Abstract: With the continuous development of virtual reality and augmented reality technology, its application in the tourism industry is becoming more and more wide. Under the condition of the progressive expansion of the virtual tour guide application, the use of character recognition technology instead of the traditional GPS positioning and wireless radio frequency technology to realize the user positioning has the advantages of strong anti-interference, accurate positioning, high positioning efficiency and wide range of use. Taking the virtual tour guide system on campus as an example, the Unity 3D as the development platform and C# as the development language, this paper applies the algorithm of object cutting based on appearance information to realize the character recognition of natural scene through the prefabricated character recognition library and the design of character recognition filter, identifies the name and position of the current place through the recognized characters, and loads the introduction and other virtual information of corresponding place quickly and accurately. Through the experimental verification, the text recognition technology in the natural scene used in this system not only has the characteristics of fast recognition speed and high accuracy, but also can provide a user positioning method for the virtual tour guide system.

Key words: word recognition, virtual tour guide, optical character recognition, computer vision, Unity 3D