WV-LUT: Wide Vision Lookup Tables for Real-Time Low-Light Image Enhancement

In recent years, the lookup tables (LUTs) with deep learning for image enhancement have achieved remarkable results with extremely high inference efficiency. However, when dealing with severely degraded low-light images, lookup-table-based methods tend to exhibit poor enhancement results due to the lack of contextual and global information. To address the limitations of current lookup-table-based methods in the low-light image enhancement task, we propose the novel Wide Vision Lookup Tables (WV-LUT) by introducing Complementary-Hierarchical 4D-LUTs into 3D-LUT, which allows 3D-LUT to have a wider range of vision. Specifically, the 4D-LUTs are used to expand the receptive field and process local information on a single channel, while a 3D-LUT is used for sRGB channel post-processing. Additionally, we propose a lightweight Global Adjustment Module that further enhances the performance and generalization of WV-LUT by obtaining global adjustment parameters for gamma and color correction matrix to adaptively process images. Experimental results demonstrate that our method outperforms other state-of-the-art methods in low-light image enhancement with the highest average ranking and superior inference efficiency. Furthermore, deployment experiments on mobile devices demonstrate that our WV-LUT achieves superior results and inference efficiency, showcasing promising application prospects for edge devices.