Hardware Architectures for Computing 8-Point Cosine Number Transform
José R. de Oliveira Neto, Juliano Bandeira Lima · 2018
The cosine number transform (CNT) is a cosine-like number-theoretic transform, which has been employed as the basis for multimedia security schemes. In this paper, we propose hardware architectures for computing an 8-point CNT. The architectures include a pipelined approach and are based on a recently introduced fast algorithm, which has been demonstrated to be more efficient than the direct computation of the CNT. We quantify such an efficiency by considering several aspects inherent to modular arithmetic and comparing metrics obtained from field-programmable gate array (FPGA) implementations of the proposed architectures.