Structure-Preserving Deraining with Residue Channel Prior Guidance

TL;DR

This paper introduces SPDNet, a novel deraining network that preserves image structure by utilizing Residue Channel Prior guidance and multi-level wavelet modules, achieving state-of-the-art results on synthetic and real datasets.

Contribution

The paper proposes a structure-preserving deraining network guided by Residue Channel Prior, with a wavelet-based backbone and iterative refinement, advancing rain removal techniques without relying on rain-generating assumptions.

Findings

Achieves superior deraining performance on synthetic datasets.

Effectively preserves image structure in real-world scenarios.

Outperforms existing methods with state-of-the-art results.

Abstract

Single image deraining is important for many high-level computer vision tasks since the rain streaks can severely degrade the visibility of images, thereby affecting the recognition and analysis of the image. Recently, many CNN-based methods have been proposed for rain removal. Although these methods can remove part of the rain streaks, it is difficult for them to adapt to real-world scenarios and restore high-quality rain-free images with clear and accurate structures. To solve this problem, we propose a Structure-Preserving Deraining Network (SPDNet) with RCP guidance. SPDNet directly generates high-quality rain-free images with clear and accurate structures under the guidance of RCP but does not rely on any rain-generating assumptions. Specifically, we found that the RCP of images contains more accurate structural information than rainy images. Therefore, we introduced it to our deraining network to protect structure information of the rain-free image. Meanwhile, a Wavelet-based Multi-Level Module (WMLM) is proposed as the backbone for learning the background information of rainy images and an Interactive Fusion Module (IFM) is designed to make full use of RCP information. In addition, an iterative guidance strategy is proposed to gradually improve the accuracy of RCP, refining the result in a progressive path. Extensive experimental results on both synthetic and real-world datasets demonstrate that the proposed model achieves new state-of-the-art results. Code: https://github.com/Joyies/SPDNet