Fig. 3.

(a) The proposed 3D multi-model VggNet (3DMM-VggNet), where the symbols “MP” and “FC” represent the max pooling operation and the fully connected operation, respectively. (b) The structural diagram of 3D convolution block (3D-ConvBlock) in which the symbols “k,” “BN,” and “PReLU” represent the number of channels, the batch normalization operation, and the nonlinear activation function, respectively. In addition, unlike the traditional 3D input, the fourth dimension of the proposed input data has two channels, one is the original image and the other is its corresponding enhanced image