 58 (labelled with a white cross). (d1-40) Survey of the differential images, exemplified in (c1-3), but for 40 frames; the arrival of the wave (t0 = 0 s; violet vertical bars in e) was calculated for f 171 (violet rectangles in d) and identified as the time at one frame before agent 58 was affected by the incoming wave. (e1) Relative response strength (rRS), expressed relative to the maximum RS value found in 605 agents. (e2) Relative (offset-corrected, see text) changes of the positions of the thorax of agent 58 in the course of shimmering in mm: orange, horizontal directions (Δx: positive direction is to the right side); blue, vertical directions (Δy: positive direction is upwards); red, directions towards and from the comb (Δz: positive direction is away from the comb).

Back to article page