N-LoLiGan: Unsupervised low-light enhancement GAN with an N-Net for low-light tunnel images. - Jing Wang 050; Ganghua Xiao; Hongliang Zhu; Wenhao Li; Jinqiao Cui; Yuzhuang Wan; Zhengfang Wang; Qingmei Sui (Digit. Signal Process., 2023)