scholarly journals Vision Measurement of Gear Pitting Under Different Scenes by Deep Mask R-CNN

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4298
Author(s):  
Dejun Xi ◽  
Yi Qin ◽  
Yangyang Wang
Keyword(s):  
Quantitative Measurement ◽  
Measurement Accuracy ◽  
Tooth Surface ◽  
Vision Measurement ◽  
Multi Level ◽  
New Vision ◽  
Vision Detection ◽  
Sample Set ◽  
Different Levels ◽  
Measurement Approach

To accurately and quantitatively detect the gear pitting of different levels on the actual site, this paper studies a new vision measurement approach based on a tunable vision detection platform and the mask region-based convolutional neural network (Mask R-CNN). The shooting angle can be properly set according to the specification of the target gear. With the obtained sample set of 1500 gear pitting images, an optimized deep Mask R-CNN was designed for the quantitative measurement of gear pitting. The effective tooth surface and pitting was firstly and simultaneously recognized, then they were segmented to calculate the pitting area ratio. Considering three situations of multi-level pitting, multi-illumination, and multi-angle, several indexes were used to evaluate detection and segmentation results of deep Mask R-CNN. Experimental results show that the proposed method has higher measurement accuracy than the traditional method based on image processing, thus it has significant practical potential.

scholarly journals A new vision measurement method based on active object gazing

2017 ◽  
Vol 14 (4) ◽  
pp. 172988141771598 ◽  
Author(s):  
De Xu ◽  
Qingbin Wang
Keyword(s):  
Measurement Method ◽  
Measurement Accuracy ◽  
Rotation Angle ◽  
Vision System ◽  
Three Dimensional ◽  
Active Object ◽  
Intrinsic Parameters ◽  
Vision Measurement ◽  
Cartesian Space ◽  
New Vision

A new vision measurement system is developed with two cameras. One is fixed in pose to serve as a monitor camera. It finds and tracks objects in image space. The other is actively rotated to track the object in Cartesian space, working as an active object-gazing camera. The intrinsic parameters of the monitor camera are calibrated. The view angle corresponding to the object is calculated from the object’s image coordinates and the camera’s intrinsic parameters. The rotation angle of the object-gazing camera is measured with an encoder. The object’s depth is computed with the rotation angle and the view angle. Then the object’s three-dimensional position is obtained with its depth and normalized imaging coordinates. The error analysis is provided to assess the measurement accuracy. The experimental results verify the effectiveness of the proposed vision system and measurement method.

The Logical and Compositional Organization of the Lecture (Based on a Lecture from M. Mamardashvili’s Course “Lectures on Proust”)

2020 ◽  
pp. 72-81
Author(s):  
Aleksandra A. Talanina ◽  
Keyword(s):  
Academic Discourse ◽  
Basic Function ◽  
Literary Language ◽  
Linguistic Features ◽  
Specific Nature ◽  
Teaching Process ◽  
Discourse Studies ◽  
Multi Level ◽  
Spatiotemporal Coordination ◽  
Different Levels

Functional and stylistic studies give us an idea of linguistic features of speech products, thus enabling style identification. These specific features become most recognizable when comparing styles. Discourse studies, on the contrary, are mainly focused on understanding and describing basic factors of creating a form of a literary language (style) and factors that determine the characteristics of speech products in individual situations within a socially significant sphere. This article presents an analysis of the logical and compositional organization of the lecture as a genre of academic discourse, taking a university lecture from M. Mamardashvili’s course on M. Proust as an example. The specific nature of the lecture genre in academic discourse is determined by its basic function in the teaching process implemented in direct dialogue with the audience. The research is based on the thesis that a lecture is an event that can be analysed using the concept of chronotope. The use of this concept beyond the analysis of fiction is relevant since spatiotemporal coordination is mandatory for any speech product, regardless of the sphere it is created in or the functions it performs. The main feature of the lecture chronotope is multi-level organization, since a lecture has its own internal spatiotemporal coordinates. The lecture chronotope is explicated at different levels of the text (compositional, lexical and grammatical), which are interconnected. Considering this, two interconnected frameworks of the lecture – structural and semantic – are singled out; they provide the logical and compositional organization of the material, which is important to ensure students’ understanding.

Turnout in Multi-Level Systems

2017 ◽  
Author(s):  
Sona N. Golder ◽  
Ignacio Lago ◽  
André Blais ◽  
Elisabeth Gidengil ◽  
Thomas Gschwend
Keyword(s):  
National Level ◽  
The Body ◽  
Political Community ◽  
The Political ◽  
European Level ◽  
National Elections ◽  
Political Issues ◽  
European Elections ◽  
Multi Level ◽  
Different Levels

Voters face different incentives to turn out to vote in one electoral arena versus another. Although turnout is lowest in European elections, it is found that the turnout is only slightly lower in regional than in national elections. Standard accounts suggest that the importance of an election, in terms of the policy-making power of the body to be elected, drives variation in turnout across elections at different levels. This chapter argues that this is only part of the story, and that voter attachment to a particular level also matters. Not all voters feel connected to each electoral arena in the same way. Although for some, their identity and the issues they most care about are linked to politics at the national level, for others, the regional or European level may offer the political community and political issues that most resonate with them.

Parties, Voters, and Multi-Level Elections

2017 ◽  
Author(s):  
Sona N. Golder ◽  
Ignacio Lago ◽  
André Blais ◽  
Elisabeth Gidengil ◽  
Thomas Gschwend
Keyword(s):  
Political Parties ◽  
Driving Force ◽  
Party System ◽  
Voting Behaviour ◽  
Electoral Institutions ◽  
Multi Level ◽  
Different Levels

This chapter argues that individual voting behaviour and the strategies chosen by political parties across multiple electoral arenas should be considered jointly. Existing literature points to the importance of an election as a major driving force in voting behaviour, but it is argued that voters and parties may differ in their assessments of the importance of elections at different levels. The chapter discusses how the effect of the importance of an electoral arena, for both voter and party behaviour, will be conditioned by electoral institutions and characteristics of parties and the party system, in addition to individual voter characteristics contributing to it.

Contradictions of the upcoming period: points for developing the agenda for medium- and long-term perspective

2021 ◽  
pp. 72-80
Author(s):  
D.M. Belousov ◽  
Keyword(s):  
Social Order ◽  
Social Situation ◽  
Regional Conflicts ◽  
Global Nature ◽  
Multi Level ◽  
Object Of Control ◽  
Trade Wars ◽  
New Social Order ◽  
Different Levels

Analysis of the economic and social situation allows for the conclusion that the world is entering an era of global instability and contradictions. There is clearly a crisis of compensatory and basic institutions. Humans cease to be the subjects of the historical process and instead are becoming the object of control. Contradictions are sharply increasing at different levels. We are witnessing the conflict between labor and capital related to the national nature of labor and the global nature of capital. Production, security and regional applied science are changing, but financial and institutional systems remain global. Information and trade wars are intensifying. During a multi-level crisis, it is difficult to predict what a new social order will be like, but the transition to it will be difficult and highly possibly rife with (macro-) regional conflicts.

scholarly journals A Novel Vision-Based Pose Measurement Method Considering the Refraction of Light

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4348 ◽  
Author(s):  
Wei Liu ◽  
Xin Ma ◽  
Xiao Li ◽  
Yi Pan ◽  
Fuji Wang ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
High Speed ◽  
Measurement Accuracy ◽  
Performance Testing ◽  
Angle Measurement ◽  
Normal Vector ◽  
Calibration Model ◽  
Linear Calibration ◽  
Observation Window ◽  
Vision Measurement

Nowadays, due to the advantages of non-contact and high-speed, vision-based pose measurements have been widely used for aircraft performance testing in a wind tunnel. However, usually glass ports are used to protect cameras against the high-speed airflow influence, which will lead to a big measurement error. In this paper, to further improve the vision-based pose measurement accuracy, an imaging model which considers the refraction light of the observation window was proposed. In this method, a nonlinear camera calibration model considering the refraction brought by the wind tunnel observation window, was established first. What’s more, a new method for the linear calibration of the normal vector of the glass observation window was presented. Then, combining with the proposed matching method based on coplanarity constraint, the six pose parameters of the falling target could be calculated. Finally, the experimental setup was established to conduct the pose measurement study in the laboratory, and the results satisfied the application requirements. Besides, experiments for verifying the vision measurement accuracy were also performed, and the results indicated that the displacement and angle measurement accuracy approximately increased by 57% and 33.6%, respectively, which showed the high accuracy of the proposed method.

Block Thickness Measurement of Using the Structured Light Vision

2018 ◽  
Vol 33 (01) ◽  
pp. 1955001 ◽  
Author(s):  
Fenghui Lian ◽  
Qingchang Tan ◽  
Siyuan Liu
Keyword(s):  
Machine Vision ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Thickness Measurement ◽  
Base Plane ◽  
Vision Measurement ◽  
Measurement Results ◽  
Measurement Equations ◽  
Structured Light Vision ◽  
Measuring Base

A method for measuring block thicknesses is proposed by the machine vision measurement. Equations of the measuring base plane and the light plane are formed by calibration. Then, the equation of the light strip image, that is, the image of the intersection between the base plane and light one, is established by the projection relation. Equation of the image of the light strip on the measured plane can be determined by the fitting. Since the light strip on the measuring base plane is parallel to one on the measured plane, the thickness of the measuring block is measured by using the two equations. The experiment evaluates the measurement accuracy of the measurement method and analyzes the influence of some factors on the measurement results.

An Accurate and Efficient Vision Measurement Approach for Railway Catenary Geometry Parameters

2018 ◽  
Vol 67 (12) ◽  
pp. 2841-2853 ◽  
Author(s):  
Dong Zhan ◽  
Deyan Jing ◽  
Mingli Wu ◽  
Dongkai Zhang ◽  
Long Yu ◽  
...  
Keyword(s):  
Vision Measurement ◽  
Measurement Approach

scholarly journals Towards an interdisciplinary science of the subjective experience of remembering

2019 ◽  
Author(s):  
Jon Simons ◽  
Kaja Julia Mitrenga ◽  
Charles Fernyhough
Keyword(s):  
Subjective Experience ◽  
Cultural Factors ◽  
Levels Of Analysis ◽  
Interdisciplinary Science ◽  
Arts And Humanities ◽  
The Arts ◽  
Research Questions ◽  
Multi Level ◽  
Social And Cultural Factors ◽  
Different Levels

Some of the most interesting advances in the study of episodic memory have come from considering different levels of analysis. In this article, we focus on how insights from multiple disciplines can inform understanding of the subjective experience of remembering. For example, we highlight how inspiration from the arts and humanities can generate novel research questions that can elucidate the cognitive and brain mechanisms responsible for what it feels like to remember a previous experience. We also consider how a multi-level perspective can help to address some confusions in the literature, such as between reconsolidation and reconstruction, and how a full understanding of memory requires appreciation of social and cultural factors.

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