Zero-Reference Deep Curve Estimation for Low-Light Image ...
Zero-Reference Deep Curve Estimation for Low-Light Image EnhancementChunle Guo1,2 Chongyi Li1,2 Jichang Guo1 Chen Change Loy3Junhui Hou2Sam Kwong2Runmin Cong41BIIT Lab, Tianjin University2City University of Hong Kong3Nanyang Technological University4Beijing Jiaotong paper presents a novel method, Zero-ReferenceDeep Curve Estimation (Zero-DCE), which formulates lightenhancement as a task of Image -specific Curve estimationwith a deep network. Our method trains a lightweight deepnetwork, DCE-Net, to estimate pixel-wise and high-ordercurves for dynamic range adjustment of a given Image . Thecurve Estimation is specially designed, considering pixelvalue range, monotonicity, and differentiability. Zero-DCEis appealing in its relaxed assumption on reference images, , it does not require any paired or unpaired data dur-ing training.
Net [20] was trained on data simulated on random Gamma correction; the LOL dataset [32] of paired low/normal light images was collected through altering the exposure time and ISO during image acquisition; the MIT-Adobe FiveK dataset [3] comprises 5,000 raw images, each of which has five retouched images produced by trained experts.
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