Wavelet transform

Performs a Discrete Wavelet transform on an image. This section assumes the reader is familiar with the theory and uses of wavelet transforms. Good introductions to wavelets can be found in Starck et al. [8] and Prasad and Iyengar [9].

Procedure

1. Select a wavelet. This is a file such as b4_0.0.wavelet . A variety of wavelets are installed in /usr/local/lib/wavelets when tnimage is installed. This step is not necessary for Laplacian wavelet transforms.
2. Check that the image number is correct.
3. Checking ``Show Grid'' will draw lines demarcating the boundaries of each wavelet resolution.
4. Select algorithm. Currently only ``pyramidal'' and ``Laplacian'' are supported.
5. Click ``Forward'' or ``Reverse'' to perform the wavelet transform. The image is automatically converted to grayscale and resized to the next higher power of two in each dimension if necessary.