Implementation of rectangular windowed odd discrete cosine transform update algorithm using distributed arithmetic approach

The DCT transform has been extensively used in various digital image coding schemes and image compression standards. In this paper, VHDL implementation of Odd Discrete Cosine Transform (ODCT-II) coefficient computation using independent update algorithm is discussed. By independent, we mean ODCT coefficient computation of shifted data sequence doesn´t require ODST coefficients of previous data. The running input data sequence is sampled using a rectangular window. The independent update algorithm is used to compute the transform coefficients of the shifted sequence using Distributed Arithmetic (DA) approach. The design is synthesized using ISE 10.1 and implemented on Vertex 4. Implementation shows that DA based approach is more efficient in terms of device utilization.