This paper addresses the problem of the encrustation of a high spatial resolution imagette into an image of lower resolution of larger geographical extent. A method is proposed which makes use of the high resolution content of the imagette to simulate the high resolution content in the outer periphery of the imagette area. The originality of this approach lies in its ability to simultaneously attenuate the edges caused by the differences in resolution, and increase the quality of the lower resolution image in the outer periphery in the sense that it becomes closer to the actual information at high resolution. These properties are demonstrated both visually and quantitatively. A SPOT satellite image of the city of Barcelona (Spain) provides a didactic example of the problems and solutions as well as of the benefit of encrustation. The increase in quality compared with the standard raw encrustation procedure is quantitatively assessed for both the edge-smoothing and the simulation of the actual information. Unsurprisingly, the proposed approach provides better results than the standard method. It is illustrated by the construction of an albedo map for greater Europe, made up of three different images of different resolutions.
[1]
Lucien Wald,et al.
Fusion d'images SPOT multispectrales (XS) et panchromatique (P), et d'images radar
,
1993
.
[2]
Lucien Wald,et al.
A method for the mapping of the apparent ground brightness using visible images from geostationary satellites
,
1989
.
[3]
Application de la transformée en ondelettes à la simulation d'images spot multispectrales de résolution 10 M
,
1993
.
[4]
Klaus Scharmer.
TOWARDS A NEW ATLAS OF SOLAR RADIATION IN EUROPE
,
1994
.
[5]
Jean-Marie Monget,et al.
Remote sensing of the sea-state using the 0.8-1.1 μm spectral band
,
1983
.
[6]
Thierry Ranchin,et al.
The wavelet transform for the analysis of remotely sensed images
,
1993
.
[7]
Thierry Ranchin,et al.
Efficient data fusion using wavelet transform: the case of SPOT satellite images
,
1993,
Optics & Photonics.