1. A method for processing information signals representative of data describing at least features of interest occurring in a predetermined three-dimensional space, comprising the steps of: (a) generating a matrix from the information signals and each matrix entry is representative of a scaled value associated with a location in the three-dimensional space, with the matrix being representative of at least a selected two-dimensions of the three-dimensions of the predetermined three-dimensional space; (b) compressing the matrix entries to form compressed signals; (c)(1) selectively modifying the compressed signals to enhance certain predetermined compressed signals and suppress certain other compressed signals, with the modified compressed signals being representative of the matrix entries that have been at least enhanced and suppressed, with the modifying step being adapted for detecting changes in successive data obtained for processing.