Real-time parallel and fully pipelined two-dimensional DCT lattice structures with application to HDTV systems
The authors propose a fully pipelined architecture to compute the 2D discrete cosine transform (DCT) from a frame-recursive point of view. Based on this approach, two real-time parallel lattice structures for successive frame and block 2D DCT are developed. These structures are fully pipelined with throughput rate N clock cycles for an N*N successive input data frame. Moreover, the resulting 2D DCT architectures are modular, regular, and locally connected and require only two 1D DCT blocks that are extended directly from the 1D DCT structure without transposition. It is therefore suitable for VLSI implementation for high-speed HDTV systems. A parallel 2D DCT architecture and a scanning pattern for HDTV systems to achieve higher performance is proposed. The VLSI implementation of the 2D DCT using distributed arithmetic to increase computational efficiency and reduce round-off error is discussed. >