A multi-start algorithm for signal adaptive subband systems (image coding)
A method for optimizing the filter coefficients of signal adaptive subband systems, in which the polyphase transfer matrix is paraunitary, using a mean-squared-error criterion is proposed. An efficient algorithm was developed for locating numerous local optima in the coefficient space, permitting a degree of confidence in the location of globally optimal or near-optimal solutions. Both separable systems and a particular class of nonseparable filter systems are studied. The application of the algorithm to a number of images is described.<<ETX>>