镁熔液弱小目标实时识别及测控系统设计

发布时间：2018-05-07 01:27

本文选题：弱小目标 + DSP　；参考：《安徽工业大学》2017年硕士论文

【摘要】：本文课题来源于国家自然科学基金项目“基于实时图像处理的镁熔液含氢量自动检测方法与实验研究”(批准号为51374007)。镁熔液含氢量的检测是保证镁合金铸件质量的重要步骤,镁熔液表面第一气泡的实时识别以及镁熔液含氢量的自动检测是整个问题的重点、难点,因此对第一气泡检测算法与含氢量自动检测方法的研究具有重要的意义。研究了镁熔液图像中第一气泡的特性,结合半因果支持域和背景预测算法的优势,提出了基于E字型半因果支持域和双层流水线的镁熔液第一气泡检测算法,并利用MATLAB工具对算法进行仿真,仿真结果表明,该算法不仅能够检测出第一气泡目标并且在图像噪声抑制方面、实时性方面更具优势。针对基于E字型半因果支持域和双层流水线的算法局限于MATLAB仿真的缺陷,通过软件编程将该算法移植到DSP平台上,其次为解决镁熔液含氢量自动检测问题,设计了两种镁熔液含氢量测控系统,其中一种以DSP为图像处理单元,PLC为控制单元,然后分别设计了基于数字I/O、MODBUS RTU协议的通信硬件电路;另一种以DSP为图像处理单元,GTS-400系列运动控制器为控制单元,并分别设计了基于数字I/O、RS232接口的通信硬件电路,最后对两种系统的图像处理单元和控制单元进行软件编程,实验结果表明:两种系统不仅能成功检测出镁熔液第一气泡,并且图像处理单元检测出第一气泡后,控制单元能迅速响应并根据程序输出,成功实现图像处理单元与控制单元之间的通信。基于E字型半因果支持域和双层流水线的算法在MATLAB平台以及DSP平台上成功检测出镁熔液第一气泡,对图像识别方法应用于镁熔液第一气泡的检测具有重要指导意义,此外,基于DSP与PLC、DSP与运动控制器测控系统的设计与通信实现,对探究适用于工业现场自动检测镁熔液含氢量的方法具有重要科学价值和深远意义。
[Abstract]:This paper comes from the project of National Natural Science Foundation of China, "automatic detection method and experimental study of hydrogen content in magnesium melt based on real-time image processing" (Grant No. 51374007). The detection of hydrogen content in magnesium melt is an important step to ensure the quality of magnesium alloy castings. The real time identification of the first bubble on the surface of magnesium melt and the automatic detection of hydrogen content in magnesium melt are the key and difficulties of the whole problem. Therefore, it is of great significance to study the first bubble detection algorithm and the automatic detection method of hydrogen content. The characteristics of the first bubble in the magnesium melt image are studied. Combined with the advantages of the semi-causal support region and the background prediction algorithm, a first bubble detection algorithm for the magnesium melt is proposed based on the E-shaped semi-causal support region and the double-layer pipeline. The simulation results show that the algorithm not only can detect the first bubble target, but also has more advantages in real-time image noise suppression. In view of the limitation of the algorithm based on E-shape semi-causal support domain and double-layer pipeline to MATLAB simulation, the algorithm is transplanted to DSP platform by software programming, and the second is to solve the problem of automatic detection of hydrogen content in magnesium melt. Two kinds of hydrogen content measurement and control systems for magnesium melt are designed, one of which is DSP as image processing unit, and then the communication hardware circuit based on digital I / O Modbus RTU protocol is designed respectively. The other is the DSP as the image processing unit and the GTS-400 series motion controller as the control unit, and the communication hardware circuit based on the digital I / O / OF232 interface is designed respectively. Finally, the image processing unit and the control unit of the two systems are programmed by software. The experimental results show that not only the first bubble of magnesium melt can be detected successfully by the two systems, but also the control unit can respond quickly and output according to the program after the image processing unit detects the first bubble. The communication between the image processing unit and the control unit is realized successfully. The algorithm based on E-shape semi-causal support domain and double-layer pipeline successfully detects the first bubble of magnesium melt on MATLAB platform and DSP platform, which has important guiding significance for the application of image recognition method to the detection of the first bubble in magnesium melt. The design and communication of the measurement and control system based on DSP and PLC DSP and motion controller are of great scientific value and profound significance in exploring the method of automatically detecting hydrogen content of magnesium melt in industrial field.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG292;TP391.41

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