Auxiliary Smart Glasses for Visually Impaired People Based on Two-dimensional Code Positioning

In order to solve the travel problem of the large number of visually impaired people, wearable visual auxiliary equipment has been proposed and extensively studied as a key technology. However, the current research work focused on the perception of external objects in the environment, rather than the location of the visually impaired people. In this paper, we proposed a positioning scheme based on two-dimensional (QR) code to obtain the location of the visually impaired. Specifically, we designed the three-point positioning scheme. Then we proposed a two-point plus orientation positioning scheme to compensate for the low accuracy of distance estimation. Especially, we have implemented a smart glass to provide intelligent guidance for the visually impaired. Through the analysis and calculation of the image, smart glasses use voice broadcast to provide obstacle warning, walking navigation and other guidance services for the visually impaired. Experimental results show that compared with the existing Bluetooth, WiFi and other methods, the QR code positioning solution we proposed has better positioning accuracy and lower cost. Moreover, compared with three-point positioning, the two-point plus orientation positioning method greatly improves the success rate of positioning, which proves that the introduction of orientation can solve the problem of insufficient ranging accuracy and meet the engineering requirements of smart glasses.