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In this paper, we propose two 16-bit fixed-point IDCT schemes, i.e., the rotation-based approximation and the lifting-based approximation. Both schemes can pass IEEE1180 tests and maintain satisfactory compatibility with the floating-point IDCT. The structures of these two schemes are derived from Loeffler's plane rotation-based factorization of the IDCT matrix. Coefficients in the structures are...
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