A novel wavelet coefficients coding scheme and its FPGA realization

In this paper, a novel shape-adaptive zero tree coding scheme and its hardware realization are presented for the discrete wavelet transform based image compression. The proposed scheme employs a new scanning order and a new symbol set. It features shape adaptive processing, lower coding and memory complexities when compared with the well recognized SPIHT algorithm. The proposed coding scheme is also extended to the 3-D case to handle volumetric data including video sequence. Simulation results indicate that a 4 dB PSNR improvement can be obtained by shape adaptive processing. Its hardwired codec design consumes only 6 K logic gates and an FPGA realization can support a processing rate of 20 1024times1024 sized frames/sec