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Articles by Yigang He
Total Records ( 4 ) for Yigang He
  Qiwu Luo , Yigang He , Wenxin Yu and Jian Zheng
  Real time quality control based on machine visual in sheet material industries is becoming a crucial technology. During the defect inspection process, surface image acquisition which is the first significant step, is challenging since fast manufacture speed and various tough condition. Choosing DS90CR288A, DS90LV047 and DS90LV019 for series-parallel data conversion and command interaction, this study presents a hardware architectural structure and turns it into reality, then develops driver program embedded into Field Programmable Gate Array (FPGA), we reduces the signal crosstalk through using reasonable termination, differential pairs controlling and the division of ground etc. The data transfer rate of this image acquisition system can reach up to 5.12 Gbps when pixel clock is up to 80 MHZ with an excellent performance. And it has already been applied to a hot rolling strip surface inspection system steadily for more than one year.
  Qiwu Luo , Yigang He , Wenxin Yu and Jian Zheng
  Real-time surface defect inspection of sheet materials is increasing challenge due to the fast production rhythm and high requirement of quality. Choosing Xilinx Virtex-6 FPGA XC6VLX240T, this study presents an embedded hardware scheme for online image acquisition and parallel data processing, then realized it on a 12-layer Print Circuit Board (PCB) with a high performance of signal integrity. The equipped PCI express (PCIe) interface supports expansion with host PC smoothly which had achieved an actual peak transfer rate high up to 1.788 Gbps. At the end of this study, the designed FPGA platform was used as a sub-system to steel surface inspection equipment applying in a hot-rolled workshop. The application effects showed that this system was qualified for the real-time computational task when the maximum rolling speed is as high as 18 m sec-1. Due to the advantages of source-open, customization and cost-effectiveness, the embedded FPGA platform is standing ready for widespread adoption of quality assurance in the sheet material fields.
  Hongmin Li , Yigang He and Yichuang Sun
  For implementing wavelet transform in analog hardware systems with very low power consumption and small size, a particle swarm optimization method is employed in the approximating of wavelet functions. First, utilizing the least-squares error criterion, a general mathematical model for approximating wavelet functions is established. Then the technique of L2 approximation based on Particle Swarm Optimization (PSO) is presented, which is more attractive. These techniques are compared by means of a worked example, involving some wavelet approximation. The L2 approximation approach based on PSO is shown to exhibit superior performance.
  Xianming Wu , Yigang He , Qiwu Luo and Baiqiang Yin
  In this study, a method is proposed to design a one-dimensional (1-D) multi-scroll chaotic circuit by using Current Feedback Operational Amplifiers (CFOAs). A chaotic circuit is designed which consists of three integrators and one nonlinear circuit. The circuit can generate 1-D multi-scroll chaotic attractors. The central frequency of the circuit is higher with fewer active devices and simpler circuit construction. Numeral simulation, circuit simulation experiments are performed and results show that the method is feasible and circuit design is correct.
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