The Acquisition System Design Of Multiple High-frame-frequency Industrial Video

With the rapid development of video capture technology, as well as the substantial increase of industrial automation, applications of video capture system has expanded rapidly from traditional areas such as security and transportation to emerging industries such as new energy, new materials and robots, and are used more and more in these areas. In the field of nuclear industry, in order to reduce the worker's activity time in the radiation field, the manual inspection of the related fields needs to capture images and videos of the scene by video capture system and transmit to the computer for manual testing. Although traditional video capture technology has matured, the video capture systems are based on wide-field imaging. Its field of view is large and image definition is not high. And there even exists an imaging blind angle in it. So these video capture systems are not suitable for some certain situations in the nuclear industry. Based on the requirement of detecting the surface thread of the nuclear reactor pressure vessel's bolt and the analysis of the present development status of video acquisition system, this paper presented a design of the multi-channel high frame-rate industrial video acquisition system. The main work of the paper is as follows:The hardware circuit of the video capture system is designed. The system uses six CMOS cameras to realize the imaging in the bolt hole without blind angle in the 360°range, uses the video processing SOC chip-HI3516-as core processor to realize video capture and compressing coding, uses the FPGA to realize the outputting of LVDS signal which converted from the packed multi-channel video data whose packing is realized by the FPGA, transmitting the signal to the receiving computer in hundreds of meters outside through a driver of LVDS bus. The system projects a PCI Express card to realize series-to-parallel of LVDS signal and the unpacking of data on the receiving end, to realize the storage of multi-channel data, real-time display and playback on PC, etc. According to specific requirements of the system's technical indicator, this paper put forward the design scheme of the hardware of the system, accomplished the selection of core devices and completed the design of the HI3516's system circuit, the OV9712's image sensor circuit, the sender FPGA system circuit, the LVDS drive circuit, the receiver FPGA system circuit and the power supply circuit of the system, etc.PC side software is designed. According to the requirements of the system software, accomplished the design of driver and application programming. Application programming includes the design of the foreground application's interface and background programming. The foreground application implements the real-time display and playback of the video data. The background program realizes the storage of various video data.