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Fig. 4 | BMC Biology

Fig. 4

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

Fig. 4

Heart rate detection in colored animal and in multi-animal setup. a Single frame from motion magnified video of brown wild-type axolotl (Additional file 5). b Proximal limb and background signal (yellow and gray lines in a) development over time (green channel). c Fourier-transformed green channel signal in b in the frequency domain. Although the enhanced motion signal related to the heart beat of the colored animal is less pronounced relatively to the color change signal in leucistic animals (see Figs. 1, 2 and 3), a heart rate measurement is still measureable. d Single frame from color-magnified video of a multi-animal setup containing six resting axolotls (Additional file 6). e Cervical and background signal (yellow and white rings in d) development over time of each of the six axolotls in d (green channel). f-k Fourier-transformed green channel signals in e in the frequency domain. Resting heart rate varied between 14.07 and 28.13 BPM

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