8 October 2007 From 16-bit to high-accuracy IDCT approximation: fruits of single architecture affliation
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Abstract
In this paper, we demonstrate an effective unified framework for high-accuracy approximation of the irrational co-effcient floating-point IDCT by a single integer-coeffcient fixed-point architecture. Our framework is based on a modified version of the Loeffler's sparse DCT factorization, and the IDCT architecture is constructed via a cascade of dyadic lifting steps and butterflies. We illustrate that simply varying the accuracy of the approximating parameters yields a large family of standard-compliant IDCTs, from rare 16-bit approximations catering to portable computing to ultra-high-accuracy 32-bit versions that virtually eliminate any drifting effect when pairing with the 64-bit floating-point IDCT at the encoder. Drifting performances of the proposed IDCTs along with existing popular IDCT algorithms in H.263+, MPEG-2 and MPEG-4 are also demonstrated.
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Lijie Liu, Lijie Liu, Trac D. Tran, Trac D. Tran, Pankaj Topiwala, Pankaj Topiwala, } "From 16-bit to high-accuracy IDCT approximation: fruits of single architecture affliation", Proc. SPIE 6696, Applications of Digital Image Processing XXX, 669612 (8 October 2007); doi: 10.1117/12.740216; https://doi.org/10.1117/12.740216
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