scholarly journals BUSCA DE PALAVRAS CHAVE EM IMAGENS DE LIVROS IMPRESSOS USANDO VISÃO COMPUTACIONAL

2021 ◽  
Vol 13 (2) ◽  
pp. 25-35
Author(s):  
Felipe Peruchi Simões ◽  
Francisco Assis da Silva ◽  
Leandro Luiz de Almeida ◽  
Danillo Roberto Pereira ◽  
Mário Augusto Pazoti ◽  
...  
Keyword(s):  
Computer Vision ◽  
Computational Resource ◽  
Image Identification ◽  
Hit Rate ◽  
Frequent Use ◽  
Digital Format ◽  
People Search ◽  
Character Classification

With the increasingly frequent use of books in digital format, people search for the desired subjects in a faster way compared to the search in physical books. This work aimed to develop a computational resource in the form of an application for Android smartphones, which, based on an image captured from a page in a book, performs searches by keywords. The purpose of using the application is to help the reader to find the desired information quickly. We use Computer Vision techniques with the aid of the OpenCV library in the development of algorithms to perform segmentation, correction of the perspective of the book page image, identification and rectification of the wavy lines, recognition and character classification. The results shown were promising with a hit rate of over 88%.

scholarly journals Computer Vision Syndrome Prevalence and Ocular Sequelae among Medical Students: A University-Wide Study on a Marginalized Visual Security Issue

2021 ◽  
Vol 15 (1) ◽  
pp. 156-170
Author(s):  
Mohammed Iqbal ◽  
Hosam Elzembely ◽  
Ahmed Elmassry ◽  
Mervat Elgharieb ◽  
Ahmed Assaf ◽  
...  
Keyword(s):  
Computer Vision ◽  
Medical Students ◽  
Anterior Segment ◽  
Multivariate Logistic Regression Analysis ◽  
Risk Groups ◽  
Security Issue ◽  
Cross Sectional ◽  
Ophthalmic Examination ◽  
Frequent Use ◽  
Computer Vision Syndrome

Introduction: This study aimed to discover and document the potential of visual and ocular sequelae of computer vision syndrome (CVS) among medical students. Methods: This cross-sectional case-control study was conducted on medical students (n=4030) of five universities in Egypt. All students completed a specially designed and validated CVS questionnaire survey (CVS-F3). Students with ≥5 CVS symptoms constituted a risk group (n=352), while students with 1-4 CVS symptoms constituted a low-symptoms group (n=3067). Students from the control and risk groups were examined using objective methods, such as visual acuity, subjective refraction, dry eye disease tests, and anterior segment and fundus examinations. Students who complained of visual blur underwent multifocal electroretinography mfERG examinations (mfERG group). Results: The CVS-F3 indicated that 84.8% of students had complaints that might be related to CVS, however, our ophthalmic examination group revealed only a 56% CVS prevalence rate. The most common single screen type used by 70.4% of students was the smartphone, and the most common complaint was headache (50.2%). Multivariate logistic regression analysis revealed that CVS was significantly associated with increased screen-hours, including >2 screen-hours daily (odds ratio [OR], 2.48; P<0.0001), >2 screen-hours at night (OR, 1.79; P=0.003), and ≥3 screen-years (OR, 1.69; P=0.006). In the mfERG group, 37% demonstrated reduced amplitudes of mfERG rings and quadrants, indicating reduced foveal responses. Conclusion: CVS-questionnaires overestimate the true CVS prevalence and sequelae, which could be accurately detected by objective ophthalmic examination. Smartphones primarily caused CVS among students, with CVS severity increasing in correlation with shorter eye-to-screen distance and frequent use. Contact lens wearing doubled the risk of CVS development and augmented its severity. CVS might affect macular integrity with screen-induced foveal dysfunction. Clinical Trials Registration: PACTR201811618954630.

Construction, implementation and testing of an image identification system using computer vision methods for fruit flies with economic importance (Diptera: Tephritidae)

2016 ◽  
Vol 73 (7) ◽  
pp. 1511-1528 ◽  
Author(s):  
Jiang-ning Wang ◽  
Xiao-lin Chen ◽  
Xin-wen Hou ◽  
Li-bing Zhou ◽  
Chao-Dong Zhu ◽  
...  
Keyword(s):  
Computer Vision ◽  
Fruit Flies ◽  
Economic Importance ◽  
Identification System ◽  
Image Identification

scholarly journals SchottRoadmaptoVirtualFieldtripsFinal Project Report.pdf

2020 ◽  
Author(s):  
Christian Schott
Keyword(s):  
Virtual Reality ◽  
Experiential Learning ◽  
Learning Environments ◽  
Situated Learning ◽  
Second Life ◽  
Cultural Economic ◽  
Frequent Use ◽  
Digital Format ◽  
Pedagogic Tool ◽  
The Rich

<div>Fieldtrips are an important pedagogic tool for a range of disciplines. Indeed the pedagogic value of</div><div>experiential and situated learning was already promoted in the 1940s by the educational philosopher</div><div>John Dewey (1968). It is widely recognised that such trips allow students to benefit from the rich</div><div>experiential learning such endeavours entail and that situated learning environments assist in</div><div>crystallising learning outcomes (Jakubowski, 2003; Scarce, 1997).</div><div>However, today’s university environments are resource-constrained and traditional residential</div><div>fieldtrips have become less common. In response, we propose that the concept of ‘virtual’ fieldtrips</div><div>presents a potentially powerful tool, which if designed and applied appropriately, might replicate</div><div>some aspects of the ‘real’ fieldtrip experience. A virtual fieldtrip attempts to recreate aspects of the</div><div>real world in digital format where assignments and tasks similar in nature to those set in the</div><div>residential fieldtrip environment would be applied (virtual fieldwork). During the virtual fieldtrip</div><div>the student (in the form of an avatar) is digitally immersed into the social, cultural, economic and</div><div>environmental landscapes that ‘make’ places – something which is only possible at present through</div><div>residential fieldtrip activity. While this project does not propose that traditional residential fieldtrips</div><div>can be replaced by virtual fieldtrips, we believe students going on a virtual fieldtrip and conducting</div><div>virtual fieldwork are exposed to at least some of the valuable nuances of ‘real’ fieldwork.</div><div>In particular, in disciplines such as Tourism Management and Geography the value and indeed need</div><div>for these forms of situated and experiential learning is well established, however, the concept of</div><div>virtual fieldtrips also offers valuable learning environments for other disciplines. It is important to</div><div>note here that virtual reality software such as Second Life has been used by educational institutions</div><div>for many years, with the most frequent use for role play-based learning; for an overview of different</div><div>educational uses of Second Life see this document</div><div>http://piensl.pbworks.com/f/slliteraturereviewa1.pdf by Salt, Atkins, Blackall (2008). However, the</div><div>concept of virtual fieldtrips and the related student task of virtual fieldwork is shown by the</div><div>literature to be a novel use of virtual reality software; and the experience of developing such a</div><div>learning tool is thus worth researching and sharing.</div>

Convergent-beam thickness determination: The advantages of digital imaging

1994 ◽  
Vol 52 ◽  
pp. 420-421
Author(s):  
Stuart McKernan ◽  
C. Barry Carter
Keyword(s):  
Intensity Variation ◽  
Convergent Beam Electron Diffraction ◽  
Digital Data ◽  
Thickness Determination ◽  
Frequent Use ◽  
Automated Processing ◽  
Beam Thickness ◽  
Convergent Beam ◽  
Remarkable Agreement

Convergent-beam electron diffraction (CBED) patterns contain an immense amount of information relating to the structure of the material from which they are obtained. The analysis of these patterns has progressed to the point that under appropriate, well specified conditions, the intensity variation within the CBED discs may be understood in a quantitative sense. Rossouw et al for example, have produced numerical simulations of zone-axis CBED patterns which show remarkable agreement with experimental patterns. Spence and co-workers have obtained the structure factor parameters for lowindex reflections using the intensity variation in 2-beam CBED patterns. Both of these examples involve the use of digital data. Perhaps the most frequent use for quantitative CBED analysis is the thickness determination described by Kelly et al. This analysis has been implemented in a variety of different ways; from real-time, in-situ analysis using the microscope controls, to measurements of photographic prints with a ruler, to automated processing of digitally acquired images. The potential advantages of this latter process will be presented.

Human Vision and Computer Vision

1985 ◽  
Vol 30 (1) ◽  
pp. 47-47
Author(s):  
Herman Bouma
Keyword(s):  
Computer Vision ◽  
Human Vision

Knowledge of Category Attributes Determines Whether People Search for Diagnostic Comparisons

1999 ◽  
Author(s):  
Carla C. Chandler ◽  
Patricia Cheng ◽  
Keith Holyoak
Keyword(s):  
People Search

Computer vision for industrial applications

1983 ◽  
Vol 2 (5) ◽  
pp. 130
Author(s):  
J.A. Losty ◽  
P.R. Watkins
Keyword(s):  
Computer Vision ◽  
Industrial Applications

Is thyroid surgery performed too often in Germany?

2015 ◽  
Vol 54 (03) ◽  
pp. 101-105 ◽  
Author(s):  
F. A. Verburg
Keyword(s):  
Surgical Procedures ◽  
Thyroid Surgery ◽  
Needle Biopsy ◽  
Fine Needle Biopsy ◽  
Contributing Factors ◽  
Fine Needle ◽  
Diagnostic Measures ◽  
Frequent Use ◽  
Preoperative Diagnostic ◽  
The Usa

SummaryThyroid surgery is one of the more common surgical procedures in Germany. This is in contrast with the situation in some other countries, where this procedure is performed comparatively rarely. In this paper the number of thyroid surgeries in Germany is compared with other western countries (Netherlands, USA, England). In contrast to e. g. the USA and England the number of thyroid surgeries in Germany is declining, however with approximately 109/100 000/year in 2012 is still elevated (Netherlands: 16/100 000/year, USA: at least 42/100 000/year, England: at least 27/100 000/year).Possible contributing factors to this higher number of thyroid surgeries in Germany are explored. These factors include iodine deficiency, the frequent use of advanced diagnostics such as ultrasound, insufficient use of preoperative diagnostic measures such as fine needle biopsy and the practice of “defensive medicine”. How much each of these factors contributes is however unclear.

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