matlabPyrTools

This package contains some MatLab tools for multi-scale image processing. Briefly, the tools include:

• Recursive multi-scale image decompositions (pyramids), including Laplacian pyramids, QMFs, Wavelets, and steerable pyramids. These operate on 1D or 2D signals of arbitrary dimension. Data structures are compatible with the MatLab wavelet toolbox.
• Fast 2D convolution routines, with subsampling and boundary-handling.
• Fast point-operations, histograms, histogram-matching.
• Fast synthetic image generation: sine gratings, zone plates, fractals, etc.
• Display routines for images and pyramids. These include several auto-scaling options, rounding to integer zoom factors to avoid resampling artifacts, and useful labeling (dimensions and gray-range).

Tip

pyrtools is an actively-maintained python port of this code.

Tip

plenoptic contains a GPU-compatible pytorch port of the frequency-domain steerable pyramid.

The code was originally written in Matlab version 4.2, and continues to work in new versions (as of 12/09). To use the code, run matlab, and execute:

addpath(<full-pathname-of-matlabPyrTools>);
help matlabPyrTools

A few functions are actually MEX interfaces to C code. These are contained in the subdirectory called MEX. The MEX files have been tested on Sun (Solaris), LinuX (on an Intel platform), and Macintosh OSX (on PowerPC and Intel), but should not be difficult to compile on most other platforms. Source code is included in the MEX directory, as well as Make files. Pre-compiled versions are included for a number of platforms. To compile on your platform, simply run compilePyrTools.m which is located in the MEX subdirectory.

To make sure these are in your matlab path, you can do one of the following:

1. Create a symbolic link (or macintosh "alias") for the relavent files in the main matlabPyrTools directory, or
2. Copy the relavent files into the main matlabPyrTools directory, or
3. Put the MEX subdirectory in your matlab path: addpath('matlabPyrTools/MEX');

Some example script files showing usage of the code are in the directory TUTORIALS/. There is a README file in that directory describing the contents.

Incremental changes/updates to the code are documented in the ChangeLog file.

Comments/Suggestions/Bugs to:

Eero P. Simoncelli
Center for Neural Science, and
Courant Institute for Mathematical Sciences
New York University
eero.simoncelli@nyu.edu
http://www.cns.nyu.edu/~eero/