Figure 12.

Tracking error η and residual motion artifacts ${\tilde{m}}^{*}$ in synthetic, tracked and motion-stabilized optical maps with various amplitudes of motion and relative signal strengths. (A) Tracking error η within video image averaged over all video frames with contrast-enhancement (LK_c). Within the video image errors are acceptable (< 0.5 pixel), toward the boundaries errors can become large (η > 2 pixel). Video image is 100 × 100 pixel in size. See also Supplementary Video 4. (B) Tracking error η with (LK_c) and without (LK) contrast-enhancement. Tracking error grows exponentially with increasing signal-to-contrast ratio f_c without image contrast-enhancement (LK) and remains small with image contrast-enhancement (LK_c) for all signal-to-contrast ratios f_c. (C) Residual motion artifacts ${\tilde{m}}^{*}$ are equally small (cf. Figure 10E) for small and large amplitudes of motion in the original videos. (D) Residual motion artifacts ${\tilde{m}}^{*}$ are minimal for relative signal strengths in the range of f_c = 0.5 − 2.0 or when f ≈ c.