Indoor Location-aware Method Based On Two-dimensional Code By Smart Phone

In large and complex indoor environment,such as museums,underground parking,large supermarkets,underground mines and other areas,their internal structure is complex and volatile,to people's perception of space has brought serious challenges,and intensified people's Indoor location-aware services.At the same time,such as WIFI,RFID and other indoor location sensing technology also homeopathy,but WIFI low stability,low accuracy and high cost of RFID shortcomings,greatly limits the indoor location sensing technology development.In this paper,the two-dimensional code as a marker for storing information,and by measuring the distance between smart phones and two-dimensional code to determine the user's indoor location,in order to provide a cheap easy to deploy,high precision,high stability indoor location Perceived Service.For this purpose,this paper has done the following work:1.Aiming at the problems of blurring,shadowing and deformation which may occur in the process of obtaining the two-dimensional code information,a series of image processing operations are adopted to improve the readability of the image.2.Based on the detailed analysis of the two-dimensional code symbol structure and the recognition of the original two-dimensional code recognition algorithm,this paper proposes a new method for the position detection graphics center Point grouping method,which effectively solves the problem of multi-dimensional code recognition.3.contrast the difference between camera and mobile phone camera,combined with the relevant technology of Android camera,the method of acquiring the focal length of mobile phone camera is proposed.4.Based on the monocular ranging based on the surveillance camera,this paper proposes a monocular ranging method suitable for smart phones.By analyzing the application scenarios and advantages and disadvantages of focusing and defocusing in the monocular ranging algorithm,the focus distance is selected as the range finding method,and then the mobile phone built-in sensor is used to obtain the information of the mobile phone,which makes the positioning more accurate.5.According to the scene of application,the video frame database is established,and the video is classified according to the factors such as recognition distance,angle,lighting condition,background complexity and fuzzy.The experimental results show that this method can effectively solve the need of position-aware location service for stability,real-time and high precision by improving the way of obtaining the two-dimensional code information and the proposed method of monocular ranging for intelligent mobile phones,and greatly reducing the cost.