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Synthesis filterbank with low hardware complexity for subband image coding

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2 Author(s)
I. Sundsbo ; Nordic VLSI ASA, Tiller, Norway ; T. A. Ramstad

Different algorithms are evaluated and optimizations are performed to obtain a filterbank for subband coding of images especially suited for very large scale integration (VLSI) implementation. Based on a filterbank consisting of two finite impulse response (FIR) filters combined with an 8-point discrete cosine transform (DCT), we investigate how the quantization of filter coefficients and twiddle factors in different algorithms affects the quality of the filterbank. It is found that a DCT based on a Stasinksi (1989) algorithm with twiddle factors of only 5 b together with FIR filter coefficients of 10 b gives a filterbank with high coding gain, no blocking artifacts, and limited ringing. The VLSI complexity is comparable to that of DCT transforms

Published in:

IEEE Transactions on Image Processing  (Volume:7 ,  Issue: 12 )