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首页> 外文期刊>Journal of optics, A. Pure and applied optics: journal of the European Optical Society >A novel subpixel edge detection system for dimension measurement and object localization using an analogue-based approach
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A novel subpixel edge detection system for dimension measurement and object localization using an analogue-based approach

机译：使用基于模拟的方法进行尺寸测量和目标定位的新型亚像素边缘检测系统

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摘要

This paper describes an analogue-based approach to subpixel-level edge detection for dimension measurement and object localization. Although the most common subpixel edge detection methods employ digital-based approaches, at present they show certain drawbacks such as the difficulty of real-time, in-line subpixel edge detection, the necessity of implementing expensive high-resolution A/D converters, and difficulty in performing continuous, dynamic supbixel edge detection. These drawbacks present a difficult problem in digital-based systems industrial applications. We propose a new analogue-based first derivative supbixel edge detection approach to overcome these drawbacks. Our method involves the approaximation of the distribution curve of the first derivative of the output of a CCD by using the second-order polynomial, and thus can accurately detect a peak position of the differential curve by means of the interpolating calculation, the operation of which is realized primarily through the use of analogue circuitry. The measurements of a concrete form using the prototype system demonstrate that its resolution under ideal conditions is about 1 * 10~(-1) pixels. While the resolution of this system decreases in an actual situation, the resolution remains at an acceptable subpixel level. We thereby conclude that the approach described in this paper is effective for real-time, low cost edge detection.
机译：本文介绍了一种基于模拟的子像素级边缘检测方法，用于尺寸测量和目标定位。尽管最常见的子像素边缘检测方法采用基于数字的方法，但目前它们显示出某些缺点，例如实时，行内子像素边缘检测的难度，实现昂贵的高分辨率A / D转换器的必要性以及难以执行连续的动态辅助边缘检测。这些缺点在基于数字的系统工业应用中提出了一个难题。我们提出了一种新的基于模拟的一阶导数次边缘检测方法，以克服这些缺点。我们的方法涉及通过使用二阶多项式逼近CCD输出的一阶导数的分布曲线，因此可以通过插值计算准确地检测微分曲线的峰值位置，其操作主要通过使用模拟电路来实现。使用原型系统对混凝土模板的测量表明，其在理想条件下的分辨率约为1 * 10〜（-1）像素。尽管该系统的分辨率在实际情况下会降低，但分辨率仍保持在可接受的子像素级别。因此，我们得出结论，本文描述的方法对于实时，低成本边缘检测是有效的。

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