Hardware implementation of shape-adaptive discrete wavelet transform with the JPEG2000 defaulted (9,7) filter bank
In this paper, an efficient hardware implementation of two-dimensional shape-adaptive discrete wavelet transform (2-D SA-DWT) with the JPEG2000 defaulted (9,7) filter bank is presented. Two techniques are used to minimize the critical path and the internal buffer size. One technique is the flipping structure which can shorten the critical path of the lifting scheme by flipping multiplier coefficients, rather than pipelining. The other technique is a shape-adaptive boundary handling strategy which can enhance lifting-based architectures to solve boundary extension problems of SA-DWT with little hardware overhead. A prototyping chip of this implementation will be fabricated with TSMC 0.25 /spl mu/m CMOS 1P5M process, and the estimated frequency and the core area are 50 MHz and 2.83 mm/sup 2/, respectively.