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-% Image and Multi-scale Pyramid Tools
-% Version 1.3,  October 2004.
-% Created: Early Spring, 1996. Eero Simoncelli, eero.simoncelli@nyu.edu
-%
-% See README file for brief description.
-% See ChangeLog file for latest modifications. 
-% See TUTORIALS subdirectory for demonstrations.
-% Type "help <command-name>" for documentation on individual commands.
-% -----------------------------------------------------------------
-% Synthetic Images (matrices):
-%   mkImpulse  - Make an image containing an impulse.
-%   mkRamp     - Make an image containing a ramp function.
-%   mkR        - Make an image containing distance from the origin.
-%   mkAngle    - Make an image containing angle about origin.
-%   mkDisc     - Make an image containing a disk image.
-%   mkGaussian - Make an image containing a Gaussian function.
-%   mkZonePlate - Make an image containing a zone plate (cos(r^2)).
-%   mkAngularSine - Make an image containing an angular sine wave (pinwheel).
-%   mkSine     - Make an image containing a sine grating.
-%   mkSquare   - Make an image containing a square grating.
-%   mkFract    - Make an image containing fractal (1/f) noise.
-%
-% Point Operations:
-%   clip       - clip values to a range. 
-%   pointOp    - Lookup table (much faster than interp1) [MEX file]
-%   histo      - Efficient histogram computation [MEX file]
-%   histoMatch - Modify matrix elements to match specified histogram stats.
-%
-% Convolution (first two are significantly faster):
-%   corrDn     - Correlate & downsample with boundary-handling [MEX file]
-%   upConv     - Upsample & convolve with boundary-handling [MEX file]
-%   blurDn     - Blur and subsample a signal/image.
-%   upBlur     - Upsample and blur a signal/image.
-%   blur       - Multi-scale blurring, calls blurDn and then upBlur.
-%   cconv2     - Circular convolution.
-%   rconv2     - Convolution with reflected boundaries.
-%   zconv2     - Convolution assuming zeros beyond image boundaries.
-%
-% General pyramids:
-%   pyrLow     - Access lowpass subband from (any type of) pyramid
-%   pyrBand    - Access a subband from (any type of) pyramid
-%   setPyrBand - Insert an image into (any type of) pyramid as a subband 
-%   pyrBandIndices - Returns indices for given band in a pyramid vector
-%   maxPyrHt   - compute maximum number of scales in a pyramid
-%
-% Gaussian/Laplacian Pyramids:
-%   buildGpyr  - Build a Gaussian pyramid of an input signal/image.
-%   buildLpyr  - Build a Laplacian pyramid of an input signal/image.
-%   reconLpyr  - Reconstruct (invert) the Laplacian pyramid transform.
-%
-% Separable orthonormal QMF/wavelet Pyramids:
-%   buildWpyr  - Build a separable wavelet representation of an input signal/image.
-%   reconWpyr  - Reconstruct (invert) the wavelet transform.
-%   wpyrBand   - Extract a single band of the wavelet representation.
-%   wpyrLev    - Extract (packed) subbands at a particular level
-%   wpyrHt     - Number of levels (height) of a wavelet pyramid.
-%
-% Steerable Pyramids:
-%   buildSpyr  - Build a steerable pyramid representation of an input image.
-%   reconSpyr  - Reconstruct (invert) the steerable pyramid transform.
-%   buildSFpyr - Build a steerable pyramid representation in the Fourier domain.
-%   reconSFpyr - Reconstruct (invert) the (Fourier domain) steerable pyramid transform.
-%   spyrBand   - Extract a single band from a steerable pyramid.
-%   spyrHigh   - Highpass residual band.
-%   spyrLev    - A whole level (i.e., all images at a given scale) of a steerable pyramid.
-%   spyrHt     - Number of levels (height) of a steerable pyramid.
-%   spyrNumBands - Number of orientation bands in a steerable pyramid.
-%
-% Steerable filters / derivatives:
-%   imGradient - Compute gradient of image using directionally accurete filters.
-%   steer      - Steer filters (or responses).
-%   steer2HarmMtx - Construct a matrix mapping direcional basis to angular harmonics. 
-% 
-% Filters:
-%   binomialFilter  - returns a filter of binomial coefficients.
-%   namedFilter     - some typical Laplacian/Wavelet pyramid filters
-%   spNFilters      - Set of Nth order steerable pyramid filters.
-%   derivNFiltersS  - Matched set of S-tap 1D derivatives, orders 0 to N.
-% 
-% Display:
-%   showIm     - Display a matrix (real or complex) as grayscale image(s).
-%                Displays dimensions, subsampling, and range of pixel values.
-%   showLpyr   - Display a Laplacian pyramid.
-%   showWpyr   - Display a separable wavelet pyramid.
-%   showSpyr   - Display a steerable pyramid.
-%   lplot      - "lollipop" plot.
-%   nextFig    - Make next figure window current.
-%   pixelAxes  - Make image display use an integer number of pixels 
-%                per sample to avoid resampling artifacts.
-% 
-% Statistics (for 2D Matrices):
-%   range2     - Min and max of image (matrix) [MEX file]
-%   mean2      - Sample mean of an image (matrix). 
-%   var2       - Sample variance of an image (matrix). 
-%   skew2      - Sample skew (3rd moment / variance^1.5) of an image (matrix). 
-%   kurt2      - Sample kurtosis (4th moment / variance^2) of an image (matrix). 
-%   entropy2   - Sample entropy of an image (matrix).
-%   imStats    - Report sample statistics of an image, or pair of images.
-%
-% Miscellaneous:
-%   pgmRead    - Load a "pgm" image into a MatLab matrix [try einstein.pgm,feynman.pgm]
-%   pgmWrite   - Write a MatLab matrix to a "pgm" image file.
-%   shift      - circular shift a 2D matrix by an arbitrary amount.
-%   vectify    - pack matrix into column vector (i.e., function to compute mtx(:)).
-%   ifftshift  - inverse of MatLab's FFTSHIFT (differs for odd-length dimensions)
-%   rcosFn     - return a lookup table of a raised-cosine threshold fn.
-%   innerProd  - Compute M'*M efficiently (i.e., do not copy) [MEX file]