基于变径圆的烟丝宽度图像检测方法

Image analyses for tobacco strand width measurement based on circles with different radii

为提高烟丝宽度检测效率与准确性,建立了基于变径圆的烟丝宽度图像检测方法,通过与现有的ISO投影法、Hough变换法进行对比,分析了3种方法在测量烟丝宽度时的准确性和检测效率。结果表明:(1)变径圆算法检测的标准线条宽度与实际宽度的相对误差最大为5%;采用变径圆法和ISO投影法测量30根烟丝,两种方法检测结果在95%置信区间内无显著性差异。(2)以6种烟丝样品作为实验对象,相较于Hough变换法,变径圆法测量结果更接近ISO投影法测量结果。(3)变径圆法检测烟丝宽度10次重复性实验相对标准偏差最大为1.2%;采用变径圆法检测6组烟丝样品宽度平均用时2.5 min,相较于ISO投影法用时的37.0 min检测效率更高,可为烟丝宽度快速检测提供支持。

To improve the measuring efficiency and accuracy of the width of tobacco strands, an image measurement method based on circles with different radii was proposed. By comparing with the existing ISO(International Organization of Standardization) projection method and the Hough transform method, the accuracy and efficiency of the three methods in measuring the width of tobacco strands were analyzed. The results showed that: 1) The maximum relative error of the width of standard strands measured by the proposed algorithm was 5%. There was no significant difference between the widths of 30 strands measured by the proposed method and the ISO projection method at the 95% confidence level. 2) Six tobacco strand samples were tested and compared with the Hough transform method, the measurement results of the proposed method were closer to the results of the ISO projection method. Ten repeatability experiments indicated that the maximum relative standard deviation of the width measured by the proposed method was 0.012%. The average time needed by the proposed method for measuring the width of the six samples was 2.5 min, as compared to 37.0 min used by the ISO projection method. Therefore, this method provides an efficient way for the accurate measurement of the width of tobacco strands.