Abstract:

Two-dimensional code has become increasingly widespread and penetrated into every aspect of social life. It is one of the most important links between online and offline now, but the security issues cannot be ignored. Two-dimensional code has been used to spread harmful information, which has brought a new challenge to network and information security. Aiming at the most widely used tow-dimensional code — Quick Response (QR) code, this paper studies key technologies such as QR code positioning, QR code graphic distortion correction, QR code decoding etc, and introduces the design and implement of a practical real-time monitoring system. The experimental results show that the recognition accuracy is 96%, the recall is 90%, and the recognition speed is 30 pictures per second on the test data set of 5000 pictures which contain QR code, basically meeting the need of real-time application.

Key words: two-dimensional code, QR code, picture monitoring system