Three-dimensional (3D) ultrasound imaging technique has been applied for scoliosis assessment, but current assessment method only uses coronal projection image and cannot illustrate the 3D deformity and vertebra rotation. The vertebra detection is essential to reveal 3D spine information, but the detection task is challenging due to complex data and limited annotations. We propose VertMatch, a two-step framework to detect vertebral structures in 3D ultrasound volume by utilizing unlabeled data in semi-supervised manner. The first step is to detect the possible positions of structures on transverse slice globally, and then the local patches are cropped based on detected positions. The second step is to distinguish whether the patches contain real vertebral structures and screen the predicted positions from the first step. VertMatch develops three novel components for semi-supervised learning: for position detection in the first step, (1) anatomical prior is used to screen pseudo labels generated from confidence threshold method; (2) multi-slice consistency is used to utilize more unlabeled data by inputting multiple adjacent slices; (3) for patch identification in the second step, the categories are rebalanced in each batch to solve imbalance problem. Experimental results demonstrate that VertMatch can detect vertebra accurately in ultrasound volume and outperforms state-of-the-art methods. VertMatch is also validated in clinical application on forty ultrasound scans, and it can be a promising approach for 3D assessment of scoliosis.

To reproduce the success of text-to-image (T2I) generation, recent works in text-to-video (T2V) generation employ large-scale text-video dataset for fine-tuning. However, such paradigm is computationally expensive. Humans have the amazing ability to learn new visual concepts from just one single exemplar. We hereby study a new T2V generation problem$\unicode{x2014}$One-Shot Video Generation, where only a single text-video pair is presented for training an open-domain T2V generator. Intuitively, we propose to adapt the T2I diffusion model pretrained on massive image data for T2V generation. We make two key observations: 1) T2I models are able to generate images that align well with the verb terms; 2) extending T2I models to generate multiple images concurrently exhibits surprisingly good content consistency. To further learn continuous motion, we propose Tune-A-Video with a tailored Sparse-Causal Attention, which generates videos from text prompts via an efficient one-shot tuning of pretrained T2I diffusion models. Tune-A-Video is capable of producing temporally-coherent videos over various applications such as change of subject or background, attribute editing, style transfer, demonstrating the versatility and effectiveness of our method.

The success of deep learning heavily relies on large-scale data with comprehensive labels, which is more expensive and time-consuming to fetch in 3D compared to 2D images or natural languages. This promotes the potential of utilizing models pretrained with data more than 3D as teachers for cross-modal knowledge transferring. In this paper, we revisit masked modeling in a unified fashion of knowledge distillation, and we show that foundational Transformers pretrained with 2D images or natural languages can help self-supervised 3D representation learning through training Autoencoders as Cross-Modal Teachers (ACT). The pretrained Transformers are transferred as cross-modal 3D teachers using discrete variational autoencoding self-supervision, during which the Transformers are frozen with prompt tuning for better knowledge inheritance. The latent features encoded by the 3D teachers are used as the target of masked point modeling, wherein the dark knowledge is distilled to the 3D Transformer students as foundational geometry understanding. Our ACT pretrained 3D learner achieves state-of-the-art generalization capacity across various downstream benchmarks, e.g., 88.21% overall accuracy on ScanObjectNN. Codes will be released at https://github.com/RunpeiDong/ACT.

Vector-Quantized (VQ-based) generative models usually consist of two basic components, i.e., VQ tokenizers and generative transformers. Prior research focuses on improving the reconstruction fidelity of VQ tokenizers but rarely examines how the improvement in reconstruction affects the generation ability of generative transformers. In this paper, we surprisingly find that improving the reconstruction fidelity of VQ tokenizers does not necessarily improve the generation. Instead, learning to compress semantic features within VQ tokenizers significantly improves generative transformers' ability to capture textures and structures. We thus highlight two competing objectives of VQ tokenizers for image synthesis: semantic compression and details preservation. Different from previous work that only pursues better details preservation, we propose Semantic-Quantized GAN (SeQ-GAN) with two learning phases to balance the two objectives. In the first phase, we propose a semantic-enhanced perceptual loss for better semantic compression. In the second phase, we fix the encoder and codebook, but enhance and finetune the decoder to achieve better details preservation. The proposed SeQ-GAN greatly improves VQ-based generative models and surpasses the GAN and Diffusion Models on both unconditional and conditional image generation. Our SeQ-GAN (364M) achieves Frechet Inception Distance (FID) of 6.25 and Inception Score (IS) of 140.9 on 256x256 ImageNet generation, a remarkable improvement over VIT-VQGAN (714M), which obtains 11.2 FID and 97.2 IS.

视频和文本之间的跨模式检索因网络上的视频迅速出现而越来越多。通常，视频包含丰富的实例和事件信息，查询文本仅描述了信息的一部分。因此，视频可以对应于多个不同的文本说明和查询。我们将此现象称为``视频文本对应歧义''问题。当前技术主要集中于挖掘视频和文本内容之间的本地或多级对齐（\ textit {e.g。}，对实体和动词的动作对象）。这些方法很难通过仅使用一个单个功能来描述视频来减轻视频文本的歧义，这需要同时与多个不同的文本功能匹配。为了解决这个问题，我们提出了一个文本自适应多个视觉原型匹配模型，该模型会自动捕获多个原型，以通过自适应聚合视频令牌功能来描述视频。给定查询文本，相似性由最相似的原型确定，以在视频中找到对应关系，该视频称为文本自适应匹配。为了学习代表视频中丰富信息的多种原型，我们提出了差异损失，以鼓励不同的原型参与视频的不同内容。我们的方法在四个公共视频检索数据集上优于最先进的方法。

在深度感知的固有歧义的范围内，现代相机的3D对象检测方法属于性能瓶颈。从直觉上讲，利用时间多视角立体声（MVS）技术是解决这种歧义的自然知识。但是，在适用于3D对象检测场景时，MV的传统尝试在两个方面存在缺陷：1）所有观点之间的亲和力测量遭受昂贵的计算成本； 2）很难处理经常移动物体的室外场景。为此，我们引入了一种有效的时间立体声方法，以动态选择匹配候选者的尺度，从而显着减少计算开销。更进一步，我们设计了一种迭代算法，以更新更有价值的候选人，使其适应移动候选人。我们将我们提出的方法实例化，以进行多视图3D检测器，即Bevstereo。 Bevstereo在Nuscenes数据集的仅相机轨道上实现了新的最先进的性能（即52.5％地图和61.0％NDS）。同时，广泛的实验反映了我们的方法比当代MVS方法更好地处理复杂的室外场景。代码已在https://github.com/megvii astection/bevstereo上发布。

在公共危机时期，寻求信息对于人们的自我保健和福祉至关重要。广泛的研究调查了经验理解和技术解决方案，以促进受影响地区的家庭公民寻求信息。但是，建立有限的知识是为了支持需要在其东道国发生危机的国际移民。当前的论文对居住在日本和美国（n = 14）的两名中国移民（n = 14）进行了访谈研究。参与者反思了他们在共同大流行期间寻求经验的信息。反思补充了两周的自我追踪，参与者保持了相关信息寻求实践的记录。我们的数据表明，参与者经常绕开语言绕道，或访问普通话资源以获取有关其东道国疫情爆发的信息。他们还进行了战略性利用普通话信息，以进行选择性阅读，交叉检查以及对日语或英语的共同信息的上下文化解释。尽管这种做法增强了参与者对共同相关信息收集和感官的有效性，但他们有时会通过有时认识的方式使人们处于不利地位。此外，参与者缺乏对审查以移民为导向的信息的认识或偏爱，尽管该信息可用，这些信息是由东道国公共当局发布的。在这些发现的基础上，我们讨论了改善国际移民在非本地语言和文化环境中寻求共同相关信息的解决方案。我们主张包容性危机基础设施，这些基础设施将吸引以当地语言流利程度，信息素养和利用公共服务的经验的不同水平的人们。

学习准确的深度对于多视图3D对象检测至关重要。最近的方法主要是从单眼图像中学习深度，由于单眼深度学习的性质不足，这会面临固有的困难。在这项工作中，我们提出了一种新颖的环绕时间立体声（STS）技术，而不是使用唯一的单眼深度方法，而是利用跨时间之间的几何对应关系来促进准确的深度学习。具体而言，我们将自我车辆周围所有相机的视野视为统一的视图，即环绕浏览量，并在其上进行暂时立体声匹配。利用与STS不同框架之间的几何对应关系并与单眼深度结合在一起，以产生最终的深度预测。关于Nuscenes的综合实验表明，STS极大地提高了3D检测能力，特别是对于中距离和长距离对象。在带有RESNET-50骨架的BEVDEPTH上，STS分别提高了MAP和NDS，分别提高了2.6％和1.4％。当使用较大的主链和较大的图像分辨率时，观察到一致的改进，证明了其有效性

目前，在鸟眼中检测3D对象（BEV）优于其他3D检测器，用于自动驾驶和机器人技术。但是，将图像特征转换为BEV需要特别操作员进行特征采样。这些操作员在许多边缘设备上不受支持，在部署探测器时会带来额外的障碍。为了解决此问题，我们重新审视BEV表示的生成，并在透视图BEV中提出检测对象 - 一种不需要功能采样的新的BEV表示。我们证明，BEV功能同样可以享受BEV范式的好处。此外，视角BEV通过解决特征采样引起的问题来改善检测性能。我们建议基于此发现的透视bev空间中的高性能对象检测提出PERSDET。在实施简单且有效的结构时，SPEDET优于Nuscenes基准上的现有最新单眼方法，在使用Resnet-50作为骨架时，达到34.6％的MAP和40.8％的NDS。

对接系统对于在线多人游戏中创建公平匹配至关重要，这直接影响玩家的满足感和游戏体验。大多数对接系统在很大程度上取决于对玩家游戏技能的精确估计来构建公平的游戏。但是，新手的技能等级通常是不准确的，因为当前的对接评级算法需要大量游戏才能学习新玩家的真正技能。在早期阶段使用这些不可靠的技能得分通常会导致团队绩效方面的差异，这会导致负面的游戏体验。这被称为对接评级算法的“冷启动”问题。为了克服这个难题，本文提出了QuickSkill，这是一个基于深度学习的新手技能估算框架，以快速探究在线多人游戏中新玩家的能力。 QuickSkill提取了玩家最初的几款游戏中的顺序性能功能，以通过专用的神经网络来预测他/她的未来技能评级，从而在玩家的早期游戏阶段进行准确的技能估计。通过使用Quickskill进行对接，可以在最初的冷门时期大大改善游戏公平性。我们在离线和在线场景中都在流行的移动多人游戏中进行实验。使用两个现实世界中的匿名游戏数据集获得的结果表明，提议的QuickSkill提供了对新手游戏技能的精确估计，从而导致团队技能差异明显降低和更好的玩家游戏体验。据我们所知，提议的Quickskill是第一个解决传统技能评级算法的冷门问题的框架。