a ID vector, so that the structural information is effectively 
utilized. 
(2) The spatial resolution is greatly improved and the spectral 
information is well preserved in the fused image obtained from 
2DPCA, meanwhile, the color of the fused image is enhanced 
so that the surface features are easily differentiated. 
(3) The performance of 2DPCA-based algorithm outperforms 
PCA-based. 
In conclusion, the theoretical analysis and the experimental 
results above not only prove the validity of the proposed 
method but also the characteristic of the new technique can 
remedy the weakness of PCA-based algorithm to the moment. 
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