360 {\ Deg}成像最近遭受了很大的关注;然而,其角度分辨率比窄视野(FOV)透视图像相对较低,因为它通过使用具有相同传感器尺寸的鱼眼透镜而被捕获。因此,它有利于超声解析360 {\ DEG}图像。已经制造了一些尝试,但大多数是常规的投影(ERP),尽管尽管存在纬度依赖性失真,但仍然是360 {\ DEG}图像表示的方式之一。在这种情况下,随着输出高分辨率(HR)图像始终处于与低分辨率(LR)输入相同的ERP格式,当将HR图像转换为其他投影类型时可能发生另一信息丢失。在本文中,我们提出了从LR 360 {\ Deg}图像产生连续球面图像表示的新颖框架,旨在通过任意360 {\ deg}预测给定球形坐标处的RGB值。图像投影。具体地,我们首先提出了一种特征提取模块,该特征提取模块表示基于IcosaheDron的球面数据,并有效地提取球面上的特征。然后,我们提出了一种球形本地隐式图像功能(SLIIF)来预测球形坐标处的RGB值。这样,Spheresr在任意投影型下灵活地重建HR图像。各种基准数据集的实验表明,我们的方法显着超越了现有方法。
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中心位置是否完全能够代表像素?在离散的图像表示中表示具有它们的中心的像素的错误,但是在图像超分辨率(SR)上下文中的局域脉中的信号的聚合时,它更有意义地考虑每个像素。尽管任意级图像SR领域的基于坐标的隐式表示的能力很大,但该区域的像素的性质不完全考虑。为此,我们提出了集成的位置编码(IPE),通过聚合在像素区域上聚合频率信息来扩展传统的位置编码。我们将IPE应用于最先进的任意级图像超分辨率方法:本地隐式图像功能(LIIF),呈现IPE-LIIF。我们通过定量和定性评估显示IPE-LIIF的有效性,并进一步证明了IPE泛化能力与更大的图像尺度和基于多种隐式的方法。代码将被释放。
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如今,由于屏幕共享,远程合作和在线教育的广泛应用,屏幕内容存在爆炸性增长。为了匹配有限终端带宽,可以缩小高分辨率(HR)屏幕内容并压缩。在接收器侧,低分辨率(LR)屏幕内容图像(SCI)的超分辨率(SR)由HR显示器或用户缩小以供详细观察。然而,由于图像特性非常不同的图像特性以及在任意尺度下浏览的SCI浏览要求,图像SR方法主要针对自然图像设计不概括SCI。为此,我们为SCISR提出了一种新颖的隐式变压器超分辨率网络(ITSRN)。对于任意比率的高质量连续SR,通过所提出的隐式变压器从密钥坐标处的图像特征推断出查询坐标处的像素值,并且提出了隐式位置编码方案来聚合与查询相似的相邻像素值。使用LR和HR SCI对构建基准SCI1K和SCI1K压缩数据集。广泛的实验表明,提出的ITSRN显着优于压缩和未压缩的SCI的几种竞争连续和离散SR方法。
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Informative features play a crucial role in the single image super-resolution task. Channel attention has been demonstrated to be effective for preserving information-rich features in each layer. However, channel attention treats each convolution layer as a separate process that misses the correlation among different layers. To address this problem, we propose a new holistic attention network (HAN), which consists of a layer attention module (LAM) and a channel-spatial attention module (CSAM), to model the holistic interdependencies among layers, channels, and positions. Specifically, the proposed LAM adaptively emphasizes hierarchical features by considering correlations among layers. Meanwhile, CSAM learns the confidence at all the positions of each channel to selectively capture more informative features. Extensive experiments demonstrate that the proposed HAN performs favorably against the state-ofthe-art single image super-resolution approaches.
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图像翘曲的目的是将矩形网格定义的图像重新设计为任意形状。最近,隐式神经功能在以连续方式表示图像时表现出了显着的性能。然而,独立的多层感知器受到学习高频傅立叶系数的影响。在本文中,我们提出了图像翘曲(LTEW)的局部纹理估计器,然后提出隐式神经表示,以将图像变形为连续形状。从深度超分辨率(SR)主链估计的局部纹理乘以坐标转换的局部变化雅各布矩阵,以预测扭曲的图像的傅立叶响应。我们的基于LTEW的神经功能优于现有的扭曲方法,用于不对称尺度的SR和跨术变换。此外,我们的算法很好地概括了任意坐标变换,例如具有较大放大因子和等应角投影(ERP)的透视变换,这些变换在训练中未提供。
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This paper explores the problem of reconstructing high-resolution light field (LF) images from hybrid lenses, including a high-resolution camera surrounded by multiple low-resolution cameras. The performance of existing methods is still limited, as they produce either blurry results on plain textured areas or distortions around depth discontinuous boundaries. To tackle this challenge, we propose a novel end-to-end learning-based approach, which can comprehensively utilize the specific characteristics of the input from two complementary and parallel perspectives. Specifically, one module regresses a spatially consistent intermediate estimation by learning a deep multidimensional and cross-domain feature representation, while the other module warps another intermediate estimation, which maintains the high-frequency textures, by propagating the information of the high-resolution view. We finally leverage the advantages of the two intermediate estimations adaptively via the learned attention maps, leading to the final high-resolution LF image with satisfactory results on both plain textured areas and depth discontinuous boundaries. Besides, to promote the effectiveness of our method trained with simulated hybrid data on real hybrid data captured by a hybrid LF imaging system, we carefully design the network architecture and the training strategy. Extensive experiments on both real and simulated hybrid data demonstrate the significant superiority of our approach over state-of-the-art ones. To the best of our knowledge, this is the first end-to-end deep learning method for LF reconstruction from a real hybrid input. We believe our framework could potentially decrease the cost of high-resolution LF data acquisition and benefit LF data storage and transmission.
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Learning continuous image representations is recently gaining popularity for image super-resolution (SR) because of its ability to reconstruct high-resolution images with arbitrary scales from low-resolution inputs. Existing methods mostly ensemble nearby features to predict the new pixel at any queried coordinate in the SR image. Such a local ensemble suffers from some limitations: i) it has no learnable parameters and it neglects the similarity of the visual features; ii) it has a limited receptive field and cannot ensemble relevant features in a large field which are important in an image; iii) it inherently has a gap with real camera imaging since it only depends on the coordinate. To address these issues, this paper proposes a continuous implicit attention-in-attention network, called CiaoSR. We explicitly design an implicit attention network to learn the ensemble weights for the nearby local features. Furthermore, we embed a scale-aware attention in this implicit attention network to exploit additional non-local information. Extensive experiments on benchmark datasets demonstrate CiaoSR significantly outperforms the existing single image super resolution (SISR) methods with the same backbone. In addition, the proposed method also achieves the state-of-the-art performance on the arbitrary-scale SR task. The effectiveness of the method is also demonstrated on the real-world SR setting. More importantly, CiaoSR can be flexibly integrated into any backbone to improve the SR performance.
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光场(LF)摄像机记录了光线的强度和方向,并将3D场景编码为4D LF图像。最近,为各种LF图像处理任务提出了许多卷积神经网络(CNN)。但是,CNN有效地处理LF图像是一项挑战,因为空间和角度信息与不同的差异高度缠绕。在本文中,我们提出了一种通用机制,以将这些耦合信息解开以进行LF图像处理。具体而言,我们首先设计了一类特定领域的卷积,以将LFS与不同的维度解开,然后通过设计特定于任务的模块来利用这些分离的功能。我们的解开机制可以在事先之前很好地纳入LF结构,并有效处理4D LF数据。基于提出的机制,我们开发了三个网络(即distgssr,distgasr和Distgdisp),用于空间超分辨率,角度超分辨率和差异估计。实验结果表明,我们的网络在所有这三个任务上都实现了最先进的性能,这表明了我们解散机制的有效性,效率和一般性。项目页面:https://yingqianwang.github.io/distglf/。
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Neural volumetric representations have become a widely adopted model for radiance fields in 3D scenes. These representations are fully implicit or hybrid function approximators of the instantaneous volumetric radiance in a scene, which are typically learned from multi-view captures of the scene. We investigate the new task of neural volume super-resolution - rendering high-resolution views corresponding to a scene captured at low resolution. To this end, we propose a neural super-resolution network that operates directly on the volumetric representation of the scene. This approach allows us to exploit an advantage of operating in the volumetric domain, namely the ability to guarantee consistent super-resolution across different viewing directions. To realize our method, we devise a novel 3D representation that hinges on multiple 2D feature planes. This allows us to super-resolve the 3D scene representation by applying 2D convolutional networks on the 2D feature planes. We validate the proposed method's capability of super-resolving multi-view consistent views both quantitatively and qualitatively on a diverse set of unseen 3D scenes, demonstrating a significant advantage over existing approaches.
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高光谱图像(HSI)没有额外辅助图像的超分辨率仍然是由于其高维光谱图案的恒定挑战,其中学习有效的空间和光谱表示是基本问题。最近,隐式的神经表示(INR)正在进行进步,作为新颖且有效的代表,特别是在重建任务中。因此,在这项工作中,我们提出了一种基于INR的新颖的HSI重建模型,其通过将空间坐标映射到其对应的光谱辐射值值的连续函数来表示HSI。特别地,作为INR的特定实现,参数模型的参数是通过使用卷积网络在特征提取的超通知来预测的。它使连续功能以内容感知方式将空间坐标映射到像素值。此外,周期性空间编码与重建过程深度集成,这使得我们的模型能够恢复更高的频率细节。为了验证我们模型的功效,我们在三个HSI数据集(洞穴,NUS和NTIRE2018)上进行实验。实验结果表明,与最先进的方法相比,该建议的模型可以实现竞争重建性能。此外,我们提供了对我们模型各个组件的效果的消融研究。我们希望本文可以服务器作为未来研究的效率参考。
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全景图像可以同时展示周围环境的完整信息,并且在虚拟旅游,游戏,机器人技术等方面具有许多优势。但是,全景深度估计的进度无法完全解决由常用的投射方法引起的失真和不连续性问题。本文提出了SphereDepth,这是一种新型的全景深度估计方法,该方法可直接预测球形网格的深度而无需投影预处理。核心思想是建立全景图像与球形网格之间的关系,然后使用深层神经网络在球形域上提取特征以预测深度。为了解决高分辨率全景数据带来的效率挑战,我们介绍了两个超参数,以平衡推理速度和准确性。在三个公共全景数据集中验证,SphereDepth通过全景深度估算的最新方法实现了可比的结果。从球形域设置中受益,球形部可以产生高质量的点云,并显着缓解失真和不连续性问题。
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最近有一种隐式神经功能棚灯,代表任意分辨率的图像。然而,独立的多层Perceptron(MLP)在学习高频分量中显示了有限的性能。在本文中,我们提出了一种局部纹理估计器(LTE),用于自然图像的主要频率估计器,使得隐式功能以连续方式重建图像的同时捕获精细细节。当用深层超分辨率(SR)架构共同培训时,LTE能够在2D傅里叶空间中表征图像纹理。我们表明,基于LTE的神经功能优于所有数据集的任意级别的现有深度SR方法,以及所有规模因素。此外,与以前的作品相比,我们的实施呈现了最短的运行时间。源代码将打开。
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现实世界图像超分辨率(SR)的关键挑战是在低分辨率(LR)图像中恢复具有复杂未知降解(例如,下采样,噪声和压缩)的缺失细节。大多数以前的作品还原图像空间中的此类缺失细节。为了应对自然图像的高度多样性,他们要么依靠难以训练和容易训练和伪影的不稳定的甘体,要么诉诸于通常不可用的高分辨率(HR)图像中的明确参考。在这项工作中,我们提出了匹配SR(FEMASR)的功能,该功能在更紧凑的特征空间中恢复了现实的HR图像。与图像空间方法不同,我们的FEMASR通过将扭曲的LR图像{\ IT特征}与我们预读的HR先验中的无失真性HR对应物匹配来恢复HR图像,并解码匹配的功能以获得现实的HR图像。具体而言,我们的人力资源先验包含一个离散的特征代码簿及其相关的解码器,它们在使用量化的生成对抗网络(VQGAN)的HR图像上预估计。值得注意的是,我们在VQGAN中结合了一种新型的语义正则化,以提高重建图像的质量。对于功能匹配,我们首先提取由LR编码器组成的LR编码器的LR功能,然后遵循简单的最近邻居策略,将其与预读的代码簿匹配。特别是,我们为LR编码器配备了与解码器的残留快捷方式连接,这对于优化功能匹配损耗至关重要,还有助于补充可能的功能匹配错误。实验结果表明,我们的方法比以前的方法产生更现实的HR图像。代码以\ url {https://github.com/chaofengc/femasr}发布。
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Existing convolutional neural networks (CNN) based image super-resolution (SR) methods have achieved impressive performance on bicubic kernel, which is not valid to handle unknown degradations in real-world applications. Recent blind SR methods suggest to reconstruct SR images relying on blur kernel estimation. However, their results still remain visible artifacts and detail distortion due to the estimation errors. To alleviate these problems, in this paper, we propose an effective and kernel-free network, namely DSSR, which enables recurrent detail-structure alternative optimization without blur kernel prior incorporation for blind SR. Specifically, in our DSSR, a detail-structure modulation module (DSMM) is built to exploit the interaction and collaboration of image details and structures. The DSMM consists of two components: a detail restoration unit (DRU) and a structure modulation unit (SMU). The former aims at regressing the intermediate HR detail reconstruction from LR structural contexts, and the latter performs structural contexts modulation conditioned on the learned detail maps at both HR and LR spaces. Besides, we use the output of DSMM as the hidden state and design our DSSR architecture from a recurrent convolutional neural network (RCNN) view. In this way, the network can alternatively optimize the image details and structural contexts, achieving co-optimization across time. Moreover, equipped with the recurrent connection, our DSSR allows low- and high-level feature representations complementary by observing previous HR details and contexts at every unrolling time. Extensive experiments on synthetic datasets and real-world images demonstrate that our method achieves the state-of-the-art against existing methods. The source code can be found at https://github.com/Arcananana/DSSR.
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Convolutional Neural Network (CNN)-based image super-resolution (SR) has exhibited impressive success on known degraded low-resolution (LR) images. However, this type of approach is hard to hold its performance in practical scenarios when the degradation process is unknown. Despite existing blind SR methods proposed to solve this problem using blur kernel estimation, the perceptual quality and reconstruction accuracy are still unsatisfactory. In this paper, we analyze the degradation of a high-resolution (HR) image from image intrinsic components according to a degradation-based formulation model. We propose a components decomposition and co-optimization network (CDCN) for blind SR. Firstly, CDCN decomposes the input LR image into structure and detail components in feature space. Then, the mutual collaboration block (MCB) is presented to exploit the relationship between both two components. In this way, the detail component can provide informative features to enrich the structural context and the structure component can carry structural context for better detail revealing via a mutual complementary manner. After that, we present a degradation-driven learning strategy to jointly supervise the HR image detail and structure restoration process. Finally, a multi-scale fusion module followed by an upsampling layer is designed to fuse the structure and detail features and perform SR reconstruction. Empowered by such degradation-based components decomposition, collaboration, and mutual optimization, we can bridge the correlation between component learning and degradation modelling for blind SR, thereby producing SR results with more accurate textures. Extensive experiments on both synthetic SR datasets and real-world images show that the proposed method achieves the state-of-the-art performance compared to existing methods.
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捕获场景的空间和角度信息的光场(LF)成像无疑是有利于许多应用。尽管已经提出了用于LF采集的各种技术,但是在角度和空间上实现的既仍然是技术挑战。本文,提出了一种基于学习的方法,其应用于3D末面图像(EPI)以重建高分辨率LF。通过2级超分辨率框架,所提出的方法有效地解决了各种LF超分辨率(SR)问题,即空间SR,Angular SR和角空间SR。虽然第一阶段向Up-Sample EPI体积提供灵活的选择,但是由新型EPI体积的细化网络(EVRN)组成的第二阶段,基本上提高了高分辨率EPI体积的质量。从7个发布的数据集的90个挑战合成和实际灯田场景的广泛评估表明,所提出的方法优于空间和角度超分辨率问题的大型延伸的最先进的方法,即平均值峰值信号到噪声比为2.0 dB,1.4 dB和3.14 dB的空间SR $ \ Times 2 $,Spatial SR $ \ Times 4 $和Angular SR。重建的4D光场展示了所有透视图像的平衡性能分布,与先前的作品相比,卓越的视觉质量。
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最新的2D图像压缩方案依赖于卷积神经网络(CNN)的力量。尽管CNN为2D图像压缩提供了有希望的观点,但将此类模型扩展到全向图像并不简单。首先,全向图像具有特定的空间和统计特性,这些特性无法通过当前CNN模型完全捕获。其次,在球体上,基本的数学操作组成了CNN体系结构,例如翻译和采样。在本文中,我们研究了全向图像的表示模型的学习,并建议使用球体的HealPix均匀采样的属性来重新定义用于全向图像的深度学习模型中使用的数学工具。特别是,我们:i)提出了在球体上进行新的卷积操作的定义,以保持经典2D卷积的高表现力和低复杂性; ii)适应标准的CNN技术,例如步幅,迭代聚集和像素改组到球形结构域;然后iii)将我们的新框架应用于全向图像压缩的任务。我们的实验表明,与应用于等应角图像的类似学习模型相比,我们提出的球形溶液可带来更好的压缩增益,可以节省比特率的13.7%。同样,与基于图形卷积网络的学习模型相比,我们的解决方案支持更具表现力的过滤器,这些过滤器可以保留高频并提供压缩图像的更好的感知质量。这样的结果证明了拟议框架的效率,该框架为其他全向视觉任务任务打开了新的研究场所,以在球体歧管上有效实施。
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我们提出了一个新颖的框架,以从单个低分辨率输入图像中重建超分辨率的人形。该方法克服了从单个图像中重建3D人类形状的现有方法的局限性,该方法需要高分辨率图像以及辅助数据(例如表面正常或参数模型)以重建高尾巴形状。所提出的框架代表具有高确定隐式函数的重建形状。该方法类似于2D图像超分辨率的目标,它从低分辨率形状到其高分辨率对应物中学习了映射,并应用于从低分辨率图像中重建3D形状细节。该方法是经过训练的端到端,采用了新的损失函数,该功能估计了相同3D表面形状的低分辨率和高分辨率表示之间丢失的信息。对衣服人员进行单图像重建的评估表明,我们的方法从没有辅助数据的低分辨率图像中实现了高确定的表面重建。广泛的实验表明,所提出的方法可以估计超分辨率的人几何形状,其细节水平明显高于使用在低分辨率图像上使用的方法。
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尽管已经通过深度学习技术开发了凝视估计方法,但没有采取诸如以50像素或更少的像素宽度或更少的像素宽度的低分辨率面部图像中准确性能的方法。为了在具有挑战性的低分辨率条件下解决限制,我们提出了高频专注的超级分辨凝视估计网络,即Haze-Net。我们的网络改善了输入图像的分辨率,并通过基于高频注意力块提出的超级分辨率模块增强了眼睛特征和这些边界。此外,我们的凝视估计模块利用眼睛的高频组件以及全球外观图。我们还利用面部的结构位置信息来近似头姿势。实验结果表明,即使在具有28x28像素的低分辨率面部图像中,提出的方法也表现出强大的凝视估计性能。该工作的源代码可在https://github.com/dbseorms16/haze_net/上获得。
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随着深度学习(DL)的出现,超分辨率(SR)也已成为一个蓬勃发展的研究领域。然而,尽管结果有希望,但该领域仍然面临需要进一步研究的挑战,例如,允许灵活地采样,更有效的损失功能和更好的评估指标。我们根据最近的进步来回顾SR的域,并检查最新模型,例如扩散(DDPM)和基于变压器的SR模型。我们对SR中使用的当代策略进行了批判性讨论,并确定了有前途但未开发的研究方向。我们通过纳入该领域的最新发展,例如不确定性驱动的损失,小波网络,神经体系结构搜索,新颖的归一化方法和最新评估技术来补充先前的调查。我们还为整章中的模型和方法提供了几种可视化,以促进对该领域趋势的全球理解。最终,这篇综述旨在帮助研究人员推动DL应用于SR的界限。
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