Search results for "Computer Vision"

A cooperative mobile robot and manipulator system (Co-MRMS) for transport and lay-up of fibre plies in modern composite material manufacture

2021

AbstractComposite materials are widely used in industry due to their light weight and specific performance. Currently, composite manufacturing mainly relies on manual labour and individual skills, especially in transport and lay-up processes, which are time consuming and prone to errors. As part of a preliminary investigation into the feasibility of deploying autonomous robotics for composite manufacturing, this paper presents a case study that investigates a cooperative mobile robot and manipulator system (Co-MRMS) for material transport and composite lay-up, which mainly comprises a mobile robot, a fixed-base manipulator and a machine vision sub-system. In the proposed system, marker-base…

Comprehensive simulation of cooperative robotic system for advanced composite manufacturing : a case study

2021

Composite materials are widely used because of their light weight and high strength properties. They are typically made up of multi-directional layers of high strength fibres, connected by a resin. The manufacturing of composite parts is complex, time-consuming and prone to errors. This work investigates the use of robotics in the field of composite material manufacturing, which has not been well investigated to date (particularly in simulation). Effective autonomous material transportation, accurate localization and limited material deformation during robotic grasping are required for optimum placement and lay-up. In this paper, a simulation of a proposed cooperative robotic system, which …

New method of grain-boundary extraction by directional optimal filtering: application to estimating creep in metals

2002

It is economically important for manufacturers of high- temperature machines to be able to measure creep so they can predict residual service life more accurately. This paper describes and refines an image analysis method for evaluating creep in laboratory test pieces. It is a preliminary study of how to extract relevant information for creep mea- surement by counting cavities. Sample preparation for quantification by image analysis is an important step determining the further development of the image analysis technique. Grain-boundary extraction, which in- volves directional information, is the major problem to be solved before measurement can be automated. The search for a crest-line extr…

New, fast, and accurate procedure to calibrate a 2-dimensional digital measurement method.

2005

Traditionally, dental casts have been measured by hand, with conventional calipers. Today, several digital methods are available for automatically measuring tooth size, but their accuracy depends on proper calibration. The purpose of this article is to introduce a fast and accurate procedure to calibrate a previously introduced 2-dimensional computerized system of measuring mesiodistal tooth size and calculating overall and anterior Bolton ratios. In this calibration method, the cast is digitized while sitting on a sheet of graph paper. The magnification of the paper in 2 axes can be easily calculated and hence the magnification of the dental cast digital image.

Towards farm-level health management of offshore wind farms for maintenance improvements

2015

This paper studies a conceptual architecture for health management of offshore wind farms. To this aim, various necessary enablers of a health management sys- tem are presented to improve reliability and availability while optimizing maintenance costs. The main focus lies on improving existing condition monitoring systems based on concepts of condition-based maintenance and relia- bility centered maintenance. A brief review of the rel- evant state-of-the-art is presented and gaps to be filled towards realization of such health management system are discussed.

A new perspective on CMS – testing the effect of camera displacement in a realistic lane-change task

2020

FIR Kramers–Kronig transformers for relaxation data conversion

2006

It is shown that relaxation data conversion by the Kramers-Kronig (KK) relations can be treated as a filtering problem of band-unlimited relaxation signals in the Mellin transform domain. Based on this concept, KK relations are implemented in the form of FIR filters with the logarithmic sampling. It is demonstrated that KK transformers have sampling rate dependent impulse and frequency responses and only calculation of the imaginary part from the real part can be implemented by a computationally realisable filter. The performance of different types of transformers is studied.Approximately inversely proportional relationship is established between the error and the frequency range of input s…

Leaping across Modalities: Speed Regulation Messages in Audio and Tactile Domains

2010

This study examines three design bases for speed regulation messages by testing their ability to function across modalities. Two of the design bases utilise a method originally intended for sound design and the third uses a method meant for tactile feedback. According to the experimental results, all designs communicate the intended meanings similarly in audio and tactile domains. It was also found that melodic (frequency changes) and rhythmic (segmentation) features of stimuli function differently for each type of message.

Integration of different cardiac electrophysiological models into a single simulation pipeline

2012

Clinical translation of computational models of the heart has been hampered by the absence of complete and rigorous technical and clinical validation, as well as benchmarking of the developed tools. To address this issue, a dataset containing the cardiac anatomy and fibre orientations from magnetic resonance images (MRI), as well as epicardial transmembrane potentials from optical mapping acquired on ex-vivo porcine hearts, have previously been made available to the community. Image processing techniques were developed to integrate MRI images with electrical information. Different models were tested and compared with the integrated data1, including: i) a new methodology to customize and reg…

Agency and Presence: A Common Dependence on Subjectivity?

2006

This paper argues that presence, as shown in virtual environments, can usefully be seen as comprising various subtypes and that these in turn may have common conceptual and ontological features with a sense of agency as defined by Russell (1996, Agency: Its Role in Mental Development, Erlbaum.). Furthermore, an analysis of Russell's characterization of the concept of agency may be useful for acquiring insight into the sense of presence itself and the variables affecting it. Empirical evidence from cognitive developmental research and the positive results of attempts to develop symbolic understanding in people with autism spectrum disorders (ASD) in virtual environments suggest that presenc…