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Fusion d'images de résolutions spatiales différentes

Claire Thomas 1
1 CEP/Sophia
CEP - Centre Énergétique et Procédés
Abstract : Space-borne sensors such as SPOT, Ikonos or Quickbird, provide images with different characteristics: on one hand, images with high spectral resolution but low spatial resolutions, and on the other hand, images with high spatial resolution combined to low spectral resolution. This work deals with the synthesis of multispectral images at high spatial resolution by the mean of image fusion. Weak approaches to quality assessment were found in literature. Accordingly, we design a protocol for quality assessment based on two previous relevant works. An empirical survey about the changes in quality budget within scales completes the description of the protocol. We propose a categorization of distances found in literature, and add a new distance for geometrical quality assessment, based on the Modulation Transfer Function. It was validated on Ikonos actual imagery and synthesized images obtained by well-known fusion methods. The selection of a group of distances to form quality budgets is discussed in order to obtain a complete overview of the quality reached by fused products. Once the necessary tools of quality assessment built, we focused on the development of new fusion methods. We have chosen the ARSIS concept as framework because of the good quality budgets attained by its different implementations. However, the visual quality of the resulting images is often criticized. A campaign for the assessment of the visual quality of several ARSIS fused products resulted into the identification, the classification and the explanation of several artefacts. This critical study formed the basis for the development of three new methods. They were tested during a second campaign of experimentation. One of the new methods offers better results than that chosen as reference. The image analysts of this second campaign stated that this method was acceptable and recommendable for an operational exploitation within the minister of defence.
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Submitted on : Friday, February 23, 2007 - 8:00:00 AM
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  • HAL Id : pastel-00002097, version 1

Citation

Claire Thomas. Fusion d'images de résolutions spatiales différentes. Mathématiques [math]. École Nationale Supérieure des Mines de Paris, 2006. Français. ⟨NNT : 2006ENMP1399⟩. ⟨pastel-00002097⟩

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