基于機器視覺的透明軟管內(nèi)微量液體體積測量

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doi：10.37188/OPE.20253305.0763 CSTR：32169.14.OPE.20253305.0763

Machine vision-based method for measuring micro-volume liquid in transparenttubes

WANGHao，LI Xinghui，XIAO Wei，QIANGXiang，WANGXiaohao （Tsinghua Shenzhen International Graduate School， Tsinghua University， Shenzhen 518O05，China） * Corresponding author，E-mail： li. xinghui@sz. tsinghua. edu. cn

Abstract： This study addresses the necessity for rapid and precise measurement of micro-volume liquids （approximately 0.1mL to 0.6mL ）within transparent tubes in industrial production settings.A machine vision-based measurement methodology is proposed，which integrates a specifically designed imaging systemalongside an adaptive neighborhood-weighted brightness analysis algorithm to reliably extract the pixel length of liquid segments. This approach efectively mitigates challenges such as bubble interference，uneven lighting，and reflections from the tube's surface. Two measurement strategies are consequently introduced ：the first is a calibration-based method utilizing static weighing to establish a quantitative model that correlates the pixel length of the liquid segment with the actual volume;the second is a homography-based coordinate transformation method，which translates pixel coordinates into physical space and calculates volume by incorporating the tube's inner diameter. Experimental results indicate that，under complex conditions，the proposed methods achieve measurement accuracies of approximately 98.3% and 98.4% ，thereby satisfying the demands for rapid micro-volume liquid measurement in industrial applications. This methodology demonstrates significant potential for application and offers prospects for widespread adoption.

Key words：machine vision；object segmentation;curve fiting；volume measurement

1引言

微量液體的精確體積測量對于確保產(chǎn)品質(zhì)量、優(yōu)化生產(chǎn)工藝以及實現(xiàn)自動化在線檢測具有至關(guān)重要的作用，尤其是在醫(yī)藥制造、化學合成、生命科學研究、食品飲料加工以及環(huán)境監(jiān)測等工業(yè)領(lǐng)域。（剩余19357字）