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Noise reduction in digital images

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Figure

Figure 1:  Image Acquired Using 30 Second Exposure                 Figure 2:  Image Acquired Using 30 Second Exposure
Figure 3:  30 Second Image Acquired 12/98         Figure 4:  30 Second Image Acquired 4/99
Figure 5:  Original 30 Second Image                             Figure 6:  Pixel Substitution
Figure 11 contains the same image seen in Figure 5.   In Figure 12, the noise has been removed by selective medianfiltering
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