Thesis (PDF) - Signal & Image Processing Lab
Thesis (PDF) - Signal & Image Processing Lab
Thesis (PDF) - Signal & Image Processing Lab
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4.4. RESULTS COMPARISON 59<br />
(a) (b)<br />
Figure 4.17: A Simba image with Salt&Pepper noise cleaned with an combined filter.<br />
Maximal size of structuring element here is 2 × 2. (a) erosion of Noisy <strong>Image</strong> (b)<br />
opening of Noisy <strong>Image</strong><br />
removes dark noise, but cannot reconstruct the thin parts that where damaged by<br />
opening. Closing removes dark noise. Opening after closing removes bright noise, but<br />
cannot reconstruct the parts that where damaged by closing. Median filtering is a<br />
self-dual operator, see Fig. 4.21. Therefore, it is better than open-close and close-open<br />
operators. But, the major drawback of the median filter is that it is not idempotent,<br />
in contrast to opening defined in complete inf-semilattice of AS images.
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