Concrete Image Segmentation Based on Multiscale Mathematic Morphology Operators and Otsu Method

Figure 6

Comparisons of filtering performance using the above morphological operators with a 3 × 3 cross structuring element.

(a) Original CT image

(b) Image with adding noise

(c) Single opening filter

(d) Single closing filter

(e) Opening followed by closing

(f) Closing followed by opening