Abstract: The food and drug safety is related to people’s livelihood and public safety issues, so medical injection must be through quality and safety tested when using. Otherwise, it will cause a variety of diseases or even life-threatening. At present, pharmaceutical manufacturers still use artificial lighting inspection method to control the quality of injection. This inspection method has many defects, such as low speed, poor stability, low level of security. So in order to solve this problem and improve the level of drug security status, it is very necessary to introduce a type of robot based on machine vision technology to inspect pharmaceutical injection instead of people. Key technical problems encountered are discussed in the development process of the inspection robot, including overall solutions of the robot, the design of high precision mechanical structure, the synergistic control method of sever motors, the high-speed and high-precision image acquisition system and methods of weak target to detect, recognize and classify. The research and development bottlenecks which constraint the robot and feasible solutions are elaborated, and the next step in the development trend of the visual inspection robot is stated.

Key words: Machine vision, Sequence frame differential method, Small and weak target High speed and precision, Visual inspection robot