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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142 Filters, Kernels and Fields
Listing 4.4: Application of two iterations of the discre te wavelet transform to
an image band with the object class DWT.
1 PRO E X4_4
2
3 envi_se lect , title = ’ C hoose multispe ctral band ’, $
4 fid = fid , dims = dims , pos = pos , / band_ only
5 IF ( fid EQ -1) THEN BEGIN
6 PRINT , ’ c ancell ed ’
7 RETURN
8 ENDIF
9
10 ; get the ima ge band from ENVI
11 g = en vi_get _dat a ( fid = fid , dims =dims , pos = pos [0])
12 ; crea te an ins tance of the DWT cl ass with ima ge band
13 aDWT = Obj _New ( ’ DWT ’, g )
14 ; a pply the f ilter bank once
15 aDWT -> filter
16 ; retu rn the resul t to ENVI
17 envi_e nter_d ata , aD
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