June 2014
Intermediate to advanced
576 pages
16h 43m
English
book
Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition
by Morton J. Canty
Content preview from Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition
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194 Image Enhancement and Correction
FIGURE 5.16
As Figure 5.15, e xcept that the right-hand image is after adaptive filtering
with the gamma MAP filter using a 7 × 7 window. (See color insert.)
In regions o f the image where the signal variance var(x) is small compared to
the overall variance (homogeneous regions), i.e., ˆx ≈ ¯g, the pixels intensity
is replaced by the window avera ge. On the other hand, when the true signal
intensity is varying strongly, var(x) ≈ var(g), then ˆx ≈ g and no filtering
takes place at all.
While the overall variance within the window var(g) in Equation (5.42) can
be determined a t once, the signal variance var(x) is not
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