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Fig. 3 | BMC Biology

Fig. 3

From: Extracting physiological information in experimental biology via Eulerian video magnification

Fig. 3

Applicability of videos with varying spatiotemporal resolution for Eulerian video magnification. a Single frame from color-magnified video with a spatiotemporal resolution of 3840 × 2160 px2, 30 fps of anesthetized axolotl (Additional file 4, first part). b Vertical scan line from magnified video over time. c Heart and background signal (yellow and gray rings in a) development over time. d Fourier-transformed green channel signal in c in the frequency domain. eh Single frame (e), vertical scan line (f), gill and background signal development over time (g), and green channel signal in the frequency domain (h) in video with a spatiotemporal resolution of 2560 × 1440 px2, 30 fps (Additional file 4, second part). il Single frame (i), vertical scan line (j), gill and background signal development over time (k), and green channel signal in the frequency domain (l) in video with a spatiotemporal resolution of 1920 × 1080 px2, 60 fps (Additional file 4, third part). mp Single frame (m), vertical scan line (n), gill and background signal development over time (o), and green channel signal in the frequency domain (p) in video with a spatiotemporal resolution of 1920 × 1080 px2, 30 fps (Additional file 4, fourth part). qt Single frame (q), vertical scan line (r), gill and background signal development over time (s), and green channel signal in the frequency domain (t) in video with a spatiotemporal resolution of 1280 × 720 px2, 30 fps (Additional file 4, fifth part). uy Single frame (u), vertical scan line (v), gill and background signal development over time (x), and green channel signal in the frequency domain (y) in video with a spatiotemporal resolution of 640 × 480 px2, 30 fps (Additional file 4, sixth part). Video frames are scaled relatively in spatial size to each other. All applied video formats allowed for heart rate detection on the anesthetized axolotl

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