Fig. 1. Scheme of experimental setup for measuring micro-liquid volumes in transparent tubing based on machine vision

Fig. 2. Experimental setup for measuring micro-liquid volumes in transparent tubing based on machine vision

Fig. 3. Illustration of metrology image data

Fig. 4. Steps of transparent pipeline trajectory fitting method

Fig. 5. K-Means clustering process

Fig. 6. Illustration of neighborhood extraction of trajectory points

Fig. 7. Design of weight function

Fig. 8. Example of weighted neighborhood brightness extraction results for trajectory points

Fig. 9. Example of liquid segment segmentation results in transparent pipeline

Fig. 10. Linear fitting result of calibration metrology

Fig. 11. Grouped error bar chart for calibration measurement method

Fig. 12. Calibration circle extraction in homography matrix measurement method

Fig. 13. Grouped error bar chart for homography matrix measurement method