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Fig. 7 | BMC Biology

Fig. 7

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

Fig. 7

Signal detection with Eulerian video magnification in non-dedicated videographic material. a Single frame from motion magnified video of sand lizard. Video was located on Flickr and used with permission from Ben Locke. b Heart, lung, and background signal (yellow and gray lines in a) development over time (blue channel). c Fourier-transformed blue channel signal of heartbeat and respiration in b in the frequency domain. d, e Single-frame color-magnified video of a drinking giraffe (d) that eventually lift its head (e). Video was located on YouTube and used with permission from AliasAnimo. f, g Arteria tibialis posterior and background signal (yellow and gray rings in d and e) development over time (green channel). The low number of cardiac cycles in the timespan of the two postures does not allow for meaningful Fourier transformation; thus, heart rate is estimated as an average of the available signal periods for the two postures (5 periods during head down, one period during head up)

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