EPFL | Biomedical Imaging Group | Approximation Error

Comparison of Wavelets from the Point of View of Their Approximation Error

M. Unser, T. Blu

Proceedings of the SPIE Conference on Mathematical Imaging: Wavelet Applications in Signal and Image Processing VI, San Diego CA, USA, July 19-24, 1998, vol. 3458, pp. 14–21.

We present new quantitative results for the characterization of the L₂-error of wavelet-like expansions as a function of the scale a. This yields an extension as well as a simplification of the asymptotic error formulas that have been published previously. We use our bound determinations to compare the approximation power of various families of wavelet transforms. We present explicit formulas for the leading asymptotic constant for both splines and Daubechies wavelets. For a specified approximation error, this allows us to predict the sampling rate reduction that can obtained by using splines instead Daubechies wavelets. In particular, we prove that the gain in sampling density (splines vs. Daubechies) converges to π as the order goes to infinity.

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AUTHOR="Unser, M. and Blu, T.",
TITLE="Comparison of Wavelets from the Point of View of Their
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