Research On The Design Of Guide Aids For Visually Impaired People

Statistics from the World Health Organization indicate that there are currently at least2.2 billion visually impaired people worldwide,of which 1 billion suffer from moderate to severe visual impairment or blindness,and it is estimated that by 2050 only The number of blind people will exceed 100 million.Visual dysfunction not only constrains the mobility of this vulnerable group,but also seriously affects their life and career choices,and even affects their right to social welfare.Because of the current low penetration rate of guide dogs and the problem that traditional guide aids cannot meet the travel needs of visually impaired people,this topic will propose wearable aids that provide visually impaired people with a guide function through tactile perception.The design scheme aims to ensure that visually impaired people can travel independently and safely.Through observation and interviews with visually impaired people,the author summarizes the needs of visually impaired people for using aids for the blind,and then combines the current development status of aids for the blind and related technologies to transform the functional requirements of the aids into conceptual ideas.And according to the basic cognitive system and specific cognitive theory of the visually impaired,and based on the existing technology,output the design scheme of the blind guidance aids of this subject:one is tactile perception sliding guidance,the use process can be A guide belt that liberates both hands;the other is a wearable flying guide dog that senses traction and guides in the form of touch.In the process of prototype development,unit tests and improvement designs were carried out on the two prototypes of assistive devices respectively,and then the optimized prototypes were tested for usability,and user experience evaluation and interviews were conducted with the subjects after the experiment,and finally,the topic was summarized.Values and shortcomings of research design.Among them,during the prototype test experiment,the subjects wearing the prototype of the blind guide aids walked oriented according to the guiding instructions in the experimental scene.The author used a binocular camera（ZED）and indoor positioning system（UWB）to track and record the path that the subjects traveled,and then the subjects used blind canes,guide belts,and flying guide dogs.The author summarizes the results of the experiment based on the user experience scale and the interview questionnaire.The results of the experiment: the walking effect of the user using the guide belt and the flying guide dog is close to the effect of using the blind cane to be pulled,and can accurately follow the guide route.Reach the destination;there will be some errors in the user’s walking route using the guide belt for the blind,but the effect of completely liberating hands can be achieved during use;the tactile interaction effect of the user when using the flying guide dog is more obvious,so the flying guide dog gives the user The sense of orientation conveyed is more accurate.This topic proposes two designs of blind guidance aids based on tactile perception.The user perceives the guiding direction of the blind aid in real-time through different tactile interaction methods and no longer concentrates on voice interaction during travel,so it is suitable for more outdoor environments.During the testing process of its prototype development,the author learned and tried a variety of technical and structural improvement methods,and in the usability testing experiment,found some practical problems that were not considered in the design process,which provided the follow-up iterative design.Reference.The final two design schemes of blind guide aid meet the needs of visually impaired people to guide the blind when they travel,and their cost is low,the operation is simple in the process of use,and has high practical significance and social value.