Figure 7. Schematic diagram of dilation convolution.

(A) It shows the visual field effect of the classical 3 × 3 convolution kernel, covering 3 × 3 field of view each time (purple part of figure (A)); (B) corresponds to 3 × 3 with r = 2. Though the size of the convolution kernel is still 3 × 3, but the receptive field of convolution kernel is increased to 7 × 7 (purple and green parts in figure (B)); (C) corresponds to 3 × 3 with r = 3 and a receptive field of 15 × 15.