In contrast to fully supervised methods using pixel-wise mask labels, box-supervised instance segmentation takes advantage of simple box annotations, which has recently attracted increasing research attention. This paper presents a novel single-shot instance segmentation approach, namely Box2Mask, which integrates the classical level-set evolution model into deep neural network learning to achieve accurate mask prediction with only bounding box supervision. Specifically, both the input image and its deep features are employed to evolve the level-set curves implicitly, and a local consistency module based on a pixel affinity kernel is used to mine the local context and spatial relations. Two types of single-stage frameworks, i.e., CNN-based and transformer-based frameworks, are developed to empower the level-set evolution for box-supervised instance segmentation, and each framework consists of three essential components: instance-aware decoder, box-level matching assignment and level-set evolution. By minimizing the level-set energy function, the mask map of each instance can be iteratively optimized within its bounding box annotation. The experimental results on five challenging testbeds, covering general scenes, remote sensing, medical and scene text images, demonstrate the outstanding performance of our proposed Box2Mask approach for box-supervised instance segmentation. In particular, with the Swin-Transformer large backbone, our Box2Mask obtains 42.4% mask AP on COCO, which is on par with the recently developed fully mask-supervised methods. The code is available at: https://github.com/LiWentomng/boxlevelset.
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Automated identification of myocardial scar from late gadolinium enhancement cardiac magnetic resonance images (LGE-CMR) is limited by image noise and artifacts such as those related to motion and partial volume effect. This paper presents a novel joint deep learning (JDL) framework that improves such tasks by utilizing simultaneously learned myocardium segmentations to eliminate negative effects from non-region-of-interest areas. In contrast to previous approaches treating scar detection and myocardium segmentation as separate or parallel tasks, our proposed method introduces a message passing module where the information of myocardium segmentation is directly passed to guide scar detectors. This newly designed network will efficiently exploit joint information from the two related tasks and use all available sources of myocardium segmentation to benefit scar identification. We demonstrate the effectiveness of JDL on LGE-CMR images for automated left ventricular (LV) scar detection, with great potential to improve risk prediction in patients with both ischemic and non-ischemic heart disease and to improve response rates to cardiac resynchronization therapy (CRT) for heart failure patients. Experimental results show that our proposed approach outperforms multiple state-of-the-art methods, including commonly used two-step segmentation-classification networks, and multitask learning schemes where subtasks are indirectly interacted.
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The selection of an optimal pacing site, which is ideally scar-free and late activated, is critical to the response of cardiac resynchronization therapy (CRT). Despite the success of current approaches formulating the detection of such late mechanical activation (LMA) regions as a problem of activation time regression, their accuracy remains unsatisfactory, particularly in cases where myocardial scar exists. To address this issue, this paper introduces a multi-task deep learning framework that simultaneously estimates LMA amount and classify the scar-free LMA regions based on cine displacement encoding with stimulated echoes (DENSE) magnetic resonance imaging (MRI). With a newly introduced auxiliary LMA region classification sub-network, our proposed model shows more robustness to the complex pattern cause by myocardial scar, significantly eliminates their negative effects in LMA detection, and in turn improves the performance of scar classification. To evaluate the effectiveness of our method, we tests our model on real cardiac MR images and compare the predicted LMA with the state-of-the-art approaches. It shows that our approach achieves substantially increased accuracy. In addition, we employ the gradient-weighted class activation mapping (Grad-CAM) to visualize the feature maps learned by all methods. Experimental results suggest that our proposed model better recognizes the LMA region pattern.
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与使用像素面罩标签的完全监督的方法相反,盒子监督实例细分利用了简单的盒子注释,该盒子注释最近吸引了许多研究注意力。在本文中,我们提出了一种新颖的单弹盒监督实例分割方法,该方法将经典级别设置模型与深度神经网络精致整合在一起。具体而言,我们提出的方法迭代地通过端到端的方式通过基于Chan-Vese的连续能量功能来学习一系列级别集。一个简单的掩码监督的SOLOV2模型可供选择,以预测实例感知的掩码映射为每个实例的级别设置。输入图像及其深度特征都被用作输入数据来发展级别集曲线,其中使用框投影函数来获得初始边界。通过最大程度地减少完全可分化的能量函数,在其相应的边界框注释中迭代优化了每个实例的级别设置。在四个具有挑战性的基准上的实验结果表明,在各种情况下,我们提出的强大实例分割方法的领先表现。该代码可在以下网址获得:https://github.com/liwentomng/boxlevelset。
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利用Stylegan的表现力及其分离的潜在代码,现有方法可以实现对不同视觉属性的现实编辑,例如年龄和面部图像的性别。出现了一个有趣而又具有挑战性的问题:生成模型能否针对他们博学的先验进行反事实编辑?由于自然数据集中缺乏反事实样本,我们以文本驱动的方式研究了这个问题,并具有对比语言图像预言(剪辑),这些(剪辑)甚至可以为各种反事实概念提供丰富的语义知识。与内域操作不同,反事实操作需要更全面地剥削夹包含的语义知识,以及对编辑方向的更微妙的处理,以避免被卡在局部最低或不需要的编辑中。为此,我们设计了一种新颖的对比损失,该损失利用了预定义的夹子空间方向,从不同的角度将编辑指向所需的方向。此外,我们设计了一个简单而有效的方案,该方案将(目标文本)明确映射到潜在空间,并将其与潜在代码融合在一起,以进行有效的潜在代码优化和准确的编辑。广泛的实验表明,我们的设计在乘坐各种反事实概念的目标文本驾驶时,可以实现准确,现实的编辑。
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关于驾驶场景图像的语义细分对于自动驾驶至关重要。尽管在白天图像上已经实现了令人鼓舞的性能,但由于暴露不足和缺乏标记的数据,夜间图像的性能不那么令人满意。为了解决这些问题,我们提出了一个称为双图像自动学习过滤器(拨号过滤器)的附加模块,以改善夜间驾驶条件下的语义分割,旨在利用不同照明下驾驶场景图像的内在特征。拨盘滤波器由两个部分组成,包括图像自适应处理模块(IAPM)和可学习的引导过滤器(LGF)。使用拨号过滤器,我们设计了无监督和有监督的框架,用于夜间驾驶场景细分,可以以端到端的方式进行培训。具体而言,IAPM模块由一个带有一组可区分图像过滤器的小型卷积神经网络组成,可以自适应地增强每个图像,以更好地相对于不同的照明。 LGF用于增强分割网络的输出以获得最终的分割结果。拨号过滤器轻巧有效,可以在白天和夜间图像中轻松应用它们。我们的实验表明,Dail过滤器可以显着改善ACDC_Night和Nightcity数据集的监督细分性能,而它展示了有关无监督的夜间夜间语义细分的最新性能,在黑暗的苏黎世和夜间驾驶测试床上。
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结肠直肠癌(CRC)是世界上最常见的致命癌症之一。果切除术可以有效地中断腺瘤的进展到腺癌,从而降低了CRC发育的风险。结肠镜检查是找到结肠息肉的主要方法。然而,由于息肉的不同尺寸和息肉和周围的粘膜之间的阴影不明确,因此精确地对分段息肉挑战。为了解决这个问题,我们设计了一个用于精确的息肉分割的边界分布引导网络(BDG-Net)。具体地,在理想边界分布图(BDM)的监督下,我们使用边界分布生成模块(BDGM)来聚合高级功能并生成BDM。然后,BDM被发送到边界分布引导解码器(BDGD)作为互补空间信息以引导息肉分割。此外,BDGD采用了多尺度特征交互策略,以提高不同尺寸的息肉的分割精度。广泛的定量和定性评估展示了我们模型的有效性,这在五个公共息肉数据集上显着优于最先进的模型,同时保持低计算复杂性。
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基于注册的Atlas Building经常在高维图像空间中造成计算挑战。在本文中,我们介绍了一种新的混合地图集建筑算法,该算法快速估计来自大规模图像数据集的图表,计算成本大大降低。与先前的方法相比,迭代地在估计的地图集和单个图像之间执行注册任务,我们建议使用从预先训练的神经网络的登记的学习前沿。这种新开发的混合框架具有(i)提供了一种有效的Atlas建筑工程,而不会失去结果的质量,以及(ii)在利用各种深度学习的注册方法提供灵活性。我们展示了这一提出模型对3D脑磁共振成像(MRI)扫描的有效性。
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自动化车辆功能最佳接受和舒适性的关键因素是驾驶方式。自动化和驱动程序偏爱的驾驶方式之间的不匹配可以使用户更频繁地接管甚至禁用自动化功能。这项工作建议用多模式信号识别用户驾驶样式偏好,因此该车辆可以以连续自动的方式匹配用户偏好。我们对36名参与者进行了驾驶模拟器研究,并收集了广泛的多模式数据,包括行为,生理和情境数据。这包括眼目光,转向抓地力,驾驶演习,制动和节气门踏板输入以及距踏板的脚距离,瞳孔直径,电流皮肤反应,心率和情境驱动驱动环境。然后,我们建立了机器学习模型来识别首选的驾驶方式,并确认所有模式对于识别用户偏好都很重要。这项工作为自动车辆的隐性自适应驾驶风格铺平了道路。
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在本文中,我们介绍了计算机视觉研讨会上的女性 - WICV 2022,与路易斯安那州新奥尔良的混合CVPR 2022一起组织。它为计算机视觉社区中的少数(女性)群体提供了声音,并着重于提高这些研究人员在学术界和工业中的可见性。 WICV认为,这样的事件可以在降低计算机视觉领域的性别失衡方面发挥重要作用。 WICV每年都会组织a)a)从少数群体的研究人员之间合作的机会,b)指导女性初级研究人员,c)向演示者提供财政支持,以克服货币负担,D)榜样的大量选择,他们可以在职业生涯开始时,是年轻研究人员的例子。在本文中,我们介绍了有关研讨会计划的报告,过去几年的趋势,关于WICV 2022讲习班的演示者,与会者和赞助的统计摘要。
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