基于并行卷积核的Attention U-Net虚拟试衣方法研究

针对虚拟试衣中特征提取不足、人物肢体被衣服遮挡的问题,在基于图像特征保留的虚拟试衣方法基础上,提出基于并行卷积核的Attention U-Net虚拟试衣方法。该方法采用并行卷积核代替原有的3×3卷积核来提取特征,并在U-Net网络中融入注意力机制形成新的Attention U-Net图像合成器,通过不断调整网络学习参数,将模型放在数据集VITON Dataset上进行虚拟试衣实验。实验结果表明,与原方法相比,该方法能提取出更多的细节纹理,在结构相似性上提升了15.6%,虚拟试衣效果更好。     

FP-VTON：基于注意力机制的特征保持虚拟试衣网络

随着互联网经济和人工智能技术的飞速发展,越来越多的消费者选择在网上购买衣服,虚拟试衣技术可以为消费者提供方便、快捷的试衣服务,为消费者提供更好的网上购物体验。当前,基于二维图像的虚拟试衣方法可以摒弃三维虚拟试衣所需昂贵的硬件成本和时间代价,但是仍然存在无法有效适应模特的不同体型及大姿态动作的问题,无法充分保留目标服装复杂纹理特征和局部细节特征的问题。为此,提出一种基于注意力机制的特征保持虚拟试衣网络FP-VTON,通过服装变形和服装融合两阶段网络生成虚拟试穿结果。针对传统卷积难以适应非刚性物体大尺寸变形的问题在两阶段网络中引入了捕捉全局特征的特征注意力机制,针对TPS变换翘曲严重的问题提出了服装保真损失函数对网格上点间的距离和斜率进行约束。通过与相关工作的定量和可视化定性实验对比,充分验证了FP-VTON在大姿态形变、复杂纹理服装和特殊体型的情况下可以生成更加逼真的图像,更加有效地保留服装的复杂纹理细节和用户的身份信息。     

级联跨域特征融合的虚拟试衣

基于图像合成蒙版策略的虚拟试衣技术在扭曲服装和人体融合时能较好地保留服装细节。然而由于在试衣过程中人体和服装的位置和结构难以对齐,试衣结果容易产生严重的遮挡,影响视觉效果。为解决试衣过程中的遮挡问题,提出了一种基于U-Net的生成器。该生成器在U-Net解码器上添加级联的空间和通道注意力模块,从而实现了着装人体的局部特征和扭曲服装的和全局特征的跨域融合。形式上,首先采用卷积网络预测薄板样条插值（TPS）变换的方法将服装根据目标人体姿态进行扭曲;然后,将着装人体解析信息和扭曲服装输入到提出的生成器中,并获取对应服装区域的掩码图像以渲染中间结果;最后,采用掩码合成的策略来通过掩码处理将扭曲服装与中间结果合成得到最终的试衣结果。实验结果表明,所提方法不仅可以减少遮挡,而且增强了图像细节,相较于CP-VTON方法,产生的图像的平均峰值信噪比（PSNR）提高了10.47%,平均FID减小了47.28%,平均结构相似性（SSIM）提高了4.16%。     

级联跨域特征融合的虚拟试衣

基于图像合成蒙版策略的虚拟试衣技术在扭曲服装和人体融合时能较好地保留服装细节。然而由于在试衣过程中人体和服装的位置和结构难以对齐,试衣结果容易产生严重的遮挡,影响视觉效果。为解决试衣过程中的遮挡问题,提出了一种基于U-Net的生成器。该生成器在U-Net解码器上添加级联的空间和通道注意力模块,从而实现了着装人体的局部特征和扭曲服装的和全局特征的跨域融合。形式上,首先采用卷积网络预测薄板样条插值（TPS）变换的方法将服装根据目标人体姿态进行扭曲;然后,将着装人体解析信息和扭曲服装输入到提出的生成器中,并获取对应服装区域的掩码图像以渲染中间结果;最后,采用掩码合成的策略来通过掩码处理将扭曲服装与中间结果合成得到最终的试衣结果。实验结果表明,所提方法不仅可以减少遮挡,而且增强了图像细节,相较于CP-VTON方法,产生的图像的平均峰值信噪比（PSNR）提高了10.47%,平均FID减小了47.28%,平均结构相似性（SSIM）提高了4.16%。     

适于网络试穿的快速三维服装仿真方法

三维服装仿真技术是虚拟试衣的核心,目前三维服装仿真常用有限元技术来实现,该方法仿真花费的时间较长不能满足网络试衣的要求。提出了一种基于服装裁剪分片技术的三维服装仿真方法,该方法参考服装设计知识将待仿真服装划分为若干衣片,然后用贝塞尔曲面分别模拟这些衣片,最后利用纹理映射技术把服装布料的图案映射到相应的衣片,得到服装三维仿真模型。实验表明利用该方法得到的三维服装模型能够把服装的基本试穿效果展示出来,而且所需的时间很短,可以满足在线试穿的要求。     

个性化三维虚拟试衣系统研究

为满足用户对虚拟试衣的个性化需求和提高虚拟试衣体验，提出一种包括自动化蒙皮、基于单张图片人脸三维自动重建、人体参数化变形以及服装模型穿透处理等模块的个性化虚拟试衣系统。设计了自动化蒙皮算法，解决已有虚拟试衣服装模型制作成本高的问题；通过基于单张图片的三维人脸自动重建和人体参数化变形，满足消费者个性化需求;运用基于自动透明贴图计算的服装穿透处理方法，改进系统试衣效果。实验表明，所提出的系统能够以较低的构建与运行成本实现较好的试衣效果，提供良好的个性化虚拟试衣体验。     

智能三维虚拟试衣模特仿真系统设计*

针对服装物理仿真通常计算量庞大、在低端硬件平台或交互式环境进行高质量模拟的挑战,将人工生命思想引入服装纹理生成,基于混合虚拟现实技术研究开发了智能三维虚拟试衣模特仿真系统。通过在三维空间中构建与真实人体类似的三维虚拟模特作为消费者的试穿替身,同时设计实现了场景屏风功能,这样不但便于根据着装场合自由切换服装纹理,而且可以让消费者通过这一虚拟平台更为直观、自由地观察着装效果为了使三维试衣系统更为智能化,还建立了服装搭配合适度智能评价系统。     

虚拟试穿系统的设计与实现

为了方便人们的试穿过程,本文设计并实现了一款基于GEC6818开发板的虚拟试穿系统。试穿系统由摄像头、处理器和显示屏组成,摄像头获取用户照片,处理器将用户照片进行边缘检查、轮廓跟踪、人体数据提取后生成人体三维图像,并把试穿效果发送到显示器进行显示。本文的虚拟试穿系统能快速方便地让顾客进行试穿。     

两阶段可调节感知蒸馏网络的虚拟试衣方法

基于图像的虚拟试衣能将目标服装图像合成到人物图像上,此任务近年来因其在电子商务和时装图像编辑上广泛应用而备受关注.针对该任务的特点和已有方法的缺陷,提出一种两阶段可调节感知蒸馏方法(TS-APD).该方法包括3个步骤:①分别对服装图像和人物图像预训练2个语义分割网络,生成更准确的服装前景分割和上衣分割;②利用这2个语义...     

基于生成对抗网络的CT图像数据扩增

训练基于深度学习的计算机辅助诊断系统可以有效地从肺部CT图像中检测出是否受到COVID-19感染, 但目前面临的主要问题是缺乏高质量带标注的CT图像用于训练. 为了有效的解决该问题, 本文提出了一种基于生成对抗网络来扩增肺部CT图像的方法. 新方法通过生成不同感染区域的标签并通过泊松融合以增加生成图像的多样性; 通过训练对抗网络模型实现图像的转换生成, 以达到扩增CT图像的目的. 为验证生成数据的有效性, 基于扩增数据进一步做了分割实验. 通过图像生成实验和分割实验, 结果都表明, 本文提出的图像生成方法取得了较好的效果.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.