SIGNAL RECOVERY FROM SUBBAND ENERGY CONSTRAINTS

Prior knowledge of the subband energy partition of an image is useful for recovering an image from insufficient or noisy data. We consider how such knowledge can be associated with constraint sets and derive two algorithms for image recovery. One constraint assumes knowledge of a reference function, while the other assumes knowledge only of a reference energy. The former leads to an iterative convex projection algorithm, while the latter leads to a generalized projection algorithm. Reasonably good recovery is obtained when the irradiance data are not significantly smoothed and other prior knowledge is sufficiently precise.