Research Of The Real-time Rock Deformation Monitoring System

The roof and side fall accident is one of the most common accidents in the coal mine accident. In many diggings, digital video surveillance system is adopted to obtain the image of the tunnels, and the artificial method is used to observe and analysis the safety condition of the tunnels. But the specific data of the tunnels deformation must be detected by the displacement sensor. With the maturing of the photogrammetry technology, the real-time of rock deformation system based on the binocular stereo vision is possible to be realized. It has a great significant to the mine safety production to replace the measurement of traditional sensor by camera, which can fully play the roles of the digital video surveillance system, and can also save a great deal of manpower and materials resources.Based on the requirement of the real-time rock deformation monitoring system, the system structure, function modules and database are designed. Then, a series of configured equations are set to optimize the configuration parameters of the system. After the technology of the binocular stereo vision measurement to be studied, according to background of the real-time rock deformation monitoring, a camera calibration method which based on the template plane is selected to calculate the internal and external parameters of the camera, the distorted image and the stereo image is recifted by the calibrated parameters. With the digital image processing technology is deeply studied, a method of the image processing is proposed for the real-time rock monitoring system. The method of the median filter, histogram equalization and Wallis sharpening is adopted to remove the image noise and enhance the edge information of the image features. The feature matching of the stereo images can be achieved by the Harris corner detection and the epipolar constraint technique. The three dimensional spatial coordinates of the feature points are calculated by the calibrated parameters. The deformation of the rock surface is obtained by analyzing the characteristics of different time, and then the data reports, fitting figure of the rock surface and vector diagram of the rock deformation are generated.Simulation results show that the method of the monitoring system which based on the stereo vision is feasible because of the error of the measurement is within 5%.Furthermore, the function of the real-time and visual effect have all achieved the design requirements.