(Preprint) Real-time Image Enhancer via Learnable Spatial-aware 3D Lookup Tables
Tao Wang 汪涛, Yong Li 李勇, Jingyang Peng 彭竞阳, Yipeng Ma 马翼鹏, Xian Wang 王宪, Fenglong Song 宋风龙, Youliang Yan 颜友亮
¹ Huawei Noah’s Ark Lab
中国 华为诺亚方舟实验室
arXiv, 2021-08-19

Recently, deep learning-based image enhancement algorithms achieved state-of-the-art (SOTA) performance on several publicly available datasets. However, most existing methods fail to meet practical requirements either for visual perception or for computation efficiency, especially for high-resolution images. In this paper, we propose a novel real-time image enhancer via learnable spatial-aware 3-dimentional lookup tables(3D LUTs), which well considers global scenario and local spatial information. Specifically, we introduce a light weight two-head weight predictor that has two outputs. One is a 1D weight vector used for image-level scenario adaptation, the other is a 3D weight map aimed for pixel-wise category fusion.

We learn the spatial-aware 3D LUTs and fuse them according to the aforementioned weights in an end-to-end manner. The fused LUT is then used to transform the source image into the target tone in an efficient way. Extensive results show that our model outperforms SOTA image enhancement methods on public datasets both subjectively and objectively, and that our model only takes about 4ms to process a 4K resolution image on one NVIDIA V100 GPU.
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