We present a novel camera path optimization framework for the task of online video stabilization. Typically, a stabilization pipeline consists of three steps: motion estimating, path smoothing, and novel view rendering. Most previous methods concentrate on motion estimation, proposing various global or local motion models. In contrast, path optimization receives relatively less attention, especially in the important online setting, where no future frames are available. In this work, we adopt recent off-the-shelf high-quality deep motion models for the motion estimation to recover the camera trajectory and focus on the latter two steps. Our network takes a short 2D camera path in a sliding window as input and outputs the stabilizing warp field of the last frame in the window, which warps the coming frame to its stabilized position. A hybrid loss is well-defined to constrain the spatial and temporal consistency. In addition, we build a motion dataset that contains stable and unstable motion pairs for the training. Extensive experiments demonstrate that our approach significantly outperforms state-of-the-art online methods both qualitatively and quantitatively and achieves comparable performance to offline methods.

高动态范围（HDR）DEGHOSTING算法旨在生成具有现实细节的无幽灵HDR图像。受到接收场的局部性的限制，现有的基于CNN的方法通常容易产生大型运动和严重饱和的情况下产生鬼影和强度扭曲。在本文中，我们提出了一种新颖的背景感知视觉变压器（CA-VIT），用于无幽灵的高动态范围成像。 CA-VIT被设计为双分支结构，可以共同捕获全球和本地依赖性。具体而言，全球分支采用基于窗口的变压器编码器来建模远程对象运动和强度变化以解决hosting。对于本地分支，我们设计了局部上下文提取器（LCE）来捕获短范围的图像特征，并使用频道注意机制在提取的功能上选择信息丰富的本地详细信息，以补充全局分支。通过将CA-VIT作为基本组件纳入基本组件，我们进一步构建了HDR-Transformer，这是一个分层网络，以重建高质量的无幽灵HDR图像。在三个基准数据集上进行的广泛实验表明，我们的方法在定性和定量上优于最先进的方法，而计算预算大大降低。代码可从https://github.com/megvii-research/hdr-transformer获得

基于卷积神经网络（CNN）的方法提供了有效的解决方案，以增强压缩图像和视频的质量。但是，这些方法忽略了使用原始数据增强质量的方法。在本文中，我们通过提出一种基于在线学习的方法来采用HEVC内编码图像的质量增强质量增强图。当需要增强质量时，我们在线训练我们在编码器端提出的模型，然后使用参数来更新解码器端的模型。该方法不仅可以改善模型性能，而且还可以使一个模型可用于多个编码方案。此外，离散余弦变换（DCT）系数中的量化误差是各种HEVC压缩伪像的根本原因。因此，我们结合了频域先验以协助图像重建。我们设计了基于DCT的卷积层，以生成适合CNN学习的DCT系数。实验结果表明，与最先进的方法相比，我们提出的基于在线学习的双域网络（OL-DN）取得了出色的性能。

在本文中，我们提出了用于HEVC内部编码的亮度引导的色彩图像增强卷积神经网络。具体而言，我们首先开发一个封闭式的递归不对称卷积块，以恢复每个降解的镀铬图像，从而生成中间输出。然后，在亮度图像的引导下，该中间输出的质量进一步改善，最终产生了高质量的色彩图像。当我们提出的方法在用HEVC内部编码的颜色图像压缩中采用时，它分别获得了U和V图像的HEVC比HEVC的28.96％和16.74％的BD速率增益，因此，这表明了其优越性。

本文提出了一种有效融合多暴露输入并使用未配对数据集生成高质量的高动态范围（HDR）图像的方法。基于深度学习的HDR图像生成方法在很大程度上依赖于配对的数据集。地面真相图像在生成合理的HDR图像中起着领导作用。没有地面真理的数据集很难应用于训练深层神经网络。最近，在没有配对示例的情况下，生成对抗网络（GAN）证明了它们将图像从源域X转换为目标域y的潜力。在本文中，我们提出了一个基于GAN的网络，用于解决此类问题，同时产生愉快的HDR结果，名为Uphdr-Gan。提出的方法放松了配对数据集的约束，并了解了从LDR域到HDR域的映射。尽管丢失了这些对数据，但UPHDR-GAN可以借助修改后的GAN丢失，改进的歧视器网络和有用的初始化阶段正确处理由移动对象或未对准引起的幽灵伪像。所提出的方法保留了重要区域的细节并提高了总图像感知质量。与代表性方法的定性和定量比较证明了拟议的UPHDR-GAN的优越性。

本文提出了一种基于生成的对抗网络（GAN）的解决方案，用于求解拼图游戏。问题假定图像被分成相等的方块，并要求根据碎片提供的信息恢复图像。传统的拼图拼写求解器通常根据拼写的边界确定关系，这忽略了重要的语义信息。在本文中，我们提出了一种基于GaN的辅助学习方法，用于用未配对的图像求解拼图拼图的GaN的辅助学习方法（没有初始图像的先验知识）。我们设计了一个多任务管道，包括（1）分类分支来对拼图排列，并且（2）GaN分支以正确的顺序恢复图像的图像。分类分支由根据洗片件产生的伪标签约束。 GaN分支专注于图像语义信息，其中发电机产生自然图像以欺骗鉴别器，而判别器区分给定图像是否属于合成或真实目标域。这两个分支通过流动的扭曲模块连接，该模块应用于扭曲特征以根据分类结果校正订单。所提出的方法可以通过同时利用语义信息和边界信息来更有效地解决拼图难题。针对几个代表性拼图求解器的定性和定量比较证明了我们方法的优越性。

Increasing research interests focus on sequential recommender systems, aiming to model dynamic sequence representation precisely. However, the most commonly used loss function in state-of-the-art sequential recommendation models has essential limitations. To name a few, Bayesian Personalized Ranking (BPR) loss suffers the vanishing gradient problem from numerous negative sampling and predictionbiases; Binary Cross-Entropy (BCE) loss subjects to negative sampling numbers, thereby it is likely to ignore valuable negative examples and reduce the training efficiency; Cross-Entropy (CE) loss only focuses on the last timestamp of the training sequence, which causes low utilization of sequence information and results in inferior user sequence representation. To avoid these limitations, in this paper, we propose to calculate Cumulative Cross-Entropy (CCE) loss over the sequence. CCE is simple and direct, which enjoys the virtues of painless deployment, no negative sampling, and effective and efficient training. We conduct extensive experiments on five benchmark datasets to demonstrate the effectiveness and efficiency of CCE. The results show that employing CCE loss on three state-of-the-art models GRU4Rec, SASRec, and S3-Rec can reach 125.63%, 69.90%, and 33.24% average improvement of full ranking NDCG@5, respectively. Using CCE, the performance curve of the models on the test data increases rapidly with the wall clock time, and is superior to that of other loss functions in almost the whole process of model training.

The utilization of large-scale distributed renewable energy promotes the development of the multi-microgrid (MMG), which raises the need of developing an effective energy management method to minimize economic costs and keep self energy-sufficiency. The multi-agent deep reinforcement learning (MADRL) has been widely used for the energy management problem because of its real-time scheduling ability. However, its training requires massive energy operation data of microgrids (MGs), while gathering these data from different MGs would threaten their privacy and data security. Therefore, this paper tackles this practical yet challenging issue by proposing a federated multi-agent deep reinforcement learning (F-MADRL) algorithm via the physics-informed reward. In this algorithm, the federated learning (FL) mechanism is introduced to train the F-MADRL algorithm thus ensures the privacy and the security of data. In addition, a decentralized MMG model is built, and the energy of each participated MG is managed by an agent, which aims to minimize economic costs and keep self energy-sufficiency according to the physics-informed reward. At first, MGs individually execute the self-training based on local energy operation data to train their local agent models. Then, these local models are periodically uploaded to a server and their parameters are aggregated to build a global agent, which will be broadcasted to MGs and replace their local agents. In this way, the experience of each MG agent can be shared and the energy operation data is not explicitly transmitted, thus protecting the privacy and ensuring data security. Finally, experiments are conducted on Oak Ridge national laboratory distributed energy control communication lab microgrid (ORNL-MG) test system, and the comparisons are carried out to verify the effectiveness of introducing the FL mechanism and the outperformance of our proposed F-MADRL.

This paper presents a safety-critical locomotion control framework for quadrupedal robots. Our goal is to enable quadrupedal robots to safely navigate in cluttered environments. To tackle this, we introduce exponential Discrete Control Barrier Functions (exponential DCBFs) with duality-based obstacle avoidance constraints into a Nonlinear Model Predictive Control (NMPC) with Whole-Body Control (WBC) framework for quadrupedal locomotion control. This enables us to use polytopes to describe the shapes of the robot and obstacles for collision avoidance while doing locomotion control of quadrupedal robots. Compared to most prior work, especially using CBFs, that utilize spherical and conservative approximation for obstacle avoidance, this work demonstrates a quadrupedal robot autonomously and safely navigating through very tight spaces in the real world. (Our open-source code is available at github.com/HybridRobotics/quadruped_nmpc_dcbf_duality, and the video is available at youtu.be/p1gSQjwXm1Q.)

Patients take care of what their teeth will be like after the orthodontics. Orthodontists usually describe the expectation movement based on the original smile images, which is unconvincing. The growth of deep-learning generative models change this situation. It can visualize the outcome of orthodontic treatment and help patients foresee their future teeth and facial appearance. While previous studies mainly focus on 2D or 3D virtual treatment outcome (VTO) at a profile level, the problem of simulating treatment outcome at a frontal facial image is poorly explored. In this paper, we build an efficient and accurate system for simulating virtual teeth alignment effects in a frontal facial image. Our system takes a frontal face image of a patient with visible malpositioned teeth and the patient's 3D scanned teeth model as input, and progressively generates the visual results of the patient's teeth given the specific orthodontics planning steps from the doctor (i.e., the specification of translations and rotations of individual tooth). We design a multi-modal encoder-decoder based generative model to synthesize identity-preserving frontal facial images with aligned teeth. In addition, the original image color information is used to optimize the orthodontic outcomes, making the results more natural. We conduct extensive qualitative and clinical experiments and also a pilot study to validate our method.