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Ovarian Structures Detection using Convolutional Neural Networks

Procedia computer Science 2022年 196卷 542-549页

作者： Diego Wanderley Carlos Ferreira Aurélio Campilho Jorge Silva Faculty of Engineering of the University of Porto (FEUP) Porto Portugal Institute for Systems and Computer Engineering Technology and Science (INESC TEC) Porto Portugal

The detection of ovarian structures from ultrasound images is an important task in gynecological and reproductive medicine. An automatic detection system of ovarian structures can work as a second opinion for less experienced physicians or complex ultrasound interpretations. This work presents a study of three popular CNN-based object detectors applied to the detection of healthy ovarian structures, namely ovary and follicles, in B-mode ultrasound images. The Faster R-CNN presented the best results, with a precision of 95.5% and a recall of 94.7% for both classes, being able to detect all the ovaries correctly. The RetinaNet showed competitive results, exceeding 90% of precision and recall. Despite being very fast and suitable for real-time applications, YOLOv3 was ineffective in detecting ovaries and had the worst results detecting follicles. We also compare CNN results with classical computer vision methods presented in the ovarian follicle detection literature.

关键词： follicle detection ovary detection ovarian structures gynecological ultrasound convolutional neural networks

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Thermographic and visible spectrum camera calibration for marine robotic target detection

Thermographic and visible spectrum camera calibration for ma...

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作者： André Dias Carlos Brás Alfredo Martins José Almeida Eduardo Silva INESC TEC Institute for Systems and Computer Engineering of Porto Porto Polytechnic Institute Porto Portugal

ISBN: (纸本)9781479913084

In the context of detection, location and tracking of human targets with combination of thermographic and visible cameras, this paper addresses the problem of geometric calibration of thermographic and visible spectrum cameras necessary for the stereo perception of targets in the robot frame. A method for precise geometric calibration of thermographic and visible cameras in the autonomous surface vehicle (ASV) ROAZ II is presented. The method combine the utilization of special patterns for intrinsic calibration of thermographic cameras, with the usage of a high-resolution 3D laser scanner for the extrinsic calibration, relating the cameras frames with the robot frame. Calibration process results are presented and analyzed.

关键词： Cameras Calibration Robot vision systems Three-dimensional displays Vehicles Lasers

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Groundtruth system for underwater benchmarking

Groundtruth system for underwater benchmarking

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作者： Alfredo Martins André Dias Hugo Silva José Almeida Pedro Gonçalves Flávio Lopes André Faria João Ribeiro Eduardo Silva INESC TEC Institute for Systems and Computer Engineering of Porto Porto Polytechnic Institute Porto Portugal

In this paper a vision based groundtruth system for underwater applications is presented. The proposed system as an external validation perception and localization mechanism for underwater trials in the inesc tec / IS... 详细信息

ISBN: (纸本)9781479913084

关键词： Cameras Vehicles Image color analysis Robots Synchronization Calibration Three-dimensional displays

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A Simulation-Based Approach to Reduce Waiting Times in Emergency Departments 2nd

A Simulation-Based Approach to Reduce Waiting Times in Eme...

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2nd International Scientific Conference on Innovation in engineering, ICIE 2022

作者： Teymourifar, Aydin CEGE - Centro de Estudos em Gestão e Economia Católica Porto Business School Porto Portugal INESC TEC - Institute for Systems and Computer Engineering Technology and Science Porto Portugal

ISBN: (纸本)9783031093845

The goal of this work is to utilize a simulation model to reduce waiting times before examinations in emergency departments. Different types of arrivals to an emergency department, basic processes, and possible queues are explained. The implementation is conducted in the Rockwell Arena software and some related details are provided. The validity of the simulation model is demonstrated. Then scenarios are developed based on limited boosting of resources to reduce waiting times. It is analyzed how waiting times can be reduced. Also, it is discussed that which resources should be increased for this aim. The Process Analyzer software is used for the analysis of the scenarios, whose details are given. It is also analyzed how the utilization rate of resources changes in scenarios. Data from the literature are used for experimental results. Since the analyzes are based on generalizable approaches, they can be applied in similar emergency departments. The results show that with a reasonable increase in resources, it is possible to significantly reduce waiting times. The implications that may be useful in the management of emergency departments are presented. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Discrete event simulation

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Effect of xanthan gum on physicochemical and textural properties of gluten-free batter and bread 10

Effect of xanthan gum on physicochemical and textural proper...

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10th International Conference on Simulation and Modelling in the Food and Bio-Industry, FOODSIM 2018

作者： Encina-Zelada, Christian R. Teixeira, José A. Monteiro, Fernando Gonzales-Barron, Ursula Cadavez, Vasco Centre of Biological Engineering School of Engineering University of Minho Portugal Department of Electrical Engineering School of Technology and Management INESC-TEC Institute for Systems and Computer Engineering Technology and Science Porto Portugal CIMO Mountain Research Centre School of Agriculture Polytechnic Institute of Bragança Portugal

ISBN: (纸本)9789492859013

The objective of this study was to evaluate the effect of xanthan gum (XG) on physicochemical, rheological and textural properties of gluten-free batter and bread. Batches of gluten-free bread used a base formulation of rice, corn and quinoa flour, and different levels of XG (1.5, 2.5 and 3.5%) and water content (WC;90, 100 and 110%) in a full factorial design. Although in interaction with water, higher XG doses tended to produce batters of lower stickiness, work of adhesion, strength-cohesiveness;which, when baked, produced loaves of lower specific volume and baking loss;and bread crumb of lower Aw, pH, hardness, springiness, firmness, mean cell area, void fraction, mean cell aspect ratio, and higher firmness, consistency, cohesiveness, adhesiveness, chewiness, resilience, cell density, cell size uniformity and mean cell compactness (p © 2018 EUROSIS-ETI.

关键词： Aspect ratio

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Poster abstract: A harmony of sensors: Achieving determinism in multi-application sensor networks

Poster abstract: A harmony of sensors: Achieving determinism...

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13th IEEE/ACM International Conference on Information Processing in Sensor Networks, IPSN 2014

作者： Gupta, Vikram Tovar, Eduardo Pereira, Nuno Rajkumar, Ragunathan Raj CISTER/INESC-TEC Research Center ISEP Polytechnic Institute of Porto Portugal Electrical and Computer Engineering Carnegie Mellon University Pittsburgh United States

ISBN: (纸本)9781479931460

Several concurrent applications running on a sensor network may cause a node to transmit packets at distinct periods, which increases the radio-switching rate and has significant impact in terms of the overall energy consumption. We propose to batch the transmissions together by defining a harmonizing period to align the transmissions from multiple applications at periodic boundaries. This harmonizing period is then leveraged to design a distributed protocol called Network-Harmonized Scheduling (NHS) that coordinates transmissions across nodes and provides real-time guarantees in a multi-hop network. © 2014 IEEE.

关键词： Energy utilization

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Autonomous UAV Landing Approach for Marine Operations

Autonomous UAV Landing Approach for Marine Operations

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作者： André Moura José Antunes João J. Martins André Dias Alfredo Martins José M. Almeida Eduardo Silva Robotics and Autonomous Systems Institute for Systems and Computer Engineering Technology and Science (INESC TEC) Porto Portugal

The use of autonomous vehicles in maritime operations is a technological challenge. In the particular case of autonomous aerial vehicles (UAVs), their application ranges from inspection and surveillance of offshore power plants, and marine life observation, to search and rescue missions. Manually landing UAVs onboard water vessels can be very challenging due to limited space onboard and wave agitation. This paper proposes an autonomous solution for the task of landing commercial multicopter UAVs with onboard cameras on water vessels, based on the detection of a custom landing platform with computer vision techniques. The autonomous landing behavior was tested in real conditions, using a research vessel at sea, where the UAV was able to detect, locate, and safely land on top of the developed landing platform.

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Navigation Stack for Robots Working in Steep Slope Vineyard

Navigation Stack for Robots Working in Steep Slope Vineyard

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Intelligent systems Conference, IntelliSys 2020

作者： Santos, Luís C. Aguiar, André S. Santos, Filipe N. Valente, António Ventura, José Boa Sousa, Armando J. INESC TEC - Institute for Systems and Computer Engineering Technology and Science Porto Portugal UTAD - University of Trás-os-Montes e Alto Douro Vila Real Portugal FEUP - Faculty of Engineering of University of Porto Porto Portugal

ISBN: (纸本)9783030551797

Agricultural robotics is nowadays a complex, challenging, and relevant research topic for the sustainability of our society. Some agricultural environments present harsh conditions to robotics operability. In the case of steep-slope vineyards, there are several robotic challenges: terrain irregularities, characteristics of illumination, and inaccuracy/unavailability of the Global Navigation Satellite System. Under these conditions, robotics navigation, mapping, and localization become a challenging task. Performing these tasks with safety and accuracy, a reliable and advanced Navigation stack for robots working in a steep slope vineyard is required. This paper presents the integration of several robotic components, path planning aware of robot centre of gravity and terrain slope, occupation grid map extraction from satellite images, a localization and mapping procedure based on high-level visual features reliable under GNSS signals blockage/missing, for steep-slope robots. © 2021, Springer Nature Switzerland AG.

关键词： Mapping

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Deep Left Ventricular Motion Estimation Methods in Echocardiography: A Comparative Study

Deep Left Ventricular Motion Estimation Methods in Echocardi...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Sofia Ferraz Miguel Coimbra João Pedrosa Institute for Systems and Computer Engineering Technology and Science (INESC TEC) Faculty of Engineering of the University of Porto (FEUP) Porto Portugal Institute for Systems and Computer Engineering Technology and Science (INESC TEC) Faculty of Sciences of the University of Porto (FCUP) Porto Portugal

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

Motion estimation in echocardiography is critical when assessing heart function and calculating myocardial deformation indices. Nevertheless, there are limitations in clinical practice, particularly with regard to the accuracy and reliability of measurements retrieved from images. In this study, deep learning-based motion estimation architectures were used to determine the left ventricular longitudinal strain in echocardiography. Three motion estimation approaches, pretrained on popular optical flow datasets, were applied to a simulated echocardiographic dataset. Results show that PWC-Net, RAFT and FlowFormer achieved an average end point error of 0.20, 0.11 and 0.09 mm per frame, respectively. Additionally, global longitudinal strain was calculated from the FlowFormer outputs to assess strain correlation. Notably, there is variability in strain accuracy among different vendors. Thus, optical flow-based motion estimation has the potential to facilitate the use of strain imaging in clinical practice.

关键词： Training Accuracy Echocardiography Motion estimation Pipelines Noise Strain measurement Reliability Optical flow Strain

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Structured Light System for Underwater Inspection Operations

Structured Light System for Underwater Inspection Operations

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作者： Flávio Lopes Hugo Silva José Miguel Almeida Alfredo Martins Eduardo Silva INESC TEC Institute for Systems and Computer Engineering of Porto ISEP - School of Engineering Porto Polytechnic Institute Porto Portugal

ISBN: (纸本)9781479987375

In this work we propose the development of a stereo SLS system for underwater inspection operations. We demonstrate how to perform a SLS calibration both in dry and underwater environments using two different methods. The proposed methodology is able to achieve quite accurate results, lower than 1 mm in dry environments. We also display a 3D underwater scan of a known object size, a sea scallop, where the system is able to perform a scan with a global error lower than 2% of the object size.

关键词： Underwater vision system Camera Line laser Structured light system

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