2-D Discrete Wavelet Decomposition

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Instructions

This application shows the Discrete Wavelet Transform (DWT) decomposition of a given input image and allows you to add artificially generated noise and blur. Next, it allows you to play with soft/hard thresholding functions.

The input image can either be an pre-loaded image (the classical zone plate image, Shepp-Logan phantom, circle) or loaded from a file. Please be aware that this last feature may not work in the webbrowser due to security restrictions as hard disk access is required. On the left side, you can select:

The wavelet filter used for the first (i.e. finest) scale of the transform.
- db1-db16: Daubechies wavelet filters.
- sym1-sym16: Symlet wavelet filters.
- coif1-coif5: Coiflet wavelet filters.

On the right side, you can choose the number of scales of the transform.

References

[1] I. Daubechies, "Ten Lectures on Wavelets," CBMS-NSF Lecture Notes nr. 61, SIAM, 1992.