Title :
Synthesis filterbank with low hardware complexity for subband image coding
Author :
Sundsbø, Ingil ; Ramstad, Tor A.
Author_Institution :
Nordic VLSI ASA, Tiller, Norway
fDate :
12/1/1998 12:00:00 AM
Abstract :
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
Keywords :
FIR filters; VLSI; channel bank filters; circuit optimisation; data compression; discrete cosine transforms; filtering theory; image coding; quantisation (signal); transform coding; DCT; FIR filters; Stasinksi algorithm; VLSI complexity; algorithms; discrete cosine transform; filter coefficients; finite impulse response filters; high coding gain; low hardware complexity; quantization; subband image coding; synthesis filterbank; twiddle factors; very large scale integration; Decoding; Discrete cosine transforms; Filter bank; Finite impulse response filter; Frequency; Hardware; Image coding; Quantization; Transform coding; Very large scale integration;
Journal_Title :
Image Processing, IEEE Transactions on
