| Wavelet Toolbox | |
De-noising Images
The purpose of this example is to show how to de-noise an image using both a two-dimensional wavelet analysis and a two-dimensional stationary wavelet analysis. De-noising is one of the most important applications of wavelets.
The image to be de-noised is a noisy version of a piece of the following image.
For this example, switch the extension mode to symmetric padding using the command:
dwtmode('sym')
Open the Wavelet 2-D tool, select from the File menu the Load Image option and select the MAT-file noiswom.mat, which should reside in the MATLAB directory toolbox/wavelet/wavedemo.
The image is loaded into the Wavelet 2-D tool. Select the haar wavelet and select 4 from the level menu, and then click the Analyze button.
The analysis appears in the Wavelet 2-D window.
Click the De-noise button (located at the middle right) to bring up the Wavelet 2-D -- De-noising window.
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