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. 2022 Jun;12(6):3454–3479. doi: 10.21037/qims-21-939

Figure 7.

Figure 7

The network structure of CNN and U-Net (U-Net is a typical convolutional neural network (42), it has a contracting path for image downsampling and an expansive path for image upsampling). (A) CNN, (B) U-Net. Note: Stacked feature maps are a group of feature maps generated by the previous convolution, nonlinear or pooling layer. CNN, convolutional neural networks.