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. Author manuscript; available in PMC: 2023 May 26.
Published in final edited form as: Opt Lett. 2021 Jul 15;46(14):3392–3395. doi: 10.1364/OL.428538

Fig. 2.

Fig. 2.

RBC spatiotemporal trace enhancement. (a) Raw RBC spatiotemporal trace image. (b) The direction of the RBC traces θt was detected by using the Radon transform. (c) The Gabor filter was applied to RBC traces along the direction θt to improve the continuity. (d) The RBC trace image was enhanced by a square operator. (e) An image erosion operator was applied to panel (d). (f) The RBC traces were further enhanced by Jerman’s vesselness filter. (g) The RBC traces were binarized by Otsu’s adaptive threshold.