DIPUM Function List


	SUPPORT
	• Students
	• Faculty
	• Problem solutions
	• Errata sheets
	• Review materials
	• Tutorials
	• Image databases
	• Software
	• Projects
	• Publications
	• Links
	• About the authors
	• Adoptions list
	• How to order

DIPUM Toolbox Version 1—Function List

The following is a listing of all the functions in the DIPUM Toolbox, Version 1, along with a short explanation of each function. The functions are organized in roughly the same categories used in the MathWorks' Image Processing Toolbox (IPT). Note that these functions complement the extensive set of functions available in IPT. To see a list that includes all the function in both IPT and the DIPUM Toolbox, refer to Appendix A of the book.

Function	Description
Geometric Transformations
pixeldup	Duplicates pixels of an image in both directions.
vistformfwd	Used to visualize forward geometric transformations.
Pixel Values and Statistics
covmatrix	Computes the covariance matrix of a vector population.
statmoments	Computes statistical central moments of an image histogram.
Image Analysis (Includes Segmentation, Description, and Recognition)
bayesgauss	Bayes classifier for Gaussian patterns.
bound2eight	Converts a 4-connected boundary to an 8-connected boundary.
bound2four	Converts an 8-connected boundary to a 4-connected boundary.
bound2im	Converts a boundary to an image.
boundaries	Traces region boundaries.
bsubsamp	Subsamples a boundary.
colorgrad	Computes the vector gradient of an RGB image.
colorseg	Segments a color image.
connectpoly	Connects vertices of a polygon.
diameter	Measures the diameter of image regions.
endpoints	Compute end points of a binary image.
fchcode	Computes the Freeman chain code of a boundary.
frdescp	Computes Fourier descriptors. (See also ifrdescp.)
hough	Hough transform.
houghlines	Extracts line segments based on the Hough transform.
houghpeaks	Detects peaks in the Hough transform.
houghpixels	Computes image pixels belonging to Hough transform bin.
ifrdescp	Computes inverse Fourier descriptors.
imstack2vectors	Extracts vectors from an image stack.
invmoments	Computes invariant moments of an image.
mahalanobis	Computes the Mahalanobis distance.
minperpoly	Computes minimum perimeter polygons.
polyangles	Computes internal polygon angles.
princomp	Obtains principal-component vectors and related quantities.
randvertex	Randomly displaces polygon vertices.
regiongrow	Performs segmentation by region growing.
signature	Computes the signature of a boundary.
specxture	Computes spectral texture of an image.
splitmerge	Segments 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 axis x with the major axis of a region.
Image Compression
compare	Computes and displays the error between two matrices.
entropy	Computes a first-order estimate of the entropy of a matrix.
huff2mat	Decodes a Huffman encoded matrix.
huffman	Builds a variable-length Huffman code for 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	Decompress a 1-D lossless predictive encoded matrix.
mat2huff	Huffman encodes a matrix.
mat2lpc	Compresses a matrix using 1-D lossless predictive coding.
quantize	Quantizes the elements of an UINT8 matrix.
Image Enhancement
gscale	Scales the intensity values of an image.
intrans	Performs intensity transformations.
Image Noise
imnoise2	Generates an array of random numbers with a specified PDF.
imnoise3	Generates periodic noise.
Linear and Nonlinear Spatial Filtering
adpmedian	Performs adaptive median filtering
dftcorr	Performs frequency domain correlation.
dftfilt	Performs frequency domain filtering.
spfilt	Performs linear and nonlinear spatial filtering.
Linear 2-D Filter Design
hpfilter	Computes frequency domain highpass filters.
lpfilter	Computes frequency domain lowpass filters.
Wavelets
wave2gray	Displays wavelet decomposition coefficients.
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.
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.
Region-Based Processing
histroi	Computes the histogram of an ROI in an image.
Color Image Processing
hsi2rgb	Converts HSI values to RGB color space.
ice	Performs interactive color editing.
rgb2hsi	Converts RGB values to HSI color space.
rgbcube	Displays a color RGB cube.
Array Operations
dftuv	Computes meshgrid arrays.
paddedsize	Computes the minimum required pad size for use in FFTs.
Miscellaneous
changeclass	Changes the class of an image.
conwaylaws	Applies Conway’s genetic laws to a single pixel.
intline	Integer-coordinate line drawing algorithm.
manualhist	Generates a bimodal histogram interactively.
twomodegauss	Generates a bimodal Gaussian function.