Restart ImageJ to add the “A trous filter” command to the Plugins menu.
This plugin’s purpose is to remove noise from noisy images. It makes use of image reconstruction from
thresholded ‘A trous’ wavelet transform coefficients. Thresholding factors should be input in the dialog,
and will influence the amount of noise removed. An image with the removed noise can be generated.
Finding adequate factors is critical to remove sufficient noise without affecting signal,
and these factors may vary from one image type to another. A major advantage of the ‘a trous’ transform
often used in multiscale analysis over e.g. the Haar transform is to avoid introduction
of blocks artifacts.
Holschneider, M., Kronland-Martinet, R., Morlet, J., and Tchamitchian, Ph., 1989. A real-time algorithm for signal analysis with the help of the wavelet transform. In J.M. Combes, A. Grossman and Ph. Tchamitchian, Eds., Wavelets: Time-Frequency Methods and Phase Space (Berlin: Springer-Verlag), pp. 286-297.
Shensa, M.J., 1992. Discrete Wavelet Transforms: Wedding the a trous and Mallat algorithms. IEEE Transactions on Signal Processing, 40, pp. 2,464-2,482.
Starck, J.-L., Murtagh, F., and Bijaoui, A., 1998. Image Processing and Data Analysis: The Multiscale Approach (Cambridge: Cambridge University Press).
‘A trous’ algorithm adapted from Image Processing and Pattern Recognition by Jon Campbell and Fionn Murtagh.
Noise removal algorithm adapted from Multiscale Analysis Methods in Astronomy and Engineering by Jean Luc Starck and Fionn Murtagh.
This filter is macro-recordable, see the Haar wavelet filter for details.
Author: Werner Bailer (firstname.lastname@example.org) Date: 2001/10/29 Source: DCT_.java Installation: Download DCT_.class and DCT.class to the plugins folder and restart ImageJ. Description: Calculates forward and inverse
Authors: Olivier Marchal (marchal_olivier at hotmail.fr) and Jerome Mutterer (jerome.mutterer at ibmp-ulp.u-strasbg.fr) History: 2005/01/20: First version 2005/02/08: Improved version Limitations: Only works with 8-bit images
Authors: Christopher Philip Mauer (cpmauer at northwestern.edu) Vytas Bindokas (vytas at drugs.bsd.uchicago.edu) History: 2004/07/15: First version 2007/10/26: Fixed batch mode NullPointerException bug Limitations: Only works