Low Complexity Continuous Rain Density Estimation Using RISTA Technique for Single Image Rain Streak Removal
Ko-Yang Chao, Yu-Hsuan Lee · 2024
Image deraining is an image processing technique to restore a rainy image back to rain-free one. Iterative Soft Thresholding Algorithm (ISTA) is an iterative procedure to estimate sparsity. ISTA demands considerable computation burdens of Floating Point Operations (FLOPs), limiting its applications for real-time requirement. The proposed Restored-Feature Iterative Soft Thresholding Algorithm (RISTA) provides a low complexity approach to reduce FLOPs. Experiment results demonstrate this work has a computation saving ratio up to 66%, while maintaining a Peak Signal-to-Noise Ratio (PSNR) error as low as 6%.