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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184 Image Enhancement and Correction
5.3.6 A quality index
Several quantitative measures have been suggested for determin
ing the degree
to which the spectral pro perties of the multispectra l bands have been degraded
in the pan-sharpening process (Tsai, 1982). Wang and Bovik (2002) suggest
a particularly simple and intuitive measure of spectral fidelity between two
image bands with pixel intensities repre sented by f and g:
QI =
σ
fg
σ
f
σ
g
·
2
¯
f¯g
¯
f
2
+ ¯g
2
·
2σ
f
σ
g
σ
2
f
+ σ
2
g
=
4σ
fg
¯
f¯g
(
¯
f
2
+ ¯g
2
)(σ
2
f
+ σ
2
g
)
, (5.18)
where
¯
f (¯g) and σ
2
f
(σ
2
g
) are mean, and variance of band f (g) and σ
fg
is the
cova riance of the two bands; see Listing 5.9. The first factor in (5.18) is
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