Assimilation of images
Assimilation of images
This chapter describes processes for direct assimilation of images. Among data available for assimilation, a significant portion can be considered as images or image sequences, i.e. structured and dense-in-space information. In meteorology, such observations are often obtained from spaceborne devices and are therefore expensive to acquire. Moreover, images contain information about system dynamics through the time evolution of a sequence or within the structures that are represented (fronts, filaments, etc.). Therefore, images are a valuable source of information. Historically, they have been assimilated by pseudo-observation, where part of the dynamical information is extracted by image processing techniques and then assimilated as conventional observations. This approach has proven quite effective, but the pre-processing renders error specification cumbersome and leads to loss of information. More recently, research has been carried out to assimilate images directly in the assimilation process; two of these proposed approaches are presented and discussed in this chapter.
Keywords: image, direct assimilation, system dynamics, time evolution, dynamical information
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