Passive Optical Data Processing

This chapter introduces a series of techniques specific to the processing of passive optical images, e.g. multi- and hyperspectral images. The following operations are studied: (1) merging panchromatic images with multispectral images (or pansharpening), (2) extracting indices specific to a given application and (3) extracting two types of products - land use maps and subpixel mixture maps. The chapter explains two families of texture indices: the occurrence indices and the co-occurrence indices. The occurrence indices are calculated directly on the values of the pixels composing the moving window around the pixel considered. Co-occurrence considers the spatial information between pairs of pixels in a given window. Two families of geometrical indices of surfaces are considered: those resulting from mathematical morphology and those based on attribute profiles. The chapter talks about the classification maps and the subpixel mixture maps.