
Panchromatic sharpening 179
not work with 11- bit data such as IKONOS and QuickBird imagery. Appar-
ently the routines which are invoked from the main menu command expect
byte-encoded pix el intensities. This drawback is remedied in Listing 5.7. The
EVENT para meter in the procedure declaration allows the pr ogram to be called
from the ENVI Classic menu system. Listing 5.8 is an equivalent IDL script
appropriate to the new ENVI user interface.
5.3.2 Brovey fusion
In B
rovey or color normalized fusion (Vrabel, 1996), each r esampled multi-
sp ectral pixel is multiplied by the ratio of the corresponding panchromatic
pixel intensity to the sum of all of