基于机器视觉的条码尺精确测量技术在落纱小车中的应用

doi:10.3969/j.issn.1000-1158.2019.03.10

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摘要针对自动络筒机落纱小车自主开发需求,设计出一种基于机器视觉的条码尺精确测量技术检测落纱小车在轨道上的位置。该测量方法以条码尺为基准,条码尺由刻度尺和条形码组成。实验中首先在相机初始位置对相机与条码尺进行标定,相机移动过程中实时获取当前对应条码尺图像,计算出当前条码尺坐标,从而计算出相机相对于条码尺的位移。结果表明:该测量方法无累积误差,实现了小车在行走过程中位置的实时监测。相机帧频为30 Hz、物距为15 cm时,输出图像分辨率为640×480像素;小车运行速度小于2 cm/s时,条码尺坐标测量误差小于1 mm;速度在2~6 cm/s之间时,条码尺坐标测量误差为1~2 mm;速度为6~10 cm/s时,条码尺坐标测量误差为2~3.5 mm。该方法能够满足落纱小车低速运行情况下定位精度的要求。

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	马丹丹
	王鹏程
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关键词 ：计量学, 条码尺, 机器视觉, 坐标测量, 落纱小车, 定位精度, 射频识别

Abstract：Aiming at the self-development requirement of the automatic doffer, a bar code scale measurement technique based on machine vision is designed to detect the position of the doffing vehicle in the track. The measurement method is based on the barcode scale which consists of a scale and barcode. In the experiment, the camera and the barcode scale are calibrated at the initial position of the camera. In the process of camera movement, the current corresponding barcode scale image is obtained, and the current barcode coordinates are calculated to get the displacement of the camera relating to the barcode scale. The results show that the measurement method has no error accumulation, and realizes the real-time monitoring of the vehicle during the walking process. When the frame frequency is 30 Hz, the object distance is 15 cm, the output image resolution is 640×480 pixels, and the running speed of the vehicle is less than 2 cm/s, the barcode coordinate measurement accuracy is less than 1 mm. When the speed of the vehicle is 2~6 cm/s, the coordinate measurement accuracy is 1~2 mm, when the speed of the vehicle is 6~10 cm/s, the coordinate measurement accuracy is 2~3.5 mm. The method can meet the requirement of positioning precision of a doffing cart under low-speed running conditions.

Key words： metrology barcode scale machine vision coordinate measurement doffing vehicle positioning precision radio frequency identification

收稿日期: 2017-09-01 发布日期: 2019-04-19

PACS:

TB921

基金资助:江苏高校优势学科建设工程资助项目(PAPD); 江南大学自主科研项目(JUSRP51417B)

通讯作者: 刘基宏(1969-),男,江南大学教授,博士,研究方向为纺织系统开发、纺织智能检测技术。Email: liujihongtex@hotmail.com E-mail: liujihongtex@hotmail.com

作者简介: 马丹丹(1992-),女,安徽宿州人,江南大学硕士研究生,研究方向为新型纺织工艺与装备。Email: 459419604@qq.com

引用本文:

马丹丹,王鹏程,刘基宏. 基于机器视觉的条码尺精确测量技术在落纱小车中的应用[J]. 计量学报, 2019, 40(3): 409-415.
MA Dan-dan,WANG Peng-cheng,LIU Ji-hong. Application of Accurate Measurement Technology of Barcode Scale in Doffing Vehicle Based on Machine Vision. Acta Metrologica Sinica, 2019, 40(3): 409-415.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2019.03.10 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2019/V40/I3/409