Conclusion

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ATW followed by HPF are best among the six techniques discussed here for image fusion as the output is closest to what is expected had there been a corresponding multisensor observation at the high resolution level of PAN.

Figure 4. Maximum values of the original images and the fused images.

Figure 5.  Standard deviation of the original and the fused images.

TABLE    III. Evaluation of original and fused NIR band by different Methods

	UIQI	CC	Min	Max	Sd
Original NIR	1	1	195	811	87
Fused NIR (ATW)	0.99	0.98	125	867	88.5
Fused NIR (HPF)	0.94	0.99	152	650	68.1