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A Generalized Approach to Linear Transform Approximations with Applications to the Discrete Cosine Transform

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Figure

Figure 2: Three problems addressed in this paper: (1) estimation of optimal approximation for single input, (2) estimation of optimaltransform approximation for input set, and (3) real-time adaptive approximation framework through selecting operating points on theconditional complexity distortion function.
Figure 6: The figure shows the speedup of the approximate 2Dwith triangular pruning when compared to the baseline, the exact2D DCT (544 operations)
Figure 7: Iteration for optimal multiple selection.
Figure 11: Optimal operating point selection along the conditionalimage that is obtained by using exact inverse DCT on the DCTtriangle pruning and Haar wavelet basis projection) for Lena image256complexity distortion function (CCDF) using DCT approximation

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