Fusion of multispectral and panchromatic images as an optimization problem

In this chapter, different approaches to image fusion for pan-sharpening of multispectral images are presented and critically compared. Particular emphasis is devoted to the advantages resulting from defining pan-sharpening as an optimisation problem. Implementation issues are also considered and extensive results in terms of quality of the fused products, both visual and objective, and computational time comparisons are presented for classical, state-of-the-art, and innovative solutions.