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        Conflict Graph-based Downlink Resource Allocation and Scheduling for Indoor Visible Light Communications

        Huanlin Liu,Hongyue Dai,Yong Chen,Peijie Xia 한국광학회 2016 Current Optics and Photonics Vol.20 No.1

        Visible Light Communication (VLC) using Light Emitting Diodes (LEDs) within the existing lightinginfrastructure can reduce the implementation cost and may gain higher throughput than radio frequency(RF) or Infrared (IR) based wireless systems. Current indoor VLC systems may suffer from poor downlinkresource allocation problems and small system throughput. To address these two issues, we propose analgorithm called a conflict graph scheduling (CGS) algorithm, including a conflict graph and a schemethat is based on the conflict graph. The conflict graph can ensure that users are able to transmit datawithout interference. The scheme considers the user fairness and system throughput, so that they both canget optimum values. Simulation results show that the proposed algorithm can guarantee significantimprovement of system throughput under the premise of fairness.

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        GAN-Based Local Lightness-Aware Enhancement Network for Underexposed Images

        Yong Chen,Meiyong Huang,Huanlin Liu,Jinliang Zhang,Kaixin Shao 한국정보처리학회 2022 Journal of information processing systems Vol.18 No.4

        Uneven light in real-world causes visual degradation for underexposed regions. For these regions, insufficientconsideration during enhancement procedure will result in over-/under-exposure, loss of details and colordistortion. Confronting such challenges, an unsupervised low-light image enhancement network is proposed inthis paper based on the guidance of the unpaired low-/normal-light images. The key components in our networkinclude super-resolution module (SRM), a GAN-based low-light image enhancement network (LLIEN), anddenoising-scaling module (DSM). The SRM improves the resolution of the low-light input images beforeillumination enhancement. Such design philosophy improves the effectiveness of texture details preservationby operating in high-resolution space. Subsequently, local lightness attention module in LLIEN effectivelydistinguishes unevenly illuminated areas and puts emphasis on low-light areas, ensuring the spatial consistencyof illumination for locally underexposed images. Then, multiple discriminators, i.e., global discriminator, localregion discriminator, and color discriminator performs assessment from different perspectives to avoid over-/under-exposure and color distortion, which guides the network to generate images that in line with humanaesthetic perception. Finally, the DSM performs noise removal and obtains high-quality enhanced images. Bothqualitative and quantitative experiments demonstrate that our approach achieves favorable results, whichindicates its superior capacity on illumination and texture details restoration.

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