Research on colorless silicone oil injection measurement system for neutral pen-refill
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摘要:
针对中性透明笔芯和无色硅油灰度差异小所导致的硅油注入量检测困难等问题，提出并设计一种基于机器视觉的无色硅油注入量检测方法与系统。该系统硬件部分主要包括图像采集单元和外部光源控制单元等，通过调节外部光源照射角度实现无色硅油区域灰度差异的增强；软件与算法部分运用一种灰度区域直方图算法，在搭建的人工交互界面上选取相应的感兴趣区域（ROI）及参数，实时显示长度检测结果。试验结果表明，该系统能准确检测硅油连续长度，系统的实时性及稳定性较好，准确率高，具有一定的推广应用价值。
Abstract:Aiming at the difficulty in detecting the amount of silicone oil injection caused by the small gray difference between the neutral transparent refill and the colorless silicone oil, a new method and system for detecting the injection amount of colorless silicone oil based on machine vision was proposed and designed. An image acquisition unit and an external light source control unit were the main hardware part of the system. By adjusting the illumination angle of the external light source, the enhancement of the gray difference in the colorless silicone oil area can be realized. In the part of software and algorithm, a gray region histogram algorithm was used to select the corresponding region of interest (ROI) and parameters on the constructed human interaction interface, and the length detection results were displayed in real time. The experimental results show that the system can accurately detect the continuous length of silicone oil, the system has good real-time performance and stability, high accuracy, and has a certain value of promotion and application.
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Key words:
- colorless silicone oil /
- pen-refill /
- image filtering /
- grayscale difference /
- machine vision
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图 1 自然光照下硅油区域原始灰度图
Figure 1. Original grayscale image of silicone oil area under natural light
图 3 基于机器视觉的硅油长度检测算法流程图
Figure 3. Flow chart of silicone oil length detection algorithm based on machine vision
图 4 不同照射角产生的对比度差异及选取的ROI
Figure 4. Contrast difference and selected ROI produced by different illumination angles
图 6 不同照射角所对应的ROI区域灰度直方图
Figure 6. Gray histograms of the ROI region produced by different illumination angles
表 2 不同检测方法的混合矩阵
Table 2. Hybrid matrix of different detection methods
支 产品类别 本研究检测方法 人工检测方法 合格数量 缺陷数量 合格数量 缺陷数量 合格数量 298 2 283 17 缺陷数量 4 96 12 88 
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表 3 不同检测方法的真正率、真负率和准确率
Table 3. True rate, true negative rate and accuracy rate of different detection methods
% 不同方法 真正率 真负率 准确率 本研究检测方法 99.30 96.00 98.50 人工检测方法 94.30 88.00 92.75
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表 4 不同ROI区域宽度测量的长度值
Table 4. Measured length value of different ROI area width
长度参数 ROI宽度/pixel 40 35 30 25 测量值/pixel 201 203 206 208 理论值/pixel 210 210 210 210 误差/% 4.30 3.30 1.90 0.95
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