From DCT-based to wavelet-based video transcoding algorithm and architecture design

The main advantage of using DWT is to cope with high compression demand and still get good image quality. Nevertheless, most of the image data are discrete-time cosine-transform (DCT) based. For this reason, we propose a DCT-based to DWT-based image transcoder to convert the pre-existent image data. In our paper, we. investigate the inverse discrete-time cosine-transform (IDCT) and DWT mathematical equation in matrix form. In this way, we develop some method to speed up the computation and lower the architecture complexity. We use MATLAB to justify our theoretic study. After software simulation, we use VHDL code and Synopsys to realize our hardware architecture.