Fig. 1. Flow chart of the proposed method

Fig. 2. Extraction process of the region of interest from the internal texture image of glass. (a) Original image; (b) Canny binary image; (c) binary image after multiple morphological operations; (d) approximate rectangular outline; (e) region of interest

Fig. 3. Process of image correction. (a) Original image; (b) progressive probabilistic Hough transform; (c) filtered straight lines; (d) corrected image

Fig. 4. Non-local means denoised image. (a) Region of interest; (b) denoised image

Fig. 5. Comparison between before and after multi-scale detail enhancement. (a) Image before enhancement; (b) image after enhancement

Fig. 6. Right upper vertex and left upper vertex of the internal texture of glass in the region of interest

Fig. 7. Original images to be stitched. (a) Left image to be stitched; (b) right image to be stitched

Fig. 8. Feature points to be matched. (a) Feature points of the left image to be stitched; (b) feature points of the right image to be stitched

Fig. 9. Stitching results of internal texture images of glass

Fig. 10. Complete internal texture image of glass