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- % matlabPyrTools: Image and Multi-scale Pyramid Tools
- % Version: 1.4, December-2009.
- % Created: Early Spring, 1996.
- % Author: 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 matlabPyrTools" to see this file as documentation.
- % 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]
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