Help:Ref wavelet

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Wavelet filter tool

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This tool controls the wavelet filter. This filter "slices", with a series of wavelet, the image into layers of frequencies. The processing is done by amplifying and attenuating layers.

En-wavelet.jpg

To build the wavelet series, you choose the number of wavelets with the numerical field or the stepper. The progression popup allows to choose between an arithmetic or geometric progression ; and the step of the geometric progression can be set. You then should choose the wavelet type, between a wavelet called "frequency sawtooth" a bit more agressive, and the European Southern Observatory (E.S.O.) wavelet, used in most classical wavelet processings. Each frequency can be modified manualy, except for the zero frequency. When a frequency is below the lowest frequency of the image, it is displayed red because the wavelet is unusable. By pressing the "Freq." button, you can start working on the wavelet period (in pixels) instead of the frequency. By pressing again the now "Pixels" button, you come back to frequency. A wavelet can be deleted with the "-" button. A new wavelet can be created with the "+" button. The image layer associated with a wavelet can be visualized in the image frame by using the button between the frequency and the level slider, to display which kind of detail is contained in this layer. The level sliders and numeric fields are used to process the image. Each change is reflected in the image frame.

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