This work presents a general and formal solution to the problem of fusion of multispectral data with high-resolution panchromatic images. The method relies on the generalised Laplacian pyramid, which is an oversampled structure obtained by subtracting from an image its low-pass version, and selectively performs spatial-frequencics spectrum substitution from an image to another. The novelty of the present work is that a decision based on thresholding the local CC is utilized to check the physical congruence of fusion, while the ratio of local RMSs between the two images provides a space-varying gain factor by which the injected high-pass contribution is equalized. Since the pyramid decomposition is not critically-subsampled, possible impairments in the fused images, due to missing cancellation of aliasing terms, are avoided. Quantitative results are presented and discussed on simulated SPOT 5 data of an urban area (2.5m P, 10m XS) obtained from the MIVIS airborne imaging spectrometer.
Decision-driven pyramid fusion of multispectral and panchromatic images / Aiazzi, B; Baronti, S; Pippi, I; Alparone, L. - STAMPA. - (2003), pp. 273-278. (Intervento presentato al convegno 22nd Symposium of the European-Association-of-Remote-Sensing-Laboratories tenutosi a Prague, Czech Republic nel 4 - 6 June 2002).
Decision-driven pyramid fusion of multispectral and panchromatic images
ALPARONE, LUCIANO
2003
Abstract
This work presents a general and formal solution to the problem of fusion of multispectral data with high-resolution panchromatic images. The method relies on the generalised Laplacian pyramid, which is an oversampled structure obtained by subtracting from an image its low-pass version, and selectively performs spatial-frequencics spectrum substitution from an image to another. The novelty of the present work is that a decision based on thresholding the local CC is utilized to check the physical congruence of fusion, while the ratio of local RMSs between the two images provides a space-varying gain factor by which the injected high-pass contribution is equalized. Since the pyramid decomposition is not critically-subsampled, possible impairments in the fused images, due to missing cancellation of aliasing terms, are avoided. Quantitative results are presented and discussed on simulated SPOT 5 data of an urban area (2.5m P, 10m XS) obtained from the MIVIS airborne imaging spectrometer.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.