圖像數(shù)據(jù)統(tǒng)計(jì)過(guò)程控制方法研究
[Abstract]:With the increasing application of machine vision system in industry, product information is presented in the form of image data more and more. How to use image data to monitor the production process has become a new subject of statistical process control. In this paper, the product images with consistent or specific patterns are taken as the research object. The shape of the migration region is unknown, and the number of the offsets is unknown. The methods of image data monitoring are studied under the condition that the gray values of adjacent pixels are highly correlated. Firstly, an image data monitoring method based on EWMA and region growth is proposed for the unknown shape of the offset region, and the detailed steps to implement the method are given. The effectiveness of this method in detecting irregular shape and shape of offset region is investigated by simulation experiments, and compared with the image data monitoring method based on maximum generalized likelihood ratio proposed by Megahed et al. The results show that the proposed method can not only detect the migration quickly, but also estimate the migration area more accurately. Then, an image data monitoring method based on the sum of generalized likelihood ratio is proposed, and the detailed steps to implement the method are introduced. The effectiveness of the method in detecting single or multiple offsets is investigated by simulation, and compared with the image data monitoring method based on the maximum generalized likelihood ratio proposed by Megahed et al. The results show that the proposed method is superior to the maximum generalized likelihood ratio method for image data monitoring. Then, a method of image data monitoring based on multivariate generalized likelihood ratio is proposed, and the detailed steps to implement the method are given in view of the high correlation between the gray values of adjacent pixels in the image. The effectiveness of the method in detecting single or multiple offsets is investigated by simulation, and compared with the image data monitoring method based on the maximum generalized likelihood ratio proposed by Megahed et al. The results show that the proposed method is superior to the maximum generalized likelihood ratio method for image data monitoring. Finally, the image data monitoring method based on multivariate generalized likelihood ratio is applied to practical cases. The application results show that the method can not only detect the migration quickly, but also provide information about the time and region of migration. Help employees diagnose the process, find the cause of the exception, and resume the process as soon as possible.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:TP13
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