Image Display and Exploration

ice

Interactive Color Editor.

rgbcube

Displays an RGB cube on the MATLAB desktop.

Image file I/O

movie2tifs

Creates a multiframe TIFF file from a MATLAB movie.

seq2tifs (DIPUM)

Creates a multi-frame TIFF file from a MATLAB sequence.

tifs2movie

Create a MATLAB movie from a multiframe TIFF file.

tifs2seq

Create a MATLAB sequence from a multi-frame TIFF file.

Geometric Transformations

imtransform2

2-D image transformation with fixed output location.

pixeldup

Duplicates pixels of an image in both directions.

pointgrid

Points arranged on a grid.

reprotate

Rotate image repeatedly.

vistform

Visualization transformation effect on set of points.

Image Registration

visreg

Visualize registered images.

Pixel Values and Statistics

localmean

Computes an array of local means.

statmoments

Computes statistical central moments of image histogram.

Image Analysis

bayesgauss

Bayes classifier for Gaussian patterns.

bound2eight

Convert 4-connected boundary to 8-connected boundary.

bound2four

Convert 8-connected boundary to 4-connected boundary.

bound2im

Converts a boundary to an image.

bsubsamp

Subsample a boundary.

bwboundaries

Trace region boundaries in binary image.

colorgrad

Computes the vector gradient of an RGB image.

colorseg

Performs segmentation of a color image.

connectpoly

Connects vertices of a polygon.

cornerprocess

Processes the output of function cornermetric.

diameter

Measure diameter and related properties of image regions.

fchcode

Computes the Freeman chain code of a boundary.

frdescp

Computes Fourier descriptors.

ifrdescp

Computes inverse Fourier descriptors.

im2minperpoly

Minimum perimeter polygon.

imstack2vectors

Extracts vectors from an image stack.

invmoments

Compute invariant moments of image.

localthresh

Local thresholding.

mahalanobis

Computes the Mahalanobis distance.

movingthresh

Image segmentation using a moving average threshold.

otsuthresh

Otsu's optimum threshold given a histogram.

polyangles

Computes internal polygon angles.

principalcomps

Principal-component vectors and related quantities.

randvertex

Adds random noise to the vertices of a polygon.

regiongrow

Perform segmentation by region growing.

signature

Computes the signature of a boundary.

specxture

Computes spectral texture of an image.

splitmerge

Segment an image using a split-and-merge algorithm.

statxture

Computes statistical measures of texture in an image.

strsimilarity

Computes a similarity measure between two strings.

x2majoraxis

Aligns coordinate x with the major axis of a region.

Image Compression

compare

Computes and displays the error between two matrices.

cv2tifs

Decodes a TIFS2CV compressed image sequence.

huff2mat

Decodes a Huffman encoded matrix.

huffman

Builds a variable-length Huffman code for a symbol source.

im2jpeg

Compresses an image using a JPEG approximation.

im2jpeg2k

Compresses an image using a JPEG 2000 approximation.

imratio

Computes the ratio of the bytes in two images/variables.

jpeg2im

Decodes an IM2JPEG compressed image.

jpeg2k2im

Decodes an IM2JPEG2K compressed image.

lpc2mat

Decompresses a 1-D lossless predictive encoded matrix.

mat2huff

Huffman encodes a matrix.

mat2lpc

Compresses a matrix using 1-D lossles predictive coding.

ntrop

Computes a first-order estimate of the entropy of a matrix.

quantize

Quantizes the elements of a UINT8 matrix.

showmo

Displays the motion vectors of a compressed image sequence.

tifs2cv

Compresses a multi-frame TIFF image sequence.

unravel

Decodes a variable-length bit stream.

Image Enhancement

adpmedian

Perform adaptive median filtering.

gscale

Scales the intensity of the input image.

intrans

Performs intensity (gray-level) transformations.

Image Noise

imnoise2

Generates an array of random numbers with a specified PDF.

imnoise3

Generates periodic noise.

Linear Filtering

dftfilt

Performs frequency domain filtering.

spfilt

Performs linear and nonlinear spatial filtering.

Linear 2-D Filter Design

bandfilter

Computes frequency domain band filters.

cnotch

Generates circularly symmetric notch filters.

hpfilter

Computes frequency domain highpass filters

lpfilter

Computes frequency domain lowpass filters.

recnotch

Generates rectangular notch (axes) filters.

Fuzzy Logic

aggfcn

Aggregation function for a fuzzy system.

approxfcn

Approximation function.

bellmf

Bell-shaped membership function.

defuzzify

Output of fuzzy system.

fuzzyfilt

Fuzzy edge detector.

fuzzysysfcn

Fuzzy system function.

implfcns

Implication functions for a fuzzy system.

lambdafcns

Lambda functions for a set of fuzzy rules.

makefuzzyedgesys

Script to make MAT-file used by FUZZYFILT.

onemf

Constant membership function (one).

sigmamf

Sigma membership function.

smf

S-shaped membership function.

trapezmf

Trapezoidal membership function.

triangmf

Triangular membership function.

truncgaussmf

Truncated Gaussian membership function.

zeromf

Constant membership function (zero).

Morphological Operations (Binary Images)

endpoints

Computes end points of a binary image.

Texture Analysis

specxture

Computes spectral texture of an image.

statxture

Computes statistical measures of texture in an image.

Region-Based Processing

histroi

Computes the histogram of an ROI in an image.

Wavelets

waveback  

Performs a multi-level, 2-dimensional inverse FWT.

wavecopy

Fetches coefficients of a wavelet decomposition structure. 

wavecut  

Sets to zero coefficients in a wavelet decomposition structure.

wavedisplay

Display wavelet decomposition coefficients.

wavefast  

Performs a multilevel 2-dimensional fast wavelet transform.

wavefilter

Creates wavelet decomposition and reconstruction filters.

wavepaste  

Puts coefficients in a wavelet decomposition structure. 

wavework

Edits wavelet decomposition structures. 

wavezero  

Sets wavelet detail coefficients to zero. 

Color Space Conversions

hsi2rgb  

Converts HSI values to RGB color space.

rgb2hsi

Converts RGB values to HSI color space.

Array Operations

dftuv

Computes meshgrid arrays.

paddedsize  

Computes the minimum required pad size for use in FFTs. 

Image Types and Type Conversions

tofloat

Convert image to floating point.

Miscellaneous Functions

conwaylaws  

Applies Conway’s genetic laws to a single pixel. 

i2percentile

Computes a percentile given an intensity value.

iseven

Determines which elements of an array are even numbers.

isodd

Determines which elements of an array are odd numbers.

manualhist

Generates a bimodal histogram interactively.

percentile2i

Computes an intensity value given a percentile.

timeit

Measure time required to run function.

twomodegauss

Generates a bimodal Gaussian function.