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Hierarchical Deep Learning Networks for Classification of Ultrasonic Thyroid Nodules 超声甲状腺结节分类的层次深度学习网络
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2022-07-01 DOI: 10.2352/j.imagingsci.technol.2022.66.4.040408
Bo Wang, Fengqiang Yuan, Zhiwei Lv, Ying He, Zongren Chen, Jianhua Hu, Jun Yu, Shuzhao Zheng, Hai Liu
. Thyroid nodules classification in ultrasound images is actively researched in the field of medical image processing. However, due to the low quality of ultrasound images, severe speckle noise, the complexity and diversity of nodules, etc., the classification and diagnosis of thyroid nodules are extremely challenging. At present, deep learning has been widely used in the field of medical image processing, and has achieved good results. However, there are still many problems to be solved. To address these issues, we propose a mask-guided hierarchical deep learning (MHDL) framework for the thyroid nodules classification. Specifically, we first develop a Mask RCNN network to locate thyroid nodules as the region of interest (ROI) for each image, to remove confounding information from input ultrasound images and extract texture, shape and radiology features as the low dimensional features. We then design a residual attention network to extract depth feature map of ROI, and combine the above low dimensional features to form a mixed feature space via dimension alignment technology. Finally, we present an AttentionDrop-based convolutional neural network to implement the classification of benign and malignant thyroid nodules in the mixed feature space. The experimental results show that our proposed method can obtain accurate nodule classification results, and hierarchical deep learning network can further improve the classification performance, which has immense clinical application value. c (cid:13) 2022 Society for Imaging Science and Technology. [DOI: 10.2352
超声图像中甲状腺结节的分类在医学图像处理领域得到了积极的研究。然而,由于超声图像质量低、斑点噪声严重、结节的复杂性和多样性等,甲状腺结节的分类和诊断极具挑战性。目前,深度学习已广泛应用于医学图像处理领域,并取得了良好的效果。然而,仍然有许多问题需要解决。为了解决这些问题,我们提出了一种用于甲状腺结节分类的掩模引导分层深度学习(MHDL)框架。具体而言,我们首先开发了一个Mask RCNN网络,将甲状腺结节定位为每个图像的感兴趣区域(ROI),从输入超声图像中去除混杂信息,并提取纹理、形状和放射学特征作为低维特征。然后,我们设计了一个残差注意力网络来提取ROI的深度特征图,并通过维度对齐技术将上述低维特征组合起来形成混合特征空间。最后,我们提出了一种基于AttentionDrop的卷积神经网络,以在混合特征空间中实现良性和恶性甲状腺结节的分类。实验结果表明,我们提出的方法可以获得准确的结节分类结果,分层深度学习网络可以进一步提高分类性能,具有巨大的临床应用价值。c(cid:13)2022影像科学与技术学会。[DOI:10.2352
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引用次数: 2
Natural Feature Recognition of Multi Pose Face Images based on Augmented Reality 基于增强现实的多姿态人脸图像自然特征识别
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2022-07-01 DOI: 10.2352/j.imagingsci.technol.2022.66.4.040410
Wenda Xie, Jun Yu, Xiaobo Jiang, Zongren Chen
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引用次数: 0
DiM-PCNet:3D Point Clouds Classification with Multi-scale and Multi-level Feature Net DiM-PCNet:基于多尺度和多层次特征网的三维点云分类
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2022-07-01 DOI: 10.2352/j.imagingsci.technol.2022.66.4.040405
Kun Zhang, Liting Zhang, Xiao-hong Wang, Xinshuai Hua, Xuan Gao
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引用次数: 0
Modelling of A New X-Ray Backscatter Imaging System: Simulation Investigation 一种新型x射线后向散射成像系统的建模:仿真研究
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2022-05-01 DOI: 10.2352/j.imagingsci.technol.2022.66.3.030510
Selvagumar Senthurran, W. T. Yuen Peter, U. Soori, J. Piper, J. David, D. Andre, M. Richardson
.
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引用次数: 0
Acceptability-based Brand Color Tolerance, A Case Study 基于可接受性的品牌色彩容忍度案例研究
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2022-05-01 DOI: 10.2352/j.imagingsci.technol.2022.66.3.030509
Robert Y. Chung, Y. Liu
. The Pantone R (cid:13) Formula Guide (or Guide), printed using specially-formulated inks on specified substrates, has been used widely by brands to specify brand color aims. While the Guide is silent on brand color tolerance, there are two competing criteria that influence the brand color tolerance, i.e., perceptibility and acceptability. Perceptibility-based color tolerance focuses on “Can I see the difference?” and the permissive difference is in the just-noticeable difference (JND) region. Acceptability-based color tolerance, focusing on “Can I accept the outcome?”, requires fit-for-use cases to identify what the just-acceptable difference (JAD) is. Instead of conducting psychometric tests, this research uses the 2019 Pantone R (cid:13) Formula (Coated) Guide, consisting of 2140 CIELAB colors, and data analyses of the “neighboring color difference” to investigate what is the acceptability-based color tolerance. The result shows that the acceptability-based color tolerance (3 (cid:49) E 00 ) has more margin than the perceptibility-based color tolerance (2 (cid:49) E 00 ).
. 彩通R (cid:13)配方指南(或称指南),使用特殊配方的油墨在指定的基材上印刷,已被各品牌广泛用于指定品牌色彩目标。虽然《指南》没有提及品牌色彩容忍度,但影响品牌色彩容忍度的两个相互竞争的标准,即可感知性和可接受性。基于感知的颜色容忍度关注的是“我能看到区别吗?”而容许差位于刚可察觉差(JND)区。基于可接受性的色彩容忍度,关注“我能接受结果吗?”,需要适合用例来确定什么是刚刚可接受的差异(JAD)。本研究没有进行心理测量测试,而是使用由2140种CIELAB颜色组成的2019年潘通R (cid:13)配方(涂层)指南,并对“相邻色差”进行数据分析,以研究什么是基于可接受度的色彩容限。结果表明,基于可接受度的颜色容忍度(3 (cid:49) e00)比基于感知度的颜色容忍度(2 (cid:49) e00)有更大的余量。
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引用次数: 0
The Objective Measurement and Subjective Perception of Flexible ENT Endoscopes’ Image Quality 柔性耳鼻喉科内窥镜图像质量的客观测量与主观感知
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2022-05-01 DOI: 10.2352/j.imagingsci.technol.2022.66.3.030508
G. Geleijnse, L. Veder, M. Hakkesteegt, R. M. Metselaar
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引用次数: 2
Digital Pre-Distorted One-Step Phase Retrieval Algorithm for Real-Time Hologram Generation for Holographic Displays 全息显示器实时全息图生成的数字预失真一步相位恢复算法
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2022-04-14 DOI: 10.2352/J.ImagingSci.Technol.2023.67.3.030405
Jinze Sha, A. Goldney, A. Kadis, Jana Skirnewskaja, T. Wilkinson
In a computer-generated holographic projection system, the image is reconstructed via the diffraction of light from a spatial light modulator. In this process, several factors could contribute to non-linearities between the reconstruction and the target image. This paper evaluates the non-linearity of the overall holographic projection system experimentally, using binary phase holograms computed using the one-step phase retrieval (OSPR) algorithm, and then applies a digital pre-distortion (DPD) method to correct for the non-linearity. Both a notable increase in reconstruction quality and a significant reduction in mean squared error were observed, proving the effectiveness of the proposed DPD-OSPR algorithm.
在计算机生成的全息投影系统中,通过来自空间光调制器的光的衍射来重建图像。在这个过程中,几个因素可能导致重建和目标图像之间的非线性。本文利用一步相位恢复(OSPR)算法计算的二元相位全息图,对整个全息投影系统的非线性进行了实验评估,然后应用数字预失真(DPD)方法对非线性进行校正。观察到重建质量的显著提高和均方误差的显著降低,证明了所提出的DPD-OSPR算法的有效性。
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引用次数: 0
On-demand Electrohydrodynamic Jetting of an Ethylene Glycol and Water Mixture—System of Controlled Picoliter Fluid Deposition 按需电流体动力喷射乙二醇和水的混合物-控制皮升流体沉积系统
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2021-07-01 DOI: 10.2352/j.imagingsci.technol.2021.65.4.040405
J. F. Dijksman, U. Stachewicz
Abstract On-demand electrohydrodynamic jetting also called electrohydrodynamic atomization (EHDA) is a method to jet small amounts of fluid out of a nozzle with a relatively large diameter by switching on and off an electrical field between the nozzle and the substrate. The total amount of volume deposited is up to 5 pL. The set-up consists of a vertically placed glass pipette with a small nozzle directed downward and a flat substrate placed close to the end of the nozzle. Inside the pipette, an electrode is mounted close to the entrance of the nozzle. The electrode is connected to a high voltage power amplifier. Upon switching on the electrical field, the apparent surface tension drops, the meniscus deforms into a cone and fluid starts to flow toward the nozzle deforming the meniscus. At a certain moment the cone reaches the Taylor cone dimensions and from its tip a jet emerges that decomposes into a stream of charged fL droplets that fly toward the substrate. This process stops when the pulse is switched off. After switching off, the meniscus returns slowly to its equilibrium position. The process is controlled by different time constants, such as the slew rate of the power amplifier and the RC time of the electrical circuit composed of the electrical resistance in the fluid contained in the nozzle between the electrode and the meniscus, and the capacitance of the gap between the meniscus and the flat substrate. Another time constant deals with the fluid flow during the growth of the meniscus, directly after switching on the pulse. This fluid flow is driven by hydrostatic pressure and opposed by a viscous drag in the nozzle. The final fluid flow during droplet formation is governed by the balance between the drag of the charge carriers inside the fluid, caused by the current associated with the charged droplets leaving the meniscus and the viscous drag. These different phenomena will be discussed theoretically and compared to experimental results.
按需电流体动力喷射也称为电流体动力雾化(EHDA),是一种通过开关喷嘴与基材之间的电场,将少量流体从直径较大的喷嘴中喷射出来的方法。沉积的体积总量高达5 pL。该装置包括一个垂直放置的玻璃移液器,带有一个向下的小喷嘴和一个靠近喷嘴末端的平坦基板。在移液器内部,电极安装在靠近喷嘴入口的地方。电极连接到高压功率放大器上。打开电场后,表观表面张力下降,半月板变形成锥体,流体开始流向喷嘴,使半月板变形。在某一时刻,锥体达到泰勒锥体尺寸,从其尖端喷出一股射流,分解成一束带电的fL液滴,飞向基材。当脉冲关闭时,该过程停止。关闭后,半月板缓慢恢复到平衡位置。该过程由不同的时间常数控制,如功率放大器的摆幅率和由电极与半月板之间的喷嘴中所含流体中的电阻以及半月板与平面基板之间间隙的电容组成的电路的RC时间。另一个时间常数处理半月板生长过程中的流体流动,直接在打开脉冲后。这种流体流动由静水压力驱动,并受到喷嘴内粘性阻力的阻碍。在液滴形成过程中,最终的流体流动是由流体内部电荷载体的阻力和粘性阻力之间的平衡所控制的,这种阻力是由与带电液滴离开半月板相关的电流和粘性阻力引起的。这些不同的现象将从理论上进行讨论,并与实验结果进行比较。
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引用次数: 1
SoftPrint: Investigating Haptic Softness Perception of 3D Printed Soft Object in FDM 3D Printers SoftPrint:研究FDM 3D打印机中3D打印软对象的触觉柔软度感知
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2021-07-01 DOI: 10.2352/j.imagingsci.technol.2021.65.4.040406
Motoki Miyoshi, Parinya Punpongsanon, D. Iwai, Kosuke Sato
Abstract FDM 3D printers allow massive creativity in personal products, but their potential has been limited due to inability to manipulating material properties. Previous work had demonstrated that the desired roughness could be presented simply by controlling the spatial density of tiny pins on a printed surface. This article offers a means of providing the desired softness perception of a printed surface and the desired roughness to expand the haptic dimension over which a user can exert control. Specifically, we control the softness by manipulating the infill structures of a printed surface. However, it is known that a skin contact area affects softness perception. The roughness, which is controlled by pins’ density, may also affect the perceived softness of a printed surface. Therefore, we investigate how the internal structures and the density of the pins affect softness perception. Through psychophysical experiments, we derive a computational model that estimates the perceived softness from the density of the pins and the infill density of a printed surface.
抽象FDM 3D打印机允许在个人产品中发挥巨大的创造力,但由于无法操纵材料特性,其潜力受到限制。先前的工作已经证明,只需控制印刷表面上微小引脚的空间密度,就可以获得所需的粗糙度。本文提供了一种提供印刷表面的期望柔软度感知和期望粗糙度的方法,以扩展用户可以施加控制的触觉尺寸。具体来说,我们通过操纵打印表面的填充结构来控制柔软度。然而,已知皮肤接触区域会影响柔软度感知。粗糙度由针的密度控制,也可能影响印刷表面的柔软度。因此,我们研究了引脚的内部结构和密度如何影响柔软度感知。通过心理物理学实验,我们导出了一个计算模型,该模型根据引脚的密度和印刷表面的填充密度来估计感知的柔软度。
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引用次数: 5
Digital Textile Ink-Jet Printing Innovation: Development and Evaluation of Digital Denim Technology 数字纺织喷墨印花创新:数字牛仔技术的发展与评价
IF 1 4区 计算机科学 Q3 Chemistry Pub Date : 2021-07-01 DOI: 10.2352/j.imagingsci.technol.2021.65.4.040407
Ming Wang, Lisa Parrillo-Chapman, Lori Rothenberg, Yixin Liu, Jiajun Liu
Abstract This research explored the potential for ink-jet printing to replicate the coloration and finishing techniques of traditional denim fabric and standardized the reproduction and evaluation procedure. Although denim fabric is widely consumed and very popular, one drawback to denim is that the finishing and manufacturing processes are energy and water intensive and can cause environmental hazards as well as generation of pollution through water waste, particularly at the finishing stage. Textile ink-jet printing has the potential to replicate some of the coloration and finishing techniques of traditional denim fabric without negative environmental impacts. A two-phase research project was conducted. In Phase I (P1), an optimal standard production workflow for digital denim reproduction (including color and finishing effects) was established, and six different denim samples were reproduced based on the workflow. In Phase II, an expert visual assessment protocol was developed to evaluate the acceptance of the replicated digital denim. Twelve ink-jet printing, color science, and denim industry experts finished the assessment.
摘要:本研究探讨喷墨印刷复制传统牛仔布织物的着色和整理技术的潜力,并对复制和评价过程进行标准化。虽然牛仔布被广泛消费并且非常受欢迎,但牛仔布的一个缺点是整理和制造过程是能源和水密集型的,并且会造成环境危害以及通过水产生污染,特别是在整理阶段。纺织品喷墨印刷有可能复制传统牛仔布织物的一些着色和整理技术,而不会对环境产生负面影响。研究项目分两个阶段进行。在第一阶段(P1)中,建立了数字化牛仔布再现的最佳标准生产流程(包括颜色和整理效果),并根据该流程再现了6种不同的牛仔布样品。在第二阶段,制定了专家视觉评估方案来评估复制数字牛仔布的接受程度。12位喷墨印刷、色彩学和牛仔布行业专家完成了评估。
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引用次数: 0
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Journal of Imaging Science and Technology
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