Table 1.

Comparison of our FCNx architecture with FCN8 and U-Net architectures.

Network	Architecture	Skip Connection Operation	Residual Connections
FCN8 [23]	Asymmetrical encoder-decoder base	Skip connections between the encoder and the decoder using element-wise sum operator	Three convolution groups for three downsampling layers before the upsampling path
U-Net [43]	Symmetrical encoder-decoder base	Skip connections between the encoder and the decoder using concatenation operator	All downsampling layers information is passed to the upsampling path
FCNx (Our model)	Asymmetrical encoder-decoder base	Skip connections between the encoder and the decoder using element-wise sum operator	Four convolution groups for three downsampling layers before the upsampling path