Fig. 1. Schematics of wine seal ring. (a) Top view; (b) front view

Fig. 2. Schematic of mechanical structure of online detection system for wine seal ring

Fig. 3. Schematic of dual-field and dual-station collaborative online detection

Fig. 4. Original images of wine seal ring. (a) Traditional imaging; (b) LC1 acquisition imaging; (c) LC2 acquisition imaging

Fig. 5. Flowchart of wine seal ring recognition and defect detection algorithm

Fig. 6. Outline of wine seal ring. (a)(c)(e)(g) Binary graph; (b)(d)(f)(h) boundary curve

Fig. 7. Contour decomposition of wine seal rings using different basis wavelets. (a) Loading signal; (b) db1 wavelet; (c) db3 wavelet; (d) db4 wavelet

Fig. 8. Decomposition coefficients of wine seal ring contours at different scales of db3 wavelet. (a) The fourth layer; (b) the third layer; (c) the second layer; (d) the first layer

Fig. 9. Effects of wine seal ring detection for different defect detection methods. (a) Original graph; (b) wine seal ring profile; (c) curvature method; (d) derivative method; (e) wavelet modulus maximum method

Fig. 10. Time-consuming diagram of system detection