IBTC-DWT Hybrid Coding of Digital Images

In this paper, we propose a hybrid IBTC-DWT encoding a digital image. The method combines the simple computation and edge preservation prosperities of interpolative block truncation coding(IBTC) and high compression ratio of discrete wavelet transform(DWT), implemented with significantly lower coding delay than DWT alone, and to achieve a reduced bit rate is also proposed and investigated. In this hybrid IBTC-DWT algorithm, the resulting high-means and low-means sub images from IBTC algorithm are coded using DWT transform. Simulation results showed that good performance was demonstrated in terms of compression ratio, bit rate and reconstruction quality. It is generally shown that this IBTC-DWT algorithm gives good quality reconstructed images at low bit rate compared to IBTC-DCT algorithm. Key-Words: Images Compression, Block Truncation Coding, Discrete Wavelet Transform.