Figure 4
From: Low-light image enhancement via adaptive frequency decomposition network
Extracting visual feature maps of different layers based on pre-trained U-Net. The first row is the result of normal U-Net output, and the second row is the result of embedding AFD module on top of it. The high-frequency information extracted at larger scales (i.e. T1 and T2) mainly contains local detail information; the low-frequency information at smaller scales (i.e. T3 and T4) mainly contains global information.
