Most existing scene text detectors require large-scale training data which cannot scale well due to two major factors: 1) scene text images often have domain-specific distributions; 2) collecting large-scale annotated scene text images is laborious. We study domain adaptive scene text detection, a largely neglected yet very meaningful task that aims for optimal transfer of labelled scene text images while handling unlabelled images in various new domains. Specifically, we design SCAST, a subcategory-aware self-training technique that mitigates the network overfitting and noisy pseudo labels in domain adaptive scene text detection effectively. SCAST consists of two novel designs. For labelled source data, it introduces pseudo subcategories for both foreground texts and background stuff which helps train more generalizable source models with multi-class detection objectives. For unlabelled target data, it mitigates the network overfitting by co-regularizing the binary and subcategory classifiers trained in the source domain. Extensive experiments show that SCAST achieves superior detection performance consistently across multiple public benchmarks, and it also generalizes well to other domain adaptive detection tasks such as vehicle detection.

多尺度功能已被证明在对象检测方面非常有效，大多数基于Convnet的对象检测器采用特征金字塔网络（FPN）作为利用多尺度功能的基本组件。但是，对于最近提出的基于变压器的对象探测器，直接结合多尺度功能会导致由于处理高分辨率特征的注意机制的高复杂性，因此导致了高度的计算开销。本文介绍了迭代多尺度特征聚合（IMFA） - 一种通用范式，可有效利用基于变压器的对象检测器中的多尺度特征。核心想法是从仅几个关键位置利用稀疏的多尺度特征，并且通过两种新颖的设计实现了稀疏的特征。首先，IMFA重新安排变压器编码器数据管道，因此可以根据检测预测进行迭代更新编码的功能。其次，在先前检测预测的指导下，IMFA稀疏的量表自适应特征可从几个关键点位置进行精制检测。结果，采样的多尺度特征稀疏，但仍然对对象检测非常有益。广泛的实验表明，提出的IMFA在略有计算开销的情况下显着提高了基于变压器的对象检测器的性能。项目页面：https：//github.com/zhanggongjie/imfa。

给定部分微分方程（PDE），面向目标的误差估计使我们能够了解诊断数量的兴趣数量（QOI）或目标的错误如何发生并积累在数值近似中，例如使用有限元方法。通过将误差估计分解为来自各个元素的贡献，可以制定适应方法，该方法可以修改网格，以最大程度地减少所得QOI误差的目的。但是，标准误差估计公式涉及真实的伴随解决方案，这在实践中是未知的。因此，通常的做法是用“富集”的近似值（例如，在更高的空间或精制的网格上）近似。这样做通常会导致计算成本的显着增加，这可能是损害（面向目标）自适应模拟的竞争力的瓶颈。本文的核心思想是通过选择性更换昂贵的误差估计步骤，并使用适当的配置和训练的神经网络开发“数据驱动”目标的网格适应方法。这样，甚至可以在不构造富集空间的情况下获得误差估计器。此处采用了逐元构造，该元素构造与网格几何相关的各种参数的局部值和基础问题物理物理作为输入，并且对误差估计器的相应贡献作为输出。我们证明，这种方法能够以降低的计算成本获得相同的准确性，对于与潮汐涡轮机周围流动相关的自适应网格测试用例，这些测试用例是通过其下游唤醒相互作用的，以及农场的整体功率输出作为将其视为QOI。此外，我们证明了元素元素方法意味着培训成本相当低。

域自适应综合分段旨在通过利用一个或多个相关源域中的现成注释数据来减轻数据注释挑战。但是，现有研究采用两个网络，例如分割和语义分割，从而导致大量网络参数具有复杂和计算强化的培训和推理过程。我们设计了UnIdaps，这是一个统一的自适应泛型分割网络，它很简单，但能够在单个网络中同时实现域自适应实例分割和语义分割。 UNIDAPS引入了层次掩码校准（HMC），该层面校准校正了预测的伪掩模，伪超像素和伪像素，并通过即时的在线自我训练过程进行网络重新训练。它具有三个唯一的功能：1）它可以启用统一的域自适应全景适应； 2）它可以缓解虚假预测并有效地改善域的自适应圆形分割； 3）它是端到端的训练，具有较少的参数，更简单的培训和推理管道。对多个公共基准测试的广泛实验表明，与最先进的艺术品相比，UNIDAPS可以实现优越的域自适应泛型分割。

Blind image quality assessment (BIQA) remains challenging due to the diversity of distortion and image content variation, which complicate the distortion patterns crossing different scales and aggravate the difficulty of the regression problem for BIQA. However, existing BIQA methods often fail to consider multi-scale distortion patterns and image content, and little research has been done on learning strategies to make the regression model produce better performance. In this paper, we propose a simple yet effective Progressive Multi-Task Image Quality Assessment (PMT-IQA) model, which contains a multi-scale feature extraction module (MS) and a progressive multi-task learning module (PMT), to help the model learn complex distortion patterns and better optimize the regression issue to align with the law of human learning process from easy to hard. To verify the effectiveness of the proposed PMT-IQA model, we conduct experiments on four widely used public datasets, and the experimental results indicate that the performance of PMT-IQA is superior to the comparison approaches, and both MS and PMT modules improve the model's performance.

In the scenario of black-box adversarial attack, the target model's parameters are unknown, and the attacker aims to find a successful adversarial perturbation based on query feedback under a query budget. Due to the limited feedback information, existing query-based black-box attack methods often require many queries for attacking each benign example. To reduce query cost, we propose to utilize the feedback information across historical attacks, dubbed example-level adversarial transferability. Specifically, by treating the attack on each benign example as one task, we develop a meta-learning framework by training a meta-generator to produce perturbations conditioned on benign examples. When attacking a new benign example, the meta generator can be quickly fine-tuned based on the feedback information of the new task as well as a few historical attacks to produce effective perturbations. Moreover, since the meta-train procedure consumes many queries to learn a generalizable generator, we utilize model-level adversarial transferability to train the meta-generator on a white-box surrogate model, then transfer it to help the attack against the target model. The proposed framework with the two types of adversarial transferability can be naturally combined with any off-the-shelf query-based attack methods to boost their performance, which is verified by extensive experiments.

Human modeling and relighting are two fundamental problems in computer vision and graphics, where high-quality datasets can largely facilitate related research. However, most existing human datasets only provide multi-view human images captured under the same illumination. Although valuable for modeling tasks, they are not readily used in relighting problems. To promote research in both fields, in this paper, we present UltraStage, a new 3D human dataset that contains more than 2K high-quality human assets captured under both multi-view and multi-illumination settings. Specifically, for each example, we provide 32 surrounding views illuminated with one white light and two gradient illuminations. In addition to regular multi-view images, gradient illuminations help recover detailed surface normal and spatially-varying material maps, enabling various relighting applications. Inspired by recent advances in neural representation, we further interpret each example into a neural human asset which allows novel view synthesis under arbitrary lighting conditions. We show our neural human assets can achieve extremely high capture performance and are capable of representing fine details such as facial wrinkles and cloth folds. We also validate UltraStage in single image relighting tasks, training neural networks with virtual relighted data from neural assets and demonstrating realistic rendering improvements over prior arts. UltraStage will be publicly available to the community to stimulate significant future developments in various human modeling and rendering tasks.

Humans constantly interact with objects in daily life tasks. Capturing such processes and subsequently conducting visual inferences from a fixed viewpoint suffers from occlusions, shape and texture ambiguities, motions, etc. To mitigate the problem, it is essential to build a training dataset that captures free-viewpoint interactions. We construct a dense multi-view dome to acquire a complex human object interaction dataset, named HODome, that consists of $\sim$75M frames on 10 subjects interacting with 23 objects. To process the HODome dataset, we develop NeuralDome, a layer-wise neural processing pipeline tailored for multi-view video inputs to conduct accurate tracking, geometry reconstruction and free-view rendering, for both human subjects and objects. Extensive experiments on the HODome dataset demonstrate the effectiveness of NeuralDome on a variety of inference, modeling, and rendering tasks. Both the dataset and the NeuralDome tools will be disseminated to the community for further development.

We study a challenging task, conditional human motion generation, which produces plausible human motion sequences according to various conditional inputs, such as action classes or textual descriptors. Since human motions are highly diverse and have a property of quite different distribution from conditional modalities, such as textual descriptors in natural languages, it is hard to learn a probabilistic mapping from the desired conditional modality to the human motion sequences. Besides, the raw motion data from the motion capture system might be redundant in sequences and contain noises; directly modeling the joint distribution over the raw motion sequences and conditional modalities would need a heavy computational overhead and might result in artifacts introduced by the captured noises. To learn a better representation of the various human motion sequences, we first design a powerful Variational AutoEncoder (VAE) and arrive at a representative and low-dimensional latent code for a human motion sequence. Then, instead of using a diffusion model to establish the connections between the raw motion sequences and the conditional inputs, we perform a diffusion process on the motion latent space. Our proposed Motion Latent-based Diffusion model (MLD) could produce vivid motion sequences conforming to the given conditional inputs and substantially reduce the computational overhead in both the training and inference stages. Extensive experiments on various human motion generation tasks demonstrate that our MLD achieves significant improvements over the state-of-the-art methods among extensive human motion generation tasks, with two orders of magnitude faster than previous diffusion models on raw motion sequences.

Depth estimation is usually ill-posed and ambiguous for monocular camera-based 3D multi-person pose estimation. Since LiDAR can capture accurate depth information in long-range scenes, it can benefit both the global localization of individuals and the 3D pose estimation by providing rich geometry features. Motivated by this, we propose a monocular camera and single LiDAR-based method for 3D multi-person pose estimation in large-scale scenes, which is easy to deploy and insensitive to light. Specifically, we design an effective fusion strategy to take advantage of multi-modal input data, including images and point cloud, and make full use of temporal information to guide the network to learn natural and coherent human motions. Without relying on any 3D pose annotations, our method exploits the inherent geometry constraints of point cloud for self-supervision and utilizes 2D keypoints on images for weak supervision. Extensive experiments on public datasets and our newly collected dataset demonstrate the superiority and generalization capability of our proposed method.