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In this paper, a high throughput multiple transform architecture for H.264 Fidelity Range Extensions (FRExt) is proposed. New techniques are adopted which (1) regularize the 8 × 8 integer forward and inverse DCT transform matrices, (2) divide them into four 4 × 4 sub-matrices so that simple fast butterfly algorithm can be used, (3) because of the similarity of the sub-matrices, mixed butterflies are proposed that all the sub-matrices of 8 × 8 and matrices of 4 × 4 forward DCT (FDCT), inversedoi:10.5573/jsts.2007.7.4.247 fatcat:oebohksdkvgzhn4empssiesv6m