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. 2021 Jul 23;12(8):5227–5245. doi: 10.1364/BOE.423508

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Fig. 2. — Illustration for traditional R_B channels method, including: (a) original RGB signals; (b) AC components, where $A C_{R e d} & A C_{B l u e}$ are the standard deviations (SD) of the data in sliding-window; (c) DC components, where $D C_{B l u e} & D C_{R e d}$ are the mean values of the data in sliding-window.