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Existing methods for single images raindrop removal either have poor robustness or suffer from parameter burdens. In this paper, we propose a new Adjacent Aggregation Network (A<sup>2</sup>Net) with lightweight architectures to remove raindrops from single images. Instead of directly cascading convolutional layers, we design an adjacent aggregation architecture to better fuse features for rich representations generation, which can lead to high quality images reconstruction. To further simplify the learning process, we utilize a problem-specific knowledge to force the network focus on the luminance channel in the YUV color space instead of all RGB channels. By combining adjacent aggregating operation with color space transformation, the proposed A<sup>2</sup>Net can achieve state-of-the-art performances on raindrop removal with significant parameters reduction.

A2Net: Adjacent Aggregation Networks for Image Raindrop Removal

A²Net: Adjacent Aggregation Networks for Image Raindrop Removal