Title :
Adaptive lapped transform-based image coding
Author :
Klausutis, Timothy J. ; Madisetti, Vijay K.
Author_Institution :
Center for Signal & Image Process., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
A structure is presented for implementing perfectly reconstructing time-varying linear-phase paraunitary filterbanks (LPPUFB) using a novel adaptive lapped transform (ALT). The ALT is based on the generalized lapped orthogonal transform (GenLOT). A time-varying filterbank is constructed through the factorization of the GenLOT into cascaded matrix stages. Variable-length lapped transforms are subsequently generated by cascading a number of these matrix stages to build filters of specific length. An embedded ALT image codec is presented.
Keywords :
band-pass filters; codecs; delay circuits; image coding; matrix decomposition; time-varying filters; transform coding; ALT embedded image codec; GenLOT; adaptive lapped transform; cascaded matrix stages; factorization; generalized lapped orthogonal transform; image coding; linear-phase paraunitary filterbanks; perfect reconstruction filterbanks; time-varying filterbank; variable-length lapped transforms; Delay; Discrete cosine transforms; Discrete transforms; Finite impulse response filter; Image coding; Image reconstruction; Matrix decomposition; Performance analysis; Signal processing; Symmetric matrices;
Journal_Title :
Signal Processing Letters, IEEE
