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Table 1 Upper bounds (in bits) on the output values of s.p.e.d. 2D-DCTs having different size. is equivalent to a 16-bit fixed point implementation. and are equivalent to a single precision and a double precision floating point implementations, respectively. A square 2D-DCT has been considered.

From: Encrypted Domain DCT Based on Homomorphic Cryptosystems

 
64 51 201 93 453 151 801
256 55 265 97 601 155 1065
1024 59 329 101 749 159 1329
4096 63 393 105 897 163 1593