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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164 Image Enhancement and Correction
the gradient magnitude is maximum. Like the gradient operator, the Lapla-
cian operator can also be approximated by a spatial filter, for example,
h =
0 1 0
1 −4 1
0 1 0
. (5.6)
Its power spectrum is depicted in Figure 5.3. This filter ha s the desired
property of retur ning zero in regions of constant intensity and in regions of
constantly varying intensity (e.g., ramps), but nonzero at their onset or ter-
mination. Laplacian filters tend to be very sensitive to image noise. Often a
low-pass Gauss ian filter is fir st used to smooth the image before the Lapla-
cian filter is applied. This is eq uivalent to calculating ...
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