<p>Non-uniform lighting images (NULIs) are a major challenge in image enhancement. Inspired by the human retina, in this paper a retina-like dynamic lighting-aware network (RDLAN) is designed to learn a weight map <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:W(x,\:y)\:\)</EquationSource> </InlineEquation> from NULI, and a dual gamma corrector with one brightener with γ = 0.4 and one dimmer with γ = 2.5 is developed to enhance NULI through guidance by the learned <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:W(x,\:y)\)</EquationSource> </InlineEquation>. After finding the structural consistency property, we revise the structural similarity (SSIM) to build a non-reference SSIM loss with weight-consistent loss and mean filtering loss. Our algorithm is evaluated on two fully reference datasets (LOL-eval15 and VE-LOL-L-cap), two non-reference datasets (DICM and MEF) and a real-world video dataset (SDE). The experimental results show that our algorithm outperforms some SOTAs of image enhancements, and that RDLAN is able to estimate better weight maps than other lighting-aware networks.</p>

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Image enhancement based on a retina-like dynamic lighting-aware network

  • Ke-Fa Xu,
  • Qin-Xia Hu,
  • Zi-Shen Huang,
  • Xiao Hu

摘要

Non-uniform lighting images (NULIs) are a major challenge in image enhancement. Inspired by the human retina, in this paper a retina-like dynamic lighting-aware network (RDLAN) is designed to learn a weight map \(\:W(x,\:y)\:\) from NULI, and a dual gamma corrector with one brightener with γ = 0.4 and one dimmer with γ = 2.5 is developed to enhance NULI through guidance by the learned \(\:W(x,\:y)\) . After finding the structural consistency property, we revise the structural similarity (SSIM) to build a non-reference SSIM loss with weight-consistent loss and mean filtering loss. Our algorithm is evaluated on two fully reference datasets (LOL-eval15 and VE-LOL-L-cap), two non-reference datasets (DICM and MEF) and a real-world video dataset (SDE). The experimental results show that our algorithm outperforms some SOTAs of image enhancements, and that RDLAN is able to estimate better weight maps than other lighting-aware networks.