Figure 4 | Scientific Reports

Figure 4

From: Digital image processing to detect subtle motion in stony coral

Figure 4

Optical flow of the coral tissue surface. (a,b) Optical flow between the second and first pictures from day and night, respectively. White circles mark the position of polyps. (c) The percentage histograms of velocities \(v_{x}\) and \(v_{y}\) along horizontal and vertical directions. The red and blue curves indicate the means of each velocity from day and night. The pink and cyan regions are variations between day and night. (d) The percentage histogram of direction of velocity. The red and blue curves indicate the means of each angle from day and night. The pink and cyan regions are variations during day and night.

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