感知视频质量评估（VQA）是许多流和视频共享平台的组成部分。在这里，我们以自我监督的方式考虑学习具有感知相关的视频质量表示的问题。失真类型的识别和降解水平确定被用作辅助任务，以训练一个深度学习模型，该模型包含深度卷积神经网络（CNN），该模型提取了空间特征，以及捕获时间信息的复发单元。该模型是使用对比度损失训练的，因此我们将此训练框架和结果模型称为对比度质量估计器（Conviqt）。在测试过程中，训练有素的模型的权重被冷冻，并且线性回归器将学习的功能映射到No-Reference（NR）设置中的质量得分。我们通过分析模型预测与地面真相质量评级之间的相关性，并与最先进的NR-VQA模型相比，我们对多个VQA数据库进行了全面评估，并实现竞争性能在这些数据库上进行了培训。我们的消融实验表明，学到的表示形式非常强大，并且在合成和现实的扭曲中很好地概括了。我们的结果表明，可以使用自我监督的学习来获得具有感知轴承的引人注目的表示。这项工作中使用的实现已在https://github.com/pavancm/conviqt上提供。

视频质量评估（VQA）仍然是一个重要而挑战性的问题，影响了最广泛的尺度的许多应用程序。移动设备和云计算技术的最新进展使得可以捕获，处理和共度高分辨率，高分辨率（HFR）视频几乎瞬间。能够监控和控制这些流式视频的质量可以使得能够提供更令人愉快的内容和感知的优化速率控制。因此，需要一种强迫需要开发可以在巨大尺度部署的VQA模型。虽然最近的一些效果已应用于可变帧速率和HFR视频质量的全参考（FR）分析，但是没有研究帧速率变化的无引用（NR）VQA算法的开发。在这里，我们提出了一种用于评估HFR视频的一级盲VQA模型，我们将其配给了帧群感知视频评估程序W / O参考（Faver）。 Faver使用扩展模型的空间自然场景统计数据，即包括节省空间小波分解的视频信号，进行有效的帧速率敏感质量预测。我们对几个HFR视频质量数据集的广泛实验表明，PEVER以合理的计算成本优于其他盲VQA算法。为了便于可重复的研究和公共评估，在线可以在线进行狂热的实施：\ url {https://github.com/uniqzheng/hfr-bvqa}。

在各种科学和临床环境中，快速无创探测空间变化的非相关事件（例如人类头骨下方的脑血流）是一项必不可少的任务。所使用的主要光学技术之一是弥漫性相关光谱（DC），其经典实现使用单个或几个单光子检测器，导致空间定位精度较差，时间分辨率相对较低。 Here, we propose a technique termed Classifying Rapid decorrelation Events via Parallelized single photon dEtection (CREPE)}, a new form of DCS that can probe and classify different decorrelating movements hidden underneath turbid volume with high sensitivity using parallelized speckle detection from a $32\times32 $像素SPAD阵列。我们通过对隐藏在5mm组织样的幻影下的不同时空 - 偏置模式进行分类来评估我们的设置，该模式由快速反相关的动态散射介质制成。十二个多模式纤维用于从组织幻影表面的不同位置收集散射光。为了验证我们的设置，我们通过在Multi-Kilo-Hertz速率下调制的数字微龙器设备（DMD）以及含有流动流体的容器幻影。除了具有胜过经典无监督学习方法的深层对比学习算法外，我们证明我们的方法可以准确地检测和分类浊度散射介质下的不同瞬态去相关事件（发生在0.1-0.4s中），而无需任何数据标记。这有可能应用于非侵入性的深层组织运动模式，例如在紧凑和静态检测探针内以多赫兹速率识别正常或异常的脑血流事件。

通过动态散射介质进行非侵入性光学成像具有许多重要的生物医学应用，但仍然是一项艰巨的任务。尽管标准弥漫成像方法测量光吸收或荧光发射，但也良好的是，散射的相干光的时间相关性通过组织像光强度一样扩散。然而，迄今为止，很少有作品旨在通过实验测量和处理这种时间相关数据，以证明去相关动力学的深度组织视频重建。在这项工作中，我们利用单光子雪崩二极管（SPAD）阵列摄像机同时监视单photon水平的斑点波动的时间动力学，从12种不同的幻影组织通过定制的纤维束阵列传递的位置。然后，我们应用深度神经网络将所获得的单光子测量值转换为迅速去摩擦组织幻像下散射动力学的视频。我们证明了重建瞬态（0.1-0.4s）动态事件的图像的能力，该动态事件发生在非相关的组织幻影下，并以毫米级分辨率进行重构，并突出显示我们的模型如何灵活地扩展到埋藏的phantom船只内的流速。

There are multiple scales of abstraction from which we can describe the same image, depending on whether we are focusing on fine-grained details or a more global attribute of the image. In brain mapping, learning to automatically parse images to build representations of both small-scale features (e.g., the presence of cells or blood vessels) and global properties of an image (e.g., which brain region the image comes from) is a crucial and open challenge. However, most existing datasets and benchmarks for neuroanatomy consider only a single downstream task at a time. To bridge this gap, we introduce a new dataset, annotations, and multiple downstream tasks that provide diverse ways to readout information about brain structure and architecture from the same image. Our multi-task neuroimaging benchmark (MTNeuro) is built on volumetric, micrometer-resolution X-ray microtomography images spanning a large thalamocortical section of mouse brain, encompassing multiple cortical and subcortical regions. We generated a number of different prediction challenges and evaluated several supervised and self-supervised models for brain-region prediction and pixel-level semantic segmentation of microstructures. Our experiments not only highlight the rich heterogeneity of this dataset, but also provide insights into how self-supervised approaches can be used to learn representations that capture multiple attributes of a single image and perform well on a variety of downstream tasks. Datasets, code, and pre-trained baseline models are provided at: https://mtneuro.github.io/ .

The purpose of this work was to tackle practical issues which arise when using a tendon-driven robotic manipulator with a long, passive, flexible proximal section in medical applications. A separable robot which overcomes difficulties in actuation and sterilization is introduced, in which the body containing the electronics is reusable and the remainder is disposable. A control input which resolves the redundancy in the kinematics and a physical interpretation of this redundancy are provided. The effect of a static change in the proximal section angle on bending angle error was explored under four testing conditions for a sinusoidal input. Bending angle error increased for increasing proximal section angle for all testing conditions with an average error reduction of 41.48% for retension, 4.28% for hysteresis, and 52.35% for re-tension + hysteresis compensation relative to the baseline case. Two major sources of error in tracking the bending angle were identified: time delay from hysteresis and DC offset from the proximal section angle. Examination of these error sources revealed that the simple hysteresis compensation was most effective for removing time delay and re-tension compensation for removing DC offset, which was the primary source of increasing error. The re-tension compensation was also tested for dynamic changes in the proximal section and reduced error in the final configuration of the tip by 89.14% relative to the baseline case.

Compliance in actuation has been exploited to generate highly dynamic maneuvers such as throwing that take advantage of the potential energy stored in joint springs. However, the energy storage and release could not be well-timed yet. On the contrary, for multi-link systems, the natural system dynamics might even work against the actual goal. With the introduction of variable stiffness actuators, this problem has been partially addressed. With a suitable optimal control strategy, the approximate decoupling of the motor from the link can be achieved to maximize the energy transfer into the distal link prior to launch. However, such continuous stiffness variation is complex and typically leads to oscillatory swing-up motions instead of clear launch sequences. To circumvent this issue, we investigate decoupling for speed maximization with a dedicated novel actuator concept denoted Bi-Stiffness Actuation. With this, it is possible to fully decouple the link from the joint mechanism by a switch-and-hold clutch and simultaneously keep the elastic energy stored. We show that with this novel paradigm, it is not only possible to reach the same optimal performance as with power-equivalent variable stiffness actuation, but even directly control the energy transfer timing. This is a major step forward compared to previous optimal control approaches, which rely on optimizing the full time-series control input.

The previous fine-grained datasets mainly focus on classification and are often captured in a controlled setup, with the camera focusing on the objects. We introduce the first Fine-Grained Vehicle Detection (FGVD) dataset in the wild, captured from a moving camera mounted on a car. It contains 5502 scene images with 210 unique fine-grained labels of multiple vehicle types organized in a three-level hierarchy. While previous classification datasets also include makes for different kinds of cars, the FGVD dataset introduces new class labels for categorizing two-wheelers, autorickshaws, and trucks. The FGVD dataset is challenging as it has vehicles in complex traffic scenarios with intra-class and inter-class variations in types, scale, pose, occlusion, and lighting conditions. The current object detectors like yolov5 and faster RCNN perform poorly on our dataset due to a lack of hierarchical modeling. Along with providing baseline results for existing object detectors on FGVD Dataset, we also present the results of a combination of an existing detector and the recent Hierarchical Residual Network (HRN) classifier for the FGVD task. Finally, we show that FGVD vehicle images are the most challenging to classify among the fine-grained datasets.

The task of reconstructing 3D human motion has wideranging applications. The gold standard Motion capture (MoCap) systems are accurate but inaccessible to the general public due to their cost, hardware and space constraints. In contrast, monocular human mesh recovery (HMR) methods are much more accessible than MoCap as they take single-view videos as inputs. Replacing the multi-view Mo- Cap systems with a monocular HMR method would break the current barriers to collecting accurate 3D motion thus making exciting applications like motion analysis and motiondriven animation accessible to the general public. However, performance of existing HMR methods degrade when the video contains challenging and dynamic motion that is not in existing MoCap datasets used for training. This reduces its appeal as dynamic motion is frequently the target in 3D motion recovery in the aforementioned applications. Our study aims to bridge the gap between monocular HMR and multi-view MoCap systems by leveraging information shared across multiple video instances of the same action. We introduce the Neural Motion (NeMo) field. It is optimized to represent the underlying 3D motions across a set of videos of the same action. Empirically, we show that NeMo can recover 3D motion in sports using videos from the Penn Action dataset, where NeMo outperforms existing HMR methods in terms of 2D keypoint detection. To further validate NeMo using 3D metrics, we collected a small MoCap dataset mimicking actions in Penn Action,and show that NeMo achieves better 3D reconstruction compared to various baselines.

Rigorous guarantees about the performance of predictive algorithms are necessary in order to ensure their responsible use. Previous work has largely focused on bounding the expected loss of a predictor, but this is not sufficient in many risk-sensitive applications where the distribution of errors is important. In this work, we propose a flexible framework to produce a family of bounds on quantiles of the loss distribution incurred by a predictor. Our method takes advantage of the order statistics of the observed loss values rather than relying on the sample mean alone. We show that a quantile is an informative way of quantifying predictive performance, and that our framework applies to a variety of quantile-based metrics, each targeting important subsets of the data distribution. We analyze the theoretical properties of our proposed method and demonstrate its ability to rigorously control loss quantiles on several real-world datasets.