基于三维线框模型的类球体农产品体积和表面积测量
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国家自然科学基金项目(61405175)和深圳市战略新兴产业发展专项(JCYJ20150417094158023)


Measurement of Volume and Surface Area for Spheroid Agricultural Product Based on 3D Wire Frame Model
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    摘要:

    为了快速无损测量不规则类球体形状农产品的体积和表面积,提出了基于三维线框模型的图像处理方法。即以Android系统为工作平台,利用Java结合OpenCV函数库,以三维线框模型为理论指导编写包括图像采集、图像分割、体积和表面积计算的应用软件。用3种不同直径的标准球体在6个拍摄距离下进行测量,所获测量值与理论值的误差小于0.3%,表明摄像头自身畸变小,在图像能完整呈现被测物的拍摄距离,被测物轮廓的大小对测量精度的影响在可接受的误差范围之内。用所提方法、排水法和扫描图像处理法对不规则形状的柑橘、苹果、梨各10组进行体积和表面积测量,结果显示3种测量方法的相关系数大于0.98,表明该方法可较精确测量类球体农产品的体积和表面积。

    Abstract:

    This article proposed a new method for fast measurement of the volume and surface area (VSA) of spheroid agricultural products based on 3D wire frame model via image processing using an Android device (AD). The spheroid product counting algorithm software was developed in Java combined with OpenCV library that uses AD to measure the VSA of spheroid agricultural products. The target photos were taken in normal conditions by AD. The image processing was used to get image, segment image, generate binarization image, filter noise, and calculate the VSA according to the coordinate of threedimensional wireframe model. Using this method to measure the ball with different diameters at six distances that between 100mm and 350mm, and the segment spacing was 50mm, which verified that the camera distortion was less than 0.3%, and the contour size of the measured object had scarcely effect on the measurement accuracy. The proposed method was applied to measure the VSA of 10 different citrus, apple and pear, and then all the fruits were measured by drainage method to get their volume and scanning method to attain their surface area. The test result shows that the correlation coefficient among proposed method, drainage method and scanning method was more than 0.98. The results indicated that the introduced method could be utilized as a rapid and nondestructive method for the AD measurement of different spheroid produces of agricultural products.

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龚爱平,张卫正,何 勇,聂鹏程.基于三维线框模型的类球体农产品体积和表面积测量[J].农业机械学报,2016,47(7):338-344. Gong Aiping, Zhang Weizheng, He Yong, Nie Pengcheng. Measurement of Volume and Surface Area for Spheroid Agricultural Product Based on 3D Wire Frame Model[J]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(7):338-344

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  • 收稿日期:2016-03-09
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  • 在线发布日期: 2016-07-10
  • 出版日期: 2016-07-10