Lifting factorization based on block parallel system of M-channel perfect reconstruction filter banks
Taizo Suzuki, Masaaki Ikehara · 2009
Several lifting-based filter banks (LBFBs) are proposed for lossless-to-lossy image coding. However, the conventional methods can not achieve good coding performance due to many rounding operations, and they may have wide dynamic range of lifting coefficients due to inverse matrix. This paper presents a more practical lifting fac-torization of M-channel perfect reconstruction filter bank (PRFB). Using the block parallel system of PRFBs with an imposed condi-tion, we can factorize them into a novel lifting structure which is called the parallel lifting. The validity of our structures is shown by applying them to lossless-to-lossy image coding. Index Terms — Perfect reconstruction filter bank (PRFB), block parallel system, parallel lifting, lossless-to-lossy image coding. 1.