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Fig. 1 | BMC Biology

Fig. 1

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

Fig. 1

Overview and example of Eulerian video magnification procedure. a Block diagram representing the processing steps of a Eulerian Video Magnification procedure resulting in a signal read of the signal of interest or a gating signal for another imaging procedure. b Four frames from original input video source of anesthetized axolotl (Additional file 1, left trace). c Vertical scan line from the input source over time. d Magnification of box in b showing the cardiac region of the input video. No obvious color changes resulting from the beating heart. e The same four frames as in b with the axolotl’s pulse signal magnified. f Same scan line over time as in c but on color-magnified video. Color fluctuations are visible. g Magnification of box in e. Color changes are present over time in the cardiac region. h Four frames of brightness mode echocardiography recorded simultaneously with input video. The frames match the same time points as in b, d, e, g. i Pulsed-wave Doppler recording of blood flow in the ventricle. Note that peak flow matches lines in f, demonstrating that color changes in magnified video result from the beating heart

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