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Variable block size adaptive lapped transform-based image coding

A new adaptive lapped transform (ALT) structure is introduced to implement time-varying linear-phase paraunitary and biorthogonal filter banks. The new ALT is based on the generalized lapped transform (GLT). A time-varying filter bank is constructed through the factorization of the GLT into cascaded matrix stages. Variable-length LTs are subsequently generated by cascading a number of these matrix stages to build specific length filters. A fixed and variable block size embedded ALT image codec is presented.