In this paper, we present a fast algorithm for bi-directional conversion between discrete cosine transform (DCT)
coefficients of a signal block and its sub-blocks. Specifically, we show that a DCT of a block of size N x N can be
efficiently obtained from the N/2 x N/2 DCT coefficients of its sub-blocks, and vice versa. The algorithms are
obtained by formulating each unidirectional conversion as a relatively simple combination of N/2 x N/2 DCT
calculations. For typical DCT block sizes our algorithms result in a 20% savings in multiplications over the
fastest existing methods. Simulation results also suggest high accuracy using the proposed conversion scheme.
Conference Committee Involvement (2)
Visual Communications and Image Processing 2009
20 January 2009 | San Jose, California, United States
Visual Communications and Image Processing 2008
29 January 2008 | San Jose, California, United States
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