Journal of Computer Applications ›› 2014, Vol. 34 ›› Issue (3): 846-850.DOI: 10.11772/j.issn.1001-9081.2014.03.0846

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Sheep body size measurement based on computer vision

JIANG Jie,ZHOU Lina,LI Gang   

  1. School of Information Engineering, Inner Mongolia University of Science and Technology, Baotou Nei Mongol 014010, China
  • Received:2013-09-26 Revised:2013-12-02 Online:2014-03-01 Published:2014-04-01
  • Contact: ZHOU Lina



  1. 内蒙古科技大学 信息工程学院,内蒙古 包头014010
  • 通讯作者: 周丽娜
  • 作者简介:江杰(1959-),男,内蒙古包头人,教授级高级工程师,主要研究方向:智能信息处理、人机交互、网格;周丽娜(1988-),女,内蒙古乌兰察布人,硕士研究生,主要研究方向:机器视觉、图像处理;李刚(1983-),男,重庆人,硕士,主要研究方向:图像处理、机器视觉、导航技术、通信技术。
  • 基金资助:



Body size parameters are important indicators to evaluate the growth status of sheep. How to achieve the measurement with non-stress instrument is an urgent and important problem that needs to be resolved in the breeding process of sheep. This paper introduced corresponding machine vision methods to measure the parameters. Sheep body in complex environment was detected by gray-based background subtraction method and chromaticity invariance principle. By virtue of grid method, the contour envelope of sheep body was extracted. After analyzing the contour sequence with D-P algorithm and Helen-Qin Jiushao formula, the point with maximum curvature in the contour was acquired. The point was chosen as the measurement point at the hip of sheep. Based on the above information, the other three measurment points were attained using four-point method and combing the spatial resolution, the body size parameters of sheep body were acquired. And the contactless measurement was achieved. The experimental results show that, the proposed method can effectively extract sheep body in complex environment; the measurement point at hip of sheep can be stably determined and the height of sheep can be stably attained. Due to the complexity of the ambient light, there still exits some problems when determining the shoulder points.

Key words: Body size measuring, Background subtraction, Shadow suppression, Measuring point extraction, Machine Vision



关键词: 体尺测量, 背景差分法, 阴影抑制, 测点提取, 机器视觉

CLC Number: