totally reflective when switched on, or energised. The reflected sig rial produced by this structure when screen i is switched on and all otber screens are switched off is therefore s,(t) = cos(ot + 2434. The reflected signal s,(t) may also be expressed in terms of in-. phase and quadrature components as sr(t) = cos(wt)cos(2i!3d)s in(cot)sin(2iPd).

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This paper describes reconfigurable geometries for image sensors based on a concentric Cartesian multiresolution lattice modified by four configuration parameters. They allow, without moving the image sensor, to examine any region of the Field of View with the highest available resolution, as well as to select the acuity profile for the regions sorrounding the fovea. The efficient processing of the multiresolution images obtained requires discrete shifts of fovea and rings whose magnitudes are calculated. Real time foveal images have been preprocessed and examples are given.

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