我们提出了一种新颖的面部表情识别网络，称为您的注意网络（DAN）分散注意力。我们的方法基于两个关键观察。首先，多个类分享了固有的相似潜在的面部外观，它们的差异可能是微妙的。其次，面部表达式同时通过多个面部区域表现出来，并且通过编码本地特征之间的高阶相互作用，识别需要整体方法。为解决这些问题，我们提出了我们的丹与三个关键组件：特征聚类网络（FCN），多头跨关注网络（MAN）和注意融合网络（AFN）。 FCN通过采用大幅学习目的来提取强大的功能，以最大限度地提高级别可分离性。此外，该人实例化了许多关注头，同时参加多个面部面积，并在这些地区构建注意地图。此外，AFN在将注意力映射融合到全面的位置之前，将这些关注分散到多个位置。在三个公共数据集（包括EffectNet，RAF-DB和SFew 2.0）上进行广泛的实验验证了所提出的方法始终如一地实现最先进的面部表情识别性能。代码将在https://github.com/yaoing/dan提供。

Multi-view data containing complementary and consensus information can facilitate representation learning by exploiting the intact integration of multi-view features. Because most objects in real world often have underlying connections, organizing multi-view data as heterogeneous graphs is beneficial to extracting latent information among different objects. Due to the powerful capability to gather information of neighborhood nodes, in this paper, we apply Graph Convolutional Network (GCN) to cope with heterogeneous-graph data originating from multi-view data, which is still under-explored in the field of GCN. In order to improve the quality of network topology and alleviate the interference of noises yielded by graph fusion, some methods undertake sorting operations before the graph convolution procedure. These GCN-based methods generally sort and select the most confident neighborhood nodes for each vertex, such as picking the top-k nodes according to pre-defined confidence values. Nonetheless, this is problematic due to the non-differentiable sorting operators and inflexible graph embedding learning, which may result in blocked gradient computations and undesired performance. To cope with these issues, we propose a joint framework dubbed Multi-view Graph Convolutional Network with Differentiable Node Selection (MGCN-DNS), which is constituted of an adaptive graph fusion layer, a graph learning module and a differentiable node selection schema. MGCN-DNS accepts multi-channel graph-structural data as inputs and aims to learn more robust graph fusion through a differentiable neural network. The effectiveness of the proposed method is verified by rigorous comparisons with considerable state-of-the-art approaches in terms of multi-view semi-supervised classification tasks.

Federated Learning (FL) is pervasive in privacy-focused IoT environments since it enables avoiding privacy leakage by training models with gradients instead of data. Recent works show the uploaded gradients can be employed to reconstruct data, i.e., gradient leakage attacks, and several defenses are designed to alleviate the risk by tweaking the gradients. However, these defenses exhibit weak resilience against threatening attacks, as the effectiveness builds upon the unrealistic assumptions that deep neural networks are simplified as linear models. In this paper, without such unrealistic assumptions, we present a novel defense, called Refiner, instead of perturbing gradients, which refines ground-truth data to craft robust data that yields sufficient utility but with the least amount of privacy information, and then the gradients of robust data are uploaded. To craft robust data, Refiner promotes the gradients of critical parameters associated with robust data to close ground-truth ones while leaving the gradients of trivial parameters to safeguard privacy. Moreover, to exploit the gradients of trivial parameters, Refiner utilizes a well-designed evaluation network to steer robust data far away from ground-truth data, thereby alleviating privacy leakage risk. Extensive experiments across multiple benchmark datasets demonstrate the superior defense effectiveness of Refiner at defending against state-of-the-art threats.

在不同模型中，对抗性示例（AES）的可传递性对于黑盒对抗攻击至关重要，在黑框对抗攻击中，攻击者无法访问有关黑盒模型的信息。但是，制作的AE总是表现出差的可转移性。在本文中，通过将AES作为模型的概括能力的可传递性，我们揭示了Vanilla Black-Box攻击通过解决最大似然估计（MLE）问题来制作AES。对于MLE，结果可能是特定于模型的本地最佳最佳，当可用数据较小时，即限制了AE的可传递性。相比之下，我们将可转移的AES重新构建为最大化后验概率估计问题，这是一种有效的方法，可以提高结果有限的结果的概括。由于贝叶斯后推断通常很棘手，因此开发了一种简单而有效的方法称为MaskBlock以近似估计。此外，我们表明该配方框架是各种攻击方法的概括版本。广泛的实验说明了面具可以显着提高制作的对抗性例子的可转移性，最多可以提高20％。

神经网络的不透明度导致其脆弱性发生后门攻击，其中触发了感染神经元的隐藏注意力，以覆盖对攻击者选择的神经元的正常预测。在本文中，我们提出了一种新型的后门防御方法，以标记和净化后门神经网络中受感染的神经元。具体来说，我们首先定义了一个名为良性显着性的新指标。通过将一阶梯度组合以保持神经元之间的连接，良性显着性可以鉴定出比后门防御中常用度量的高精度的感染神经元。然后，提出了一种新的自适应正则化（AR）机制，以通过微调来帮助净化这些被鉴定的感染神经元。由于能够适应不同参数幅度的能力，与神经元纯化中的共同正则化机制相比，AR可以提供更快，更稳定的收敛性。广泛的实验结果表明，我们的方法可以消除具有可忽略的性能降解的神经网络中的后门。

通过移动激光扫描和图像构建有色点的云是测量和映射的基本工作。它也是为智能城市建造数字双胞胎的重要先决条件。但是，现有的公共数据集要么是相对较小的规模，要么缺乏准确的几何和彩色地面真理。本文记录了一个名为Polyu-BPComa的多功能数据集，该数据集可独特地定位于移动着色映射。该数据集在背包平台上包含3D激光雷达，球形成像，GNSS和IMU的资源。颜色检查器板在每个调查区域粘贴，因为目标和地面真相数据是由先进的陆地激光扫描仪（TLS）收集的。 3D几何信息和颜色信息可以分别在背包系统和TLS产生的有色点云中恢复。因此，我们提供了一个机会，可以同时为移动多感官系统对映射和着色精度进行基准测试。该数据集的尺寸约为800 GB，涵盖室内和室外环境。数据集和开发套件可在https://github.com/chenpengxin/polyu-bpcoma.git上找到。

这项工作为聚类提供了无监督的深入判别分析。该方法基于深层神经网络，旨在最大程度地减少群集内差异，并以无监督的方式最大化集群间差异。该方法能够将数据投射到具有紧凑和不同分布模式的非线性低维潜在空间中，以便可以有效地识别数据簇。我们进一步提供了该方法的扩展，以便可以有效利用可用的图形信息来提高聚类性能。带有或没有图形信息的图像和非图像数据的广泛数值结果证明了所提出的方法的有效性。

Unsupervised domain adaptation (UDA) for semantic segmentation is a promising task freeing people from heavy annotation work. However, domain discrepancies in low-level image statistics and high-level contexts compromise the segmentation performance over the target domain. A key idea to tackle this problem is to perform both image-level and feature-level adaptation jointly. Unfortunately, there is a lack of such unified approaches for UDA tasks in the existing literature. This paper proposes a novel UDA pipeline for semantic segmentation that unifies image-level and feature-level adaptation. Concretely, for image-level domain shifts, we propose a global photometric alignment module and a global texture alignment module that align images in the source and target domains in terms of image-level properties. For feature-level domain shifts, we perform global manifold alignment by projecting pixel features from both domains onto the feature manifold of the source domain; and we further regularize category centers in the source domain through a category-oriented triplet loss and perform target domain consistency regularization over augmented target domain images. Experimental results demonstrate that our pipeline significantly outperforms previous methods. In the commonly tested GTA5$\rightarrow$Cityscapes task, our proposed method using Deeplab V3+ as the backbone surpasses previous SOTA by 8%, achieving 58.2% in mIoU.

Compressed videos often exhibit visually annoying artifacts, known as Perceivable Encoding Artifacts (PEAs), which dramatically degrade video visual quality. Subjective and objective measures capable of identifying and quantifying various types of PEAs are critical in improving visual quality. In this paper, we investigate the influence of four spatial PEAs (i.e. blurring, blocking, bleeding, and ringing) and two temporal PEAs (i.e. flickering and floating) on video quality. For spatial artifacts, we propose a visual saliency model with a low computational cost and higher consistency with human visual perception. In terms of temporal artifacts, self-attention based TimeSFormer is improved to detect temporal artifacts. Based on the six types of PEAs, a quality metric called Saliency-Aware Spatio-Temporal Artifacts Measurement (SSTAM) is proposed. Experimental results demonstrate that the proposed method outperforms state-of-the-art metrics. We believe that SSTAM will be beneficial for optimizing video coding techniques.

Image Virtual try-on aims at replacing the cloth on a personal image with a garment image (in-shop clothes), which has attracted increasing attention from the multimedia and computer vision communities. Prior methods successfully preserve the character of clothing images, however, occlusion remains a pernicious effect for realistic virtual try-on. In this work, we first present a comprehensive analysis of the occlusions and categorize them into two aspects: i) Inherent-Occlusion: the ghost of the former cloth still exists in the try-on image; ii) Acquired-Occlusion: the target cloth warps to the unreasonable body part. Based on the in-depth analysis, we find that the occlusions can be simulated by a novel semantically-guided mixup module, which can generate semantic-specific occluded images that work together with the try-on images to facilitate training a de-occlusion try-on (DOC-VTON) framework. Specifically, DOC-VTON first conducts a sharpened semantic parsing on the try-on person. Aided by semantics guidance and pose prior, various complexities of texture are selectively blending with human parts in a copy-and-paste manner. Then, the Generative Module (GM) is utilized to take charge of synthesizing the final try-on image and learning to de-occlusion jointly. In comparison to the state-of-the-art methods, DOC-VTON achieves better perceptual quality by reducing occlusion effects.