Volume 3 Issue 1
Authors: Lanxiang Zhu; Chunyang Wang; Lifei Deng; Zhen Wang; Qifan Liu
Abstract: This paper proposes an auto-focus method for microscope which is based on Ostu segment. The method uses the variance of the two classes of the segment results as the guidance of the auto-focus process. The guidance function responses within a wide object distance range. It has a strong anti-jamming ability and it provides a wide range of the guidance value. At the same time, it requires less calculation than the existing guidance. The paper analyzes the existing guidance function and the proposed method to evaluate the guidance, and then compares the new method with the existing methods.
Keywords: Auto-focus; Ostu; Guidance Function; Optical Microscope
Authors: Cheng Xuan; Yang Xiangdong; Cao Diansong
Abstract: The new generation FPGA technology enables an embedded processor with application of intellectual property (IP) cores into a system-on-programmable-chip (SoPC) development environment. Therefore, in this paper, a study presents a motion control integrated circuit (IC) for DC motor devices under SoPC technology. Firstly, the architecture of the control IC is described, including several customized application IP cores and a Nios II embedded processor. The designed applications IPs are utilized to implement the motion trajectory algorithm, an improved PID controller, PWM signals generation and position decoder in hardware owing to the low control latency, high reliability, and high sampling frequency control (sample interval is 128μs). The Nios II processor is used to synchronize the state of each part and communicate with host processor in software. All of them connect to each other via Avalon bus. Finally, a verification system is set up and some experimental results are demonstrated. The contribution of this work is to implement a motor control system in a single chip combing low control latency, high sampling frequency control with flexibility and scalability based on SoPC technology, compared with traditional LM629 or other ASIC-based and DSP-based controllers.
Keywords: Motion Control; DC Motor Device; SoPC; Trajectory Generation; Improved PID Controller; IP Cores; Embedded Processor