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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110 Transformations
This is the primal problem for P C A (see the discussion of primal and dual
formulations for ridge regressio n in Section 2.6.4). Solution of the primal
problem can be performed directly from the ENVI main menu:
Transform/Principal Components/Forward PC Rotation
The Python and IDL programs in L istings 1.7 throug h 1.10 in Chapter 1
illustrated the procedure ex plic itly.
3.3.3 Dual solution
The normalized eigenvectors of the es tima ted cova riance matrix s a
re w
i
, i =
1 . . . N . These, as explained, are the principal vectors, and we now show how
to express them in terms of the e igenvectors of the Gram matrix GG
⊤
, which
was initia ...
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