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Table 2 Upper bounds on the number of blocks that can be processed in parallel by an s.p.e.d. 2D-BDCT. indicates a direct or a fast implementation of the DCT. is equivalent to a 16-bit fixed point implementation. and are equivalent to a single precision and a double precision floating point implementations, respectively. We have assumed .

From: Encrypted Domain DCT Based on Homomorphic Cryptosystems

 
4 24 12 12 6 7 3
8 23 8 11 4 7 2
16 22 6 11 3 7 1
32 21 4 11 2 6 1
64 20 4 11 2 6 1