Stage and its supporting equipment is for the opera, song and dance performances to provide venues, and rendering the scene of the comprehensive facilities, has become an indispensable part of modern art performances. With the development of modern stage performing arts and the development of control technology, people on the stage equipment requirements are also rising. Modern stage machinery and equipment a wide range of control complex, taking into account its reliability, safety, accuracy and complexity of the situation, the stage mechanical equipment monitoring system research has been widespread concern. At present, the stage mechanical system to use industrial control software to monitor it, can only see some of the abstract symbols and names composed of the screen, in this environment, the operator prone to misuse, ranging from the performance of the effect Cause a security accident. Therefore, the development of a multi-sensor fusion online monitoring technology, with a visual interface to the stage monitoring system, is imperative. Based on the research of the existing stage monitoring technology at home and abroad, the author discusses the relationship between infrared video moving target detection system, internal communication system, multi-sensor fusion monitoring system, visual control system, on-line monitoring and monitoring system Technology to achieve the stage performance of real-time monitoring and scheduling management of the feasibility, so as to ensure the effectiveness of the stage performance and performance security.
1 infrared camera monitoring technology
The stage is a complex environment with many special equipment, frequent lighting changes and other special circumstances. Therefore, the active infrared video moving target detection and identification technology can be introduced into the stage detection and monitoring, and the moving target and the motion trajectory are positioned and identified by presetting the infrared camera in advance. When the system is detected abnormal system, the trigger signal, trigger the camera to quickly capture the fault point of the screen information, the screen information sent to the monitoring center terminal display, so that monitoring personnel quickly grasp the abnormal situation information, make emergency response, improve the level of stage monitoring , Security performance carried out smoothly and safely. In the infrared image, both the target and the target are the main detection methods, namely, track before detect (TBD) and the detect before track (DBT), the two Methods used in the mathematical tools and algorithms shown in Figure 1. In recent years, infrared target detection and identification methods are mainly focused on the following aspects.

Figure 1 Mathematical tools and algorithms for the two detection methods
1.1 artificial neural network (ANN) identification
Artificial neural network is composed of many simple basic elements - neurons connected with each other, with adaptive nonlinear dynamic system, it can reflect a number of basic characteristics of the human brain, with large-scale parallel, self-organizing ability, self-learning , Can adapt to the environment, to complete the more complex non-linear operations, identification and process control tasks.
1.2 Multi-sensor information fusion identification
Multi-sensor information fusion technology uses different sensors to obtain the target, the use of different sensors in the work of the complementary, can fully improve the complex scene in the target detection, identification and tracking capabilities.
1.3 Expert system identification
Expert system is to explore and simulate human high-level visual cognitive mechanism, the human reasoning method with a computer system to describe, so as to obtain similar results with the expert identification method. According to the needs of stage equipment management, the classification of moving objects and trajectories can be defined as different types of suspicious targets, and then judgments, identification and alarm are carried out according to different grades. The identification process is shown in Figure 2. Dynamic infrared target recognition system is mainly for the stage equipment movement state monitoring and alarm, requires a large number of infrared cameras, by the monitoring program for automatic detection and identification of suspicious targets to be the appropriate alarm. The systems signal transmission process includes: video capture, video transmission, software identification, display and alarm. The flow chart is shown in Figure 3. The main hardware devices of the system include: image acquisition equipment (infrared camera), image transmission equipment, image processing equipment. The system uses the infrared night vision camera, the camera can adapt to the various indoor environment, real-time, stable collection of video information for the stage equipment management to provide accurate information security.

Figure 1 Mathematical tools and algorithms for the two detection methods
1.1 artificial neural network (ANN) identification
Artificial neural network is composed of many simple basic elements - neurons connected with each other, with adaptive nonlinear dynamic system, it can reflect a number of basic characteristics of the human brain, with large-scale parallel, self-organizing ability, self-learning , Can adapt to the environment, to complete the more complex non-linear operations, identification and process control tasks.
1.2 Multi-sensor information fusion identification
Multi-sensor information fusion technology uses different sensors to obtain the target, the use of different sensors in the work of the complementary, can fully improve the complex scene in the target detection, identification and tracking capabilities.
1.3 Expert system identification
Expert system is to explore and simulate human high-level visual cognitive mechanism, the human reasoning method with a computer system to describe, so as to obtain similar results with the expert identification method. According to the needs of stage equipment management, the classification of moving objects and trajectories can be defined as different types of suspicious targets, and then judgments, identification and alarm are carried out according to different grades. The identification process is shown in Figure 2. Dynamic infrared target recognition system is mainly for the stage equipment movement state monitoring and alarm, requires a large number of infrared cameras, by the monitoring program for automatic detection and identification of suspicious targets to be the appropriate alarm. The systems signal transmission process includes: video capture, video transmission, software identification, display and alarm. The flow chart is shown in Figure 3. The main hardware devices of the system include: image acquisition equipment (infrared camera), image transmission equipment, image processing equipment. The system uses the infrared night vision camera, the camera can adapt to the various indoor environment, real-time, stable collection of video information for the stage equipment management to provide accurate information security.

Figure 4 internal communication command system architecture
2.1 Assignment of Party Line
According to the functional requirements and performance of the theater, the division of labor is as follows:
(1) stage sound group including tuner, sound engineer, computer arrangement, etc .;
(2) stage lighting group, including dimmer, computer lighting division, chasing light control, stage lighting control;
(3) stage machinery group, including the stage mechanical supervisor, on-board mechanical control, under the machine control, programming and so on;
(4) stage art group, including director, art director, host, choreography design, subtitles, command, dance choreography, modeling, make-up staff;
(5) Auxiliary staff group includes video control, props, maintenance personnel and so on.
2.2 Workgroup communication design
According to the needs of the communication function, the workgroup channel can be divided into six channels (see Figure 5): PL1 (shared), PL2 (stage sound), PL3 (stage lighting), PL4 (stage machine), PL5 (stage art), PL6 (support staff). All team members are dual-channel, connected through the common channel PL1, through another channel and group communication.

Figure 5 Workgroup channel profile
3 multi-sensor technology integration monitoring
Through the multi-sensor technology, in the stage of the subsystems implanted in a variety of sensor sensors and control chip, through the console and internal LAN link between the real-time detection of the various stages of the monitoring system equipment, working environment and working conditions, Improve the safety of the stage performance.
(1) The lighting system uses the RDM control protocol to configure the lighting system equipment for the RDM function, to realize the address code reading and writing of the lighting equipment, turning on the lights, resetting the equipment, adjusting the attributes, the sensor information (temperature / humidity / voltage / current / Acceleration, pressure, etc.), dimming curve, minimum grayscale, maximum grayscale, start mode, failure mode, device self test, output response time, lock code, software version and other online monitoring function.
(2) stage mechanical system application of remote intelligent control module, set up RS-485 network, design stage equipment and equipment under the platform weak equipment control circuit, the application of multi-function stroke limiter, the sensor voltage signal and other related information feedback function , To achieve on-site mechanical system on-line monitoring function.
4 visualization operation monitoring technology
By introducing the virtual reality technology into the field of stage mechanical control, the 3D development environment is used as the platform, the stage scene and the mechanical graphic development are developed by OpenGL, and the 3D model is quickly established by means of the third party modeling software. The program reproduces the real-time movement data of the stage machinery to complete the synchronous movement of the stage machinery and the virtual stage machinery, so as to realize the purpose of the three-dimensional visual control of the stage machinery, real-time detection and monitoring the working environment and working status of the subsystem equipment of the stage Performance of the security. The virtual stage model is shown in Figure 6.

Figure 6 Virtual Stage Model
First, in the VB environment to build OpenGL program framework to achieve the VB platform using OpenGL for graphics development; Secondly, the use of 3DS MAX stage scenes and mechanical three-dimensional virtual model, derived into STL format files, and read the program in the STL file , The use of OpenGL library function to reproduce the model; Finally, real-time connection to the stage mechanical motion data to complete the stage scenes and part of the mechanical movement of the animation simulation, which in the upper interface and the actual stage similar to the scene, easy to monitor the operator. Reproduce the model shown in Figure 7.

Figure 7 Virtual stage model in VB to reproduce
5 online monitoring and monitoring technology
Through the wireless remote monitoring software, in Andrews development platform, the application of wireless LAN technology, design stage system equipment online monitoring and monitoring system. This remote monitoring system runs on the Android Tablet PC through wireless WIFI LAN technology to achieve the purpose of controlling the remote client. Based on Remote Desktop Remote Desktop Monitoring Software, this remote monitoring system is based on the application of Windows RDP Remote Desktop Communication Protocol and JPEG image compression. JAVA language written; the main design to achieve desktop capture and transmission, mouse response, and keyboard response and other basic functions.
According to the engineering requirements, the basic function requirements of the remote control software include the following:
(1) real-time monitoring of the server-side remote desktop;
(2) mouse response operation, to achieve click, drag, up and down the simulation mouse wheel;
(3) keyboard response operation, to achieve a virtual keyboard, in response to press the lift operation;
(4) to achieve remote control file open, close operation;
(5) remote shut down the server.
Chooseed from "Performing Arts" 2015 the first 11

Previous： Stage lighting design television program

Previous： The audio backup system includes what is in the studio