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轮廓提取法分析片烟的形状特征

Shape feature analysis of tobacco strips based on contour extraction

  • 摘要: 为准确描述片烟形状特征,采用机器视觉装置并结合数字图像分析法,以形态描述中的矩形度、紧致度、细长度为形状特征指标,建立了片烟形状特征分析方法,比较了不规则片烟样品中大片、中片、小片、碎片形状特征。结果表明:①除图像采集过程片烟力学形变影响外,形状特征指标检测方法相对误差、相对标准偏差均 < 5.0%;②不规则大片、中片到长方形标准片烟的欧氏距离最小,大片、中片形状接近长方形;③不规则小片接近正方形标准片烟,碎片接近圆形标准片烟。通过变换5组不同尺寸标准形状,同一份不规则片烟样品到不同组标准片烟的欧氏距离相对误差、相对标准偏差均 < 5.0%,说明所建立的片烟形状特征分析方法稳定、可靠。

     

    Abstract: In order to describe the shape features of tobacco strips accurately, by combining machine vision device with digital image analysis, an analysis method was developed, wherein the shape of tobacco strip was characterized by rectangular degree, compactness and elongatedness. The shape features of large, middle and small size strips and scraps in random strip samples were compared. The results showed that:1) Except for the influence of the mechanical deformation for tobacco strips in the process of image acquisition, the relative error and relative standard deviation of the developed method were less than 5.0%. 2) The Euclidean distance between large and middle size strips and standard rectangular strips was the shortest, it suggested that the shape of large and middle size strips was close to rectangle. 3) The shape of small size strips was close to standard square strips, that of scraps was close to standard circular strips. The relative standard deviations and relative errors of Euclidean distance of individual strip sample relative to five sets of standardized strips were all less than 5.0%, which indicated that the developed method offered consistent and reliable results.

     

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