An Intelligent Banknote Recognition System by using Machine Learning with Assistive Technology for Visually Impaired People

Author(s):  
Sin-Chun Ng ◽  
Chok-Pang Kwok ◽  
Sin-Hang Chung ◽  
Yuen-Yan Leung ◽  
Hoi-Shan Pang
2021 ◽  
Vol 30 (01) ◽  
pp. 2140002
Author(s):  
Sin-Chun Ng ◽  
Chok-Pang Kwok ◽  
Sin-Hang Chung ◽  
Yuen-Yan Leung ◽  
Hoi-Shan Pang ◽  
...  

Visually impaired people are facing many difficulties in daily life because of the disability in visual sensation. In daily consumption, they are hard to perform the transactions solely. They need to be assisted by other people in daily life, especially in purchasing, since they cannot recognize the different products with similar shapes and sizes. Also, in processing payment, visually impaired people are hard to differentiate the denominations (values) of banknotes. And many derived problems, such as cheating and providing the improper products, are being occurred. In this paper, an intelligent recognition system has been developed for visually impaired people in Hong Kong. The application system can help the users recognize canned foods and differentiate the nominal values of the banknotes so as to complete the monetary transactions efficiently and effectively. The application can be installed in smartphones with voice and vibration. By applying neural networks with assistive technology, the accuracies of recognizing banknotes and canned food are over 95% and 75%, respectively.


2021 ◽  
Vol 20 (3) ◽  
pp. 244-282
Author(s):  
Fernanda Guimaraes ◽  
António Luís Rodrigues Faria de Carvalho ◽  
Paulo César De Almeida ◽  
Lorita Marlena Freitag Pagliuca

Objetivos: (1) Evaluar la idoneidad de la tecnología asistencial "Medicamentos: reflexión para la prevención" en cuanto a sus "objetivos", "accesibilidad", "claridad", "estructura y presentación", "relevancia y eficacia" e "interactividad" desde la perspectiva de las personas con discapacidad visual en Brasil y Portugal, y (2) comparar las evaluaciones de los participantes en Brasil y Portugal.Método: Estudio descriptivo y exploratorio desarrollado en asociaciones para personas con discapacidad visual. Participaron en el estudio sesenta y dos personas con discapacidad visual. Los datos se recopilaron a través de un Cuestionario de evaluación de tecnología de asistencia. Los datos se describieron mediante medios para analizar los atributos y se utilizó la prueba de Mann-Whitney para verificar la asociación entre los resultados en los dos sitios de estudio.Resultados: En Brasil, los participantes fueron predominantemente hombres, ciegos, con 14,81 años de escolaridad; y en Portugal los participantes eran predominantemente mujeres, ciegas, con 9,58 años de escolaridad. La evaluación de los participantes de la tecnología de asistencia fue buena en ambos países, con una puntuación media superior a 1,6. No hubo diferencias entre países (p> 0.05) en la evaluación.Conclusiones: La tecnología de asistencia sobre sustancias psicoactivas recibió una buena evaluación en Brasil y Portugal. Las diferencias entre los participantes de los dos países no interfirieron con la evaluación. Purpose: (1) To evaluate the appropriateness of the assistive technology "Drugs: Reflection for Prevention" in regarding its “objectives”, “accessibility”, “clarity”, “structure and presentation”, “relevance and effectiveness”, and “interactivity” from the perspective of visually impaired people in Brazil and Portugal, and (2) to compare the evaluations of participants in Brazil and Portugal.Method: Descriptive and exploratory study carried out in associations for visually impaired people. Sixty-two visually impaired people participated in the study. Data were collected through an Assistive Technology Assessment Questionnaire. Data were described through means to analyze the attributes and the Mann-Whitney test was used to verify the association between results in the two study sites. Results: In Brazil, the participants were predominantly male, blind, with 14.81 years of schooling; and in Portugal the participants were predominantly female, blind, with 9.58 years of schooling. The participants’ evaluation of the Assistive Technology was good at both countries, with a mean score above 1.6. There were no differences between countries (p > 0.05) in the evaluation. Conclusions: Assistive Technology on psychoactive substances received a good evaluation in Brazil and Portugal. The differences between the participants of the two countries did not interfere with the evaluation.   Objetivos: (1) Avaliar a adequação da Tecnologia assistiva “Drogas: reflexão para prevenção” em relação aos seus “objetivos”, “acessibilidade”, “clareza”, “estrutura e apresentação”, “relevância e eficácia”, e “interatividade” na perspectiva de pessoas com deficiência visual no Brasil e em Portugal, e (2) comparar as avaliações dos participantes no Brasil e em Portugal.Método: Estudo descritivo e exploratório desenvolvido em associações para pessoas com deficiência visual. Sessenta e duas pessoas com deficiência visual participaram do estudo. Os dados foram coletados por meio do Questionário de Avaliação de Tecnologia Assistiva. Os dados foram descritos em média para análise dos atributos e o teste de Mann-Whitney foi usado para verificar a associação entre os resultados nos dois locais de estudo.Resultados: No Brasil, os participantes eram predominantemente homens, cegos, com 14,81 anos de estudo; e em Portugal os participantes eram predominantemente mulheres, cegas, com 9,58 anos de estudo. A avaliação da Tecnologia Assistiva pelos participantes foi boa em ambos os países, com uma média acima de 1,6. Não houve diferenças na avaliação entre os dois países (p>0,05).Conclusões: A tecnologia assistiva sobre substâncias psicoativas recebeu uma boa avaliação no Brasil e em Portugal. As diferenças entre os participantes dos dois países não interferiu com a avaliação.


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