A Systematic Review of Computer Vision Techniques for Quality Control in End-of-Line Visual Inspection of Antenna Parts

The rapid evolution of wireless communication technologies has underscored the critical role of antennas in ensuring seamless connectivity.Antenna defects,ranging from manufacturing imperfections to environmental wear,pose significant challenges to the reliability and performance of communication systems.This review paper navigates the landscape of antenna defect detection,emphasizing the need for a nuanced understanding of various defect types and the associated challenges in visual detection.This review paper serves as a valuable resource for researchers,engineers,and practitioners engaged in the design and maintenance of communication systems.The insights presented here pave the way for enhanced reliability in antenna systems through targeted defect detection measures.In this study,a comprehensive literature analysis on computer vision algorithms that are employed in end-of-line visual inspection of antenna parts is presented.The PRISMA principles will be followed throughout the review,and its goals are to provide a summary of recent research,identify relevant computer vision techniques,and evaluate how effective these techniques are in discovering defects during inspections.It contains articles from scholarly journals as well as papers presented at conferences up until June 2023.This research utilized search phrases that were relevant,and papers were chosen based on whether or not they met certain inclusion and exclusion criteria.In this study,several different computer vision approaches,such as feature extraction and defect classification,are broken down and analyzed.Additionally,their applicability and performance are discussed.The review highlights the significance of utilizing a wide variety of datasets and measurement criteria.The findings of this study add to the existing body of knowledge and point researchers in the direction of promising new areas of investigation,such as real-time inspection systems and multispectral imaging.This review,on its whole,offers a complete study of computer vision approaches for quality control in antenna parts.It does so by providing helpful insights and drawing attention to areas that require additional exploration.

SURFACE OIL FLOW TECHNIQUE AND LIQUID CRYSTAL THERMOGRAPHY FOR FLOW VISUALIZATION IN IMPULSE WIND TUNNELS

This paper describes flow visualization techniques employing surface oil flow and liquid crystal thermography suitable for use in impulse wind tunnels.High spatial resolution photographs of oil flow patterns and liquid crystal thermograms have been obtained within test times ranging from 7 to 500 ms and have been shown to be very useful for revealing the detailed features of 3-D separated flow.The results from oil flow patterns,liquid crystal thermograms,schlieren photographs and heat flux measurements are shown to be in good agreement.

Visualization Techniques in Smart Grid

Visualization is an established methodology in scientific computing. It has been used in many fields because of its strong capability in large data management and information display. However, its applications in power systems, especially in Smart Grid are still in infancy stage. Besides, while there were a lot of researches working on visualizing data in transmission power system, the study on displaying distribution power system data was limited. Therefore, in this paper, author proposed some techniques to visualize the Smart Grid data at distribution. They are classified in three categories, which are low dimensional techniques, multivariate high dimensional techniques and Geographical Information System (GIS) techniques.

Visual outcome of manual small-incision cataract surgery:comparison of modified Blumenthal and Ruit techniques

AIM:To compare the efficacy and visual results of the modified Blumenthal and Ruit techniques for manual small-incision cataract surgery(MSICS).· METHODS:This was a prospective,non-randomized comparison of 129 patients with senile cataracts scheduled to undergo routine cataract surgery via either a superior scleral tunnel incision,i.e.,the Blumenthal technique(group 1,n = 64) or a temporal scleral tunnel incision,i.e.,the Ruit technique(group 2,n =65).MSICS and intraocular lens implantation were performed through an unsutured 6.5-to 7.0-mm scleral tunnel incision.Uncorrected and corrected visual acuity,intraoperative and postoperative complications,and surgically induced astigmatism calculated by simple subtraction were compared.Patients were examined at 1 day,1 week,1 month,and 3 months after surgery.· RESULTS:Both groups achieved good visual outcome with minor complications.Three months after surgery,the corrected visual acuity was 0.73 in the Blumenthal group and 0.69 in the Ruit group(P =0.29).The average(SD) postoperative astigmatism was 0.87(0.62) diopter(D) for the Blumenthal group and 0.86(0.62) D for the Ruit group.The mean(SD) surgically induced astigmatism was 0.55(0.45) D and 0.50(0.44) D for the Blumenthal and Ruit groups,respectively(P =0.52).Common complications were minimal hyphema and corneal edema.There was no statistically significant difference in the complication rate between the groups(P >0.05).· CONCLUSION:In MSICS,both the Blumenthal and Ruit techniques achieved good visual outcomes,with low complication rates.

Application of the painless technique for visual induced abortion in early pregnancy clinic female

Objective: This project is to analyze and evaluate the efYect of the painless technique in the visual induced abortion. Methods: 300 pregnant women who needed induced abortion and had no contraindication were selected as the research objects. Under the condition of the informed consent of the pregnant women, they were divided into two groups according to the different methods of the induced abortion. 150 cases in the observation group were treated with the painless technique for visual abortion, and 150 cases in the control group were treated with the painless technique for the blind curettage. Relevant surgical indicators and complications were compared between the two groups. Results: The operation time, the vaginal bleeding time, the induced abortion syndrome, the uterine aspiration incompleteness, and the postoperative infection in the observation group were significantly lower than those in the control group. The difference between the two groups was significant (P 0.05), with the statistical significance. The incidence of complications in the observation group (8.33%) was significantly lower than that in the control group (37.50%). The difference between the two groups was significant (P 0.05), with the statistical significance. Conclusion: The visual induced abortion with the painless technique is of great value in the outpatient induced abortion, and it is worth adopting and applying.

3D visualization of the material flow in friction stir welding process

The material flow in friction stir welded 2014 Al alloy has been investigated using a marker insert technique （MIT）. Results of the flow visualization show that the material flow is asymmetrical during the friction stir welding （FSW） process and there are also significant differences in the flow patterns observed on advancing side and retreating side. On advancing side, some material transport forward and some move backward, but on retreating side, material only transport backward. At the top surface of the weld, significant material transport forward due to the action of the rotating tool shoulder. Combining the data from all the markers, a three-dituensional flow visualization, similar to the 3D image reconstruction technique, was obtained. The three-dimensional plot gives the tendency chart of material flow in friction stir welding process and from the plot it can be seen that there is a vertical, circular motion around the longitudinal axis of the weld. On the advancing side of the weld, the material is pushed downward but on the retreating side, the material is pushed toward the crown of the weld. The net result of the two relative motions in both side of the advancing and the retreating is that a circular motion comes into being. Comparatively, the material flow around the longitudinal axis is a secondary motion.

Using Speech Recognition in Learning Primary School Mathematics via Explain, Instruct and Facilitate Techniques

The application of Information and Communication Technologies has transformed traditional Teaching and Learning in the past decade to computerized-based era. This evolution has resulted from the emergence of the digital system and has greatly impacted on the global education and socio-cultural development. Multimedia has been absorbed into the education sector for producing a new learning concept and a combination of educational and entertainment approach. This research is concerned with the application of Window Speech Recognition and Microsoft Visual Basic 2008 Integrated/Interactive Development Environment in Multimedia-Assisted Courseware prototype development for Primary School Mathematics contents, namely, single digits and the addition. The Teaching and Learning techniques—Explain, Instruct and Facilitate are proposed and these could be viewed as instructors’ centered strategy, instructors’—learners’ dual communication and learners' active participation. The prototype is called M-EIF and deployed only users' voices;hence the activation of Window Speech Recognition is required prior to a test run.

GPU Accelerated Marine Data Visualization Method

The study of marine data visualization is of great value. Marine data, due to its large scale, random variation and multiresolution in nature, are hard to be visualized and analyzed. Nowadays, constructing an ocean model and visualizing model results have become some of the most important research topics of ‘Digital Ocean'. In this paper, a spherical ray casting method is developed to improve the traditional ray-casting algorithm and to make efficient use of GPUs. Aiming at the ocean current data, a 3D view-dependent line integral convolution method is used, in which the spatial frequency is adapted according to the distance from a camera. The study is based on a 3D virtual reality and visualization engine, namely the VV-Ocean. Some interactive operations are also provided to highlight the interesting structures and the characteristics of volumetric data. Finally, the marine data gathered in the East China Sea are displayed and analyzed. The results show that the method meets the requirements of real-time and interactive rendering.

VISUALIZATION AND MEASUREMENT OF VORTEX FLOW IN SPINNING SHELL-CASE

The characteristics of a flow in spinning devices are one of the fundamental problems innew-type spinning.In this paper the vortex flow in interior of the shell-case was studied by usingexperimental methods,which include flow visualization and laser doppler techniques.The flow sur-vey by measurement has been compared with that photographed by flow visualization method,andshows a fairly good conformity.The results of experiments are similar to those by numericalevaluation.

Speckle-interferometric Study of Close Visual Binary System HIP 11253(HD 14874)using Gaia(DR2 and EDR3)

We present a comprehensive set of physical and geometrical parameters for each of the components of the close visual binary system HIP 11253(HD 14874).We present an analysis for the binary and multiple stellar systems with the aim to obtain a match between the overall observational spectral energy distribution of the system and the spectral synthesis created from model atmospheres using Al-Wardat's method for analyzing binary and multiple stellar systems.The epoch positions are used to determine the orbital parameters and the total mass.The parameters of both components are derived as:T_(eff)^(a)=6025,T_(eff)^(b)=4710,logg_(a)=4.55,logg_(b)=4.60,R_(a)=1.125 R_(⊙),R_(b)=0.88R_(⊙),L_(a)=1.849 L_(⊙),L_(b)=0.342 L_(⊙).Our analysis shows that the spectral types of the components are F9 and K3.By combining the orbital solution with the parallax measurements of Gaia DR2 and EDR3,we estimate the individual masses using the H-R diagram as M_(a)=1.09 M_(⊙)and M_(b)=0.59 M_(⊙)for using Gaia DR2 parallax and M_(a)=1.10 M_(⊙)and M_(b)=0.61 M_(⊙)for using Gaia EDR3 parallax.Finally,the location of both system's components on the stellar evolutionary tracks is presented.

The Efficiency of the Moire Technique for Three-Dimensional Measures of Grape Bunches

This study was carried out in the University of Campinas to study the three-dimensional reconstruction of grape bunches through the application of the Moire technique as an alternative and innovative method, using low-cost equipment for data acquisition. This study proposed the three-dimensional visualization of grapes and topography on Xi axes through the Moire projection technique. The artificial grapes with a 20 cm long bunch and 18.45 mm average diameter for each grape were used. A projector was used to generate a grid with light and dark lines. The grape bunch was placed on a holder, illuminated by a sinusoidal grid and photographed. After processing the images, a three-dimensional map of the fruit and topography on Xi axes were obtained. The three-dimensional fruit observation allows the visualization of the higher and lower regions of the three-dimensional configuration through a color map. This result makes it possible to obtain size and shape of the grape bunch, allowing for the process automation of product selection and classification.

Visualizing Need: Using Data Visualization as a Decision Support Tool in the Formulation of Social Policy

International social work is facing an exponentially growing number of critical challenges in developing nations in meeting essential social needs as well as the distribution of material goods, social and economic resources and the provision, and effective services delivery to populations of need. There is a need to respond rapidly to populations in need and adapt to quickly changing socio-economic conditions. However, the resources needed to evaluate data and make effective decisions to provide support are often limited by the availability of trained data analysts who can interpret statistical findings and make relevant service delivery decisions for such communities of need. Modern computing technology shows promise of providing a graphical evaluation approach to enriching understanding of the available information. Thereby, the need to make critical decisions is augmented for those decision-makers that are working most closely with marginalized groups. A recent research effort undertaken by the Adventist Development and Relief Agency (ADRA) sought to provide administrators and policy-makers with information regarding the associations between social capital, economic development, and food security in the mountain region of Perú. Survey data collection and descriptive statistical analysis were used to provide information on the relationship between socio-economic development services and the emergence of social capital needed to develop effective human self-support systems. This paper demonstrates how to provide a graphical interface between areas of economic need and development initiatives. A visual exploration of data patterns would serve to inform human service decision-makers as they develop policies and programs. Visualization of data helps to enrich meaning and understanding of core areas of population need. This enhanced information format can identify needs for social policy development and improve the delivery of critical services and resources. This paper will provide a conceptual argument for considering data visualization methods in the evaluation of significant needs for, at risk, international populations. The paper will also present a number of examples for improving data evaluation and the understanding of need through data visualization methods through widely available computing technology. Procedures for graphically representing data will be demonstrated using the Perú survey, and applications for social policy formulation will be discussed.

Multicolor^(19)F magnetic resonance imaging:A promising medical technique for in vivo visualization of multiple biological targets

Driven by the needs of precision medicine,current imaging techniques are under continuous development to offer more accurate and comprehensive information beyond traditional macroscopic anatomical images.Multispectral color-coded(multicolor)^(19)F magnetic resonance imaging(MRI)is receiving increasing attention owing to its capability for visualizing quantitative and multiplexed molecular information during various biological processes.The chemical design and preparation of^(19)F probes lie at the core of multicolor^(19)F MRI since their performance dominates the accomplishment of this technique.Herein,the working principles of multicolor^(19)F MRI are briefly introduced.Recent progress on multicolor^(19)F MRI probes for simultaneous in vivo visualization of multiple biological targets is summarized.Finally,current challenges and potential solutions in this fast-developing field are discussed.

传统文化视觉设计数字化、动态化的实现路径

分析动态视觉设计和传统文化的动态视觉设计元素,进一步研究动态视觉设计中传统文化的表现手法,提出了传统文化视觉设计向数字化、动态化实现的具体策略,旨在为传统文化的现代化传承与创新提供新的思路与方法。

用于眼底成像的双光楔裂像电控调焦系统

为了实现眼底成像时的精准调焦,设计了双光楔裂像电控调焦系统。采用905 nm近红外半导体激光经双光楔和矩形狭缝在视网膜上形成矩形视标的方法,通过电机控制视度补偿镜和双光楔机构移动,得出视度补偿镜和双光楔位移关联关系;根据矩形视标分离情况实时反馈离焦补偿状态,指导控制系统移动双光楔和视度补偿镜,实现眼底成像时的准确调焦,在模拟眼上开展了眼底成像调焦实验。结果表明,系统可实现-10 m^(-1)~10 m^(-1)屈光度补偿,调焦精度在1 m^(-1)以上。该双光楔裂像电控调焦系统调焦速度快、精度高,为发展自动眼底成像仪器提供了基础。

宽工作范围诱导轮空化不稳定及抑制

涡轮泵是液体火箭发动机的心脏,在特定工况下其内部会发生空化不稳定现象,导致涡轮泵振动量级大幅增加,严重影响发动机整机工作可靠性.以决定涡轮泵抗空化能力的关键部件诱导轮为研究对象,利用空化可视化实验和数值仿真对其内部空化流动特性进行深入分析,获得60%~120%设计点流量范围完整空化性能曲线,提出一种基于壳体改进的旋转空化抑制措施,并揭示抑制机理.结果表明:该型诱导轮抗空化能力随流量降低逐渐增强,空化首先发生在泄漏涡中,随空化数降低,泄漏涡空化逐渐沿吸力面向下游发展,影响相邻叶片冲角,在小流量范围诱发显著的1.2倍叶轮转频超同步旋转空化现象,直至空化延伸至叶片流道出口,导致扬程断裂;在叶尖前缘壳体设置台阶不会影响诱导轮稳态空化性能,但会改变泄漏涡空化的发展规律,使其呈现向上游摆动的趋势,削弱对相邻叶片冲角的影响,实现对全流量范围旋转空化的有效抑制.文章研究对于降低涡轮泵振动量级,进一步提升液体火箭发动机工作可靠性有一定指导意义.

基于文献计量学和可视化技术的抗栓治疗危险因素分析

目的分析国内外抗栓治疗(抗血小板治疗和抗凝治疗,即抗栓的药物治疗)危险因素的现状和特点,为防治抗栓治疗引起的血栓或出血提供理论依据。方法检索2011年1月至2021年11月期间发表在中文数据库(中国期刊全文数据、万方数据库、维普数据库)以及英文数据库(PubMed、Web of science、MEDLINE)有关抗栓治疗危险因素的相关文献,进行文献计量学分析并使用VOSviewer软件进行可视化分析。结果共纳入595篇文献,英文文献发表量前三的国家分别为美国、中国和日本。研究类型以队列研究为主,样本数量大多在1000例以内。抗栓治疗危险因素分为影响抗血小板药物、华法林以及新型口服抗凝药治疗的危险因素。年龄、性别、肾功能、抗栓药物的联用等是共同的危险因素,不同的抗栓药物的危险因素也有其自身特点。结论国内外抗栓治疗危险因素的研究数量较多但样本量有待增加。药师应基于不同药物和不同人群进行个体化用药服务,保障患者的用药安全。

基于Web of Science的挥发性有机化合物无创诊断肿瘤文献计量与可视化分析

目的对近20年使用挥发性有机化合物(VOCs)进行肿瘤无创诊断的研究展开文献计量及可视化分析,总结其研究现状、不足及发展趋势,为未来临床实施应用提供参考。方法以“neoplasia”和“volatile organic compound”为共同主题,采用主题词和自由词结合的方式,检索2002年1月1日至2022年10月26日发表在Web of Science核心合集数据库的VOCs无创诊断肿瘤相关研究,通过Citespace和VOSviewer软件生成知识图谱,对年度出版物、国家、作者机构、出版物、参考文献及关键词进行可视化分析。结果经检索共纳入641项研究,年度发文量整体呈上升趋势。“肺癌”“呼出气”一直是该领域核心组成部分;传感器检测技术在更多癌症中应用和发展,以及探索潜在特异性生物标志物成为新的研究趋势。结论利用VOCs进行肿瘤无创诊断将继续成为一个活跃的研究领域,但追求创新的同时,还需考虑实际需求,如果没有统一的操作标准,不是特定癌种可靠且可重复的生物标志物群,VOCs的临床应用依然会受到极大限制。

可持续视域的国内扎染技艺研究进展

在可持续发展背景下,分析国内扎染技艺研究的热点和前沿动态。基于文献计量方法,进行中国知网(CNKI)检索。以中文核心期刊及高被引文文献共373篇为研究对象,运用文献计量软件绘制作者和机构合作、关键词共现、发展脉络等知识基础构建科学知识图谱,并进行网络可视化分析。结果表明:2023年,国内扎染技艺研究呈缓慢上升趋势;研究作者和机构呈现较为松散式分布,且尚未形成较为密集的合作共同体;扎染是该研究领域相关学者较为关注的热点话题,可为可持续设计的传统扎染技艺理论研究和实践提供一定参考和启示。

基于Visual Basic6.0的AutoCAD图形数据交互技术

介绍了利用 Visual Basic6.0的强大功能 ,对 Auto CAD进行二次开发 ,提取图形对象数据 ,来修改图形对象 .此方法运用于船舶设计中 ,通过修改船体型线来满足设计者的要求 .同时作者也提出了该方法对船舶性能计算的实用性 ,为人机交互式地进行船舶设计提供了简易、快捷、有效的方法和途径 .