This package contains some MatLab tools for multi-scale imageprocessing.  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).The package is available as a gnu-zipped UNIX "tar" file, accessible from the web page:   http://www.cns.nyu.edu/~lcv/software.htmlThe code works in Matlab versions 4.2 and higher, and has been fully testedon Linux and Macintosh OSX platforms (it should, however, port easily toothers).  To use the code (these lines are for UNIX):  1) gunzip matlabPyrTools.tar.gz  	# unpack g'zipped file  2) tar tvf matlabPyrTools.tar       	# view contents  3) tar xvf matlabPyrTools.tar       	# extract contents  4) rm matlabPyrTools.tar 		# delete tarfile  5) Run matlab, and execute:      path(<pathname-of-matlabPyrTools>, path);      help matlabPyrToolsA few functions are actually MEX interfaces to C code.  These arecontained in the subdirectory called MEX.  The MEX files have beentested on Sun (Solaris), LinuX on a Pentium platform, and MacintoshOSX on a PowerPC, but should not be difficult to compile on most otherplatforms.  Source code is included in the MEX directory, as well asMake files.  I've included pre-compiled versions for a number ofplatforms (Solaris,Linux,Mac,Windows).  To make sure these are in yourmatlab 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.Some example script files showing usage of the code are in thedirectory <dir>/TUTORIALS.  There is a README file in that directorydescribing the contents.Incremental changes to the code are documented in the ChangeLog file.Comments/Suggestions/Bugs to:  Eero P. Simoncelli  Associate Professor,  Center for Neural Science, and  Courant Institute for Mathematical Sciences  New York University  eero.simoncelli@nyu.edu  http://www.cns.nyu.edu/~eero/