Location and recognition method of digital tube of digital display instrument under complex environment
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摘要: 针对矿山设备高压配电室机器人巡检系统中数显式仪表数码管难以有效定位与准确识别的问题，提出了一种复杂环境下数显式仪表数码管定位与识别方法。在数码管区域定位中，首先通过特征图像和标记分水岭算法初步定位数码管区域，然后使用大津阈值法和标记分水岭算法得到二值图像，并对其进行投影分割得到数码管字符，最后采用局部二值模式特征和支持向量机分类算法排除非数码管区域，提高数码管定位准确率；在数码管字符识别中，首先使用自适应Canny算法提取数码管字符边缘，然后采用Radon变换估计数码管字符倾斜角度，再使用滤波模板滤除噪点，最后通过穿线法识别数码管字符。试验结果表明，该方法能适应不同光照、数码管大小和字符倾斜角度，具有较高的定位和识别准确率。Abstract: For problem that digital tube of digital display instrument is difficult to locate and accurately recognize in robot inspection system of mine equipment high-voltage distribution room, a location and recognition method of digital tube of digital display instrument under complex environment was proposed. In aspect of digital tube location, feature graph and mark-based watershed algorithm are used to roughly locate digital tube. Then binary image is obtained by use of Otsu threshold method and mark-based watershed algorithm and split by projection, so as to get digital tube character. Non-digital tube area is excluded by local binary pattern feature and support vector machine classification algorithm, which can improve location accuracy of digital tube. In aspect of digital tube character recognition, self-adaptive Canny algorithm is used to extract edge of digital tube character. Then Radon transform is adopted to estimate tilt angle of digital tube character, and filter template is used to remove noise. Finally, threading method is introduced to recognize digital tube character. The experimental results show that the method has high location and recognition accuracy, which can adapt to different lighting, digital tube size and tilt angle.
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