电磁兼容图片测试曲线的数据提取方法研究

Data extracted method based on image of EMC test curve

针对电磁兼容(EMC)测试曲线频带宽、频谱密集重叠、坐标系种类不单一等异于其它测试曲线的特点,提出一种面向电磁兼容图片测试曲线的数据提取方法。利用图像处理方法的多样性,根据图片二维曲线的像素坐标与坐标轴分布关系推导出的数学公式,对图片坐标轴内的有效区域进行像素点遍历扫描,从而实现图片中曲线数据的提取,并通过MATLAB软件实现。对实测曲线图片的数据提取结果表明,该方法精度较高,效率较人工处理提高显著。

The characteristics of the electromagnetic compatibility （EMC） test curves are wide frequency bandwidth, spectrum dense overlap, coordinate system of various kinds, which are different from other test curves. For this reason, a data extraction method is proposed according to the image of EMC test curve. The method using the diversity of the image processing method, according to the mathematical formula which is deduced from relationship between the pixel coordinate system and the coordinate distribution in the two-dimensional curve of the image, to traverse scanning the pixels in the effective area within the coordinate of the image, to realize the data extraction of the EMC test curve in image, and MATLAB software is eventually used to realize above function. The data extraction results show that this method with high precision and high efficiency.