Fig. 7

Comparison of transmittance: (a) denotes the primitive transmission rate, (b) denotes the transmission with the guide filter and (c) denotes the transmittance with the guide filter and nonlinear transformation.

Comparison of transmittance: (a) denotes the primitive transmission rate, (b) denotes the transmission with the guide filter and (c) denotes the transmittance with the guide filter and nonlinear transformation.