Near infrared (NIR) to Visible (VIS) face matching is challenging due to the significant domain gaps as well as a lack of sufficient data for cross-modality model training. To overcome this problem, we propose a novel method for paired NIR-VIS facial image generation. Specifically, we reconstruct 3D face shape and reflectance from a large 2D facial dataset and introduce a novel method of transforming the VIS reflectance to NIR reflectance. We then use a physically-based renderer to generate a vast, high-resolution and photorealistic dataset consisting of various poses and identities in the NIR and VIS spectra. Moreover, to facilitate the identity feature learning, we propose an IDentity-based Maximum Mean Discrepancy (ID-MMD) loss, which not only reduces the modality gap between NIR and VIS images at the domain level but encourages the network to focus on the identity features instead of facial details, such as poses and accessories. Extensive experiments conducted on four challenging NIR-VIS face recognition benchmarks demonstrate that the proposed method can achieve comparable performance with the state-of-the-art (SOTA) methods without requiring any existing NIR-VIS face recognition datasets. With slightly fine-tuning on the target NIR-VIS face recognition datasets, our method can significantly surpass the SOTA performance. Code and pretrained models are released under the insightface (https://github.com/deepinsight/insightface/tree/master/recognition).
translated by 谷歌翻译
由于其广泛的应用,例如自动驾驶,机器人技术等,认识到Point Cloud视频的人类行为引起了学术界和行业的极大关注。但是,当前的点云动作识别方法通常需要大量的数据,其中具有手动注释和具有较高计算成本的复杂骨干网络,这使得对现实世界应用程序不切实际。因此,本文考虑了半监督点云动作识别的任务。我们提出了一个蒙版的伪标记自动编码器(\ textbf {Maple})框架,以学习有效表示,以较少的注释以供点云动作识别。特别是,我们设计了一个新颖有效的\ textbf {de}耦合\ textbf {s} patial- \ textbf {t} emporal trans \ textbf {pert}(\ textbf {destbrof {destformer})作为maple的backbone。在Destformer中,4D点云视频的空间和时间维度被脱钩,以实现有效的自我注意,以学习长期和短期特征。此外,要从更少的注释中学习判别功能,我们设计了一个蒙版的伪标记自动编码器结构,以指导Destformer从可用框架中重建蒙面帧的功能。更重要的是,对于未标记的数据,我们从分类头中利用伪标签作为从蒙版框架重建功能的监督信号。最后,全面的实验表明,枫树在三个公共基准上取得了优异的结果,并且在MSR-ACTION3D数据集上以8.08 \%的精度优于最先进的方法。
translated by 谷歌翻译
Video-Text检索(VTR)是多模式理解的一项有吸引力但具有挑战性的任务,该任务旨在在给定查询(视频)的情况下搜索相关的视频(文本)。现有方法通常采用完全异构的视觉文本信息来对齐视频和文本,同时缺乏对这两种模式中均匀的高级语义信息的认识。为了填补这一差距,在这项工作中,我们提出了一个新颖的视觉语言对准模型,名为VTR Hise,该模型通过合并显式高级语义来改善跨模式的表示。首先,我们探讨了显式高级语义的层次结构属性,并将其进一步分为两个级别,即离散的语义和整体语义。具体来说,对于视觉分支,我们利用了现成的语义实体预测器来生成离散的高级语义。同时,采用训练有素的视频字幕模型来输出整体高级语义。至于文本方式,我们将文本分为三个部分,包括发生,动作和实体。特别是,这种情况对应于整体高级语义,同时动作和实体代表离散的语义。然后,利用不同的图推理技术来促进整体和离散的高级语义之间的相互作用。广泛的实验表明,借助明确的高级语义,我们的方法在包括MSR-VTT,MSVD和DIDEMO在内的三个基准数据集上实现了优于最先进方法的卓越性能。
translated by 谷歌翻译
有效的视频识别是一个热点研究主题,具有互联网和移动设备上多媒体数据的爆炸性增长。大多数现有方法都选择了显着帧,而不意识对特定于类的显着性分数,这忽略了框架显着性及其归属类别之间的隐式关联。为了减轻此问题,我们设计了一种新颖的时间显着性查询(TSQ)机制,该机制引入了特定于类的信息,以提供明显测量的细粒线索。具体而言,我们将特定于类的显着性测量过程建模为查询响应任务。对于每个类别,它的共同模式被用作查询,最突出的框架对其进行了响应。然后,计算出的相似性被用作框架显着性得分。为了实现这一目标,我们提出了一个时间显着性查询网络(TSQNET),其中包括基于视觉外观相似性和文本事件对象关系的TSQ机制的两个实例化。之后,实施了交叉模式相互作用以促进它们之间的信息交换。最后,我们使用了两种模式生成的最自信类别的特定阶级销售,以执行显着框架的选择。广泛的实验通过在ActivityNet,FCVID和Mini-Kinetics数据集上实现最新结果来证明我们方法的有效性。我们的项目页面位于https://lawrencexia2008.github.io/projects/tsqnet。
translated by 谷歌翻译
由于现实世界中标记的数据的昂贵性,以伪标签为基础的半监督对象探测器具有吸引力。但是,处理令人困惑的样本是不平凡的:放弃有价值的混乱样本会损害模型的概括,同时将其用于训练会加剧由于不可避免的错误标记引起的确认偏见问题。为了解决这个问题,本文提议在没有标签校正的情况下主动使用令人困惑的样品。具体而言,将虚拟类别(VC)分配给每个混乱的样本,以便即使没有具体标签,它们也可以安全地为模型优化做出贡献。它归因于将训练样本与虚拟类别之间的嵌入距离指定为类间距离的下限。此外,我们还修改了本地化损失,以允许位置回归的高质量边界。广泛的实验表明,所提出的VC学习显着超过了最新的,尤其是使用少量可用标签。
translated by 谷歌翻译
可见红外人重新识别(VI-REID)由于可见和红外模式之间存在较大的差异而受到挑战。大多数开创性方法通过学习模态共享和ID相关的功能来降低类内变型和跨性间差异。但是,在VI-REID中尚未充分利用一个显式模态共享提示。此外,现有特征学习范例在全局特征或分区特征条带上强加约束,忽略了全局和零件特征的预测一致性。为了解决上述问题,我们将构成估算作为辅助学习任务,以帮助vi-reid任务在端到端的框架中。通过以互利的方式联合培训这两个任务,我们的模型学习了更高质量的模态共享和ID相关的功能。在它之上,通过分层特征约束(HFC)无缝同步全局功能和本地特征的学习,前者使用知识蒸馏策略监督后者。两个基准VI-REID数据集的实验结果表明,该方法始终如一地通过显着的利润来改善最先进的方法。具体而言,我们的方法在RegDB数据集上取决于针对最先进的方法的近20美元\%$地图改进。我们的兴趣调查结果突出了vi-reid中辅助任务学习的使用。
translated by 谷歌翻译
数字医学图像的机器学习和流行的最新进展已经开辟了通过使用深卷积神经网络来解决挑战性脑肿瘤细分(BTS)任务的机会。然而,与非常广泛的RGB图像数据不同,在脑肿瘤分割中使用的医学图像数据在数据刻度方面相对稀缺,但在模态属性方面包含更丰富的信息。为此,本文提出了一种新的跨模型深度学习框架,用于从多种方式MRI数据分段脑肿瘤。核心思想是通过多模态数据挖掘丰富的模式以弥补数据量表不足。所提出的跨型号深度学习框架包括两个学习过程:跨模型特征转换(CMFT)过程和跨模型特征融合(CMFF)过程,其目的是通过跨越不同模态的知识来学习丰富的特征表示数据和融合知识分别来自不同的模态数据。在Brats基准上进行了综合实验,表明,与基线方法和最先进的方法相比,所提出的跨模型深度学习框架可以有效地提高大脑肿瘤分割性能。
translated by 谷歌翻译
与卷积层相比,完全连接的(FC)层更好地在捕获本地模式时更好地建模,但是更糟糕的是,因此通常不对图像识别的青睐。在本文中,我们提出了一种方法,局部注射,通过将培训的并行参数合并到FC内核中的训练参数并将训练的参数合并到FC层中。可以将位置喷射为新颖的结构重新参数化方法,因为它等效地通过转换参数来转换结构。基于此,我们提出了一个名为RepMLP块的多层 - Perceptron(MLP)块,它使用三个FC层提取特征,以及名为Repmlpnet的新颖体系结构。分层设计将RepMLPNET与其他同时提出的视觉MLPS区分开来。由于它生成不同级别的特征映射,它有资格作为下游任务的骨干模型,如语义分割。我们的结果表明,1)地区注射是MLP型号的一般方法; 2)与其他MLP相比,REPMLPNET具有良好的准确性效率折衷; 3)REPMLPNET是第一MLP,可无缝转移到CityCAPES语义分割。代码和模型可在https://github.com/dingxiaoh/repmlp上使用。
translated by 谷歌翻译
Masked image modeling (MIM) performs strongly in pre-training large vision Transformers (ViTs). However, small models that are critical for real-world applications cannot or only marginally benefit from this pre-training approach. In this paper, we explore distillation techniques to transfer the success of large MIM-based pre-trained models to smaller ones. We systematically study different options in the distillation framework, including distilling targets, losses, input, network regularization, sequential distillation, etc, revealing that: 1) Distilling token relations is more effective than CLS token- and feature-based distillation; 2) An intermediate layer of the teacher network as target perform better than that using the last layer when the depth of the student mismatches that of the teacher; 3) Weak regularization is preferred; etc. With these findings, we achieve significant fine-tuning accuracy improvements over the scratch MIM pre-training on ImageNet-1K classification, using all the ViT-Tiny, ViT-Small, and ViT-base models, with +4.2%/+2.4%/+1.4% gains, respectively. Our TinyMIM model of base size achieves 52.2 mIoU in AE20K semantic segmentation, which is +4.1 higher than the MAE baseline. Our TinyMIM model of tiny size achieves 79.6% top-1 accuracy on ImageNet-1K image classification, which sets a new record for small vision models of the same size and computation budget. This strong performance suggests an alternative way for developing small vision Transformer models, that is, by exploring better training methods rather than introducing inductive biases into architectures as in most previous works. Code is available at https://github.com/OliverRensu/TinyMIM.
translated by 谷歌翻译
Few Shot Instance Segmentation (FSIS) requires models to detect and segment novel classes with limited several support examples. In this work, we explore a simple yet unified solution for FSIS as well as its incremental variants, and introduce a new framework named Reference Twice (RefT) to fully explore the relationship between support/query features based on a Transformer-like framework. Our key insights are two folds: Firstly, with the aid of support masks, we can generate dynamic class centers more appropriately to re-weight query features. Secondly, we find that support object queries have already encoded key factors after base training. In this way, the query features can be enhanced twice from two aspects, i.e., feature-level and instance-level. In particular, we firstly design a mask-based dynamic weighting module to enhance support features and then propose to link object queries for better calibration via cross-attention. After the above steps, the novel classes can be improved significantly over our strong baseline. Additionally, our new framework can be easily extended to incremental FSIS with minor modification. When benchmarking results on the COCO dataset for FSIS, gFSIS, and iFSIS settings, our method achieves a competitive performance compared to existing approaches across different shots, e.g., we boost nAP by noticeable +8.2/+9.4 over the current state-of-the-art FSIS method for 10/30-shot. We further demonstrate the superiority of our approach on Few Shot Object Detection. Code and model will be available.
translated by 谷歌翻译