Abstract
AbstractThe wavelet-transform based applications and their architecture design have been widely discussed in literature, and already proposed for image compression standard of modern era. The main advantage of using DWT is to cope with high compression demand and still get good image quality. Another advantage is its high scalability. According to these features, DWT- based images are extremely suitable for transmission over the Internet. Nevertheless, most of the image data are DCT-based. For this reason, we propose a DCT-based to DWT-based image transcoder to convert the pre-existent image data.We utilize the matrix operation of given transform matrices to get the new transform matrix and study the transcoding procedures. Accordingly, their architectures are proposed. We design the proposed transcoder based on the principle of pipelining. The proposed architecture can offer two formats of DWT to support the new image standards, such as JPEG2000 and MPEG4. One works on the whole image, and the other on a tile. It can be chosen by user to support different coding ways. According to TSMC 0.35um Cell-library, our design of the mentioned transcoder can achieve 50-MHz working speed with 22305 gate-counts, consuming 62mW of power.