[Up] [Image Processing Course] [Functions] [Data Types]

Toolbox ia636 V0.5 10dec2002

Functions
Image Processing Functions

Image Creation

iabwlp	Low-Pass Butterworth frequency filter.
iacircle	Create a binary circle image.
iaramp	Create an image with vertical bands of increasing gray values.
iacos	Create a cossenoidal image.
iagaussian	Generate a 2D Gaussian image.
iaellipse	Generate a 2D ellipse, rectangle or diamond image.
ialog	Laplacian of Gaussian image.
iacomb	Create a grid of impulses image.
iarectangle	Create a binary rectangle image.

Image Information and Manipulation

iaroi	Cut a rectangle out of an image.
iacrop	Crop an image to find the minimum rectangle.
iapad	Extend the image inserting a frame around it.
iatile	Replicate the image until reach a new size.
iaind2sub	Convert linear index to double subscripts.
iameshgrid	Create two 2-D matrices of indexes.
ianeg	Negate an image.
ianormalize	Normalize the pixels values between the specified range.
iasub2ind	Convert linear double subscripts to linear index.

Image file I/O

iaread	Read an image file (PBM, PGM and PPM).
iawrite	Write an image file (PBM, PGM and PPM).

Contrast Manipulation

iaapplylut	Intensity image transform.
iacolormap	Create a colormap table.

Color Processing

iatcrgb2ind	True color RGB to index image and colormap.
iargb2hsv	Convert RGB to HSV color model.
iahsv2rgb	Convert HSV to RGB color model.
iargb2ycbcr	Convert RGB to YCbCr color model.
iaycbcr2rgb	Convert RGB to YCbCr color model.

Geometric Manipulations

iaffine	Affine transform.
iageorigid	2D Rigid body geometric transformation and scaling.
iaresize	Resizes an image.
iaptrans	Periodic translation.

Image Transformation

iadct	Discrete Cossine Transform.
iadctmatrix	Kernel matrix for the DCT Transform.
iadft	Discrete Fourier Transform.
iadftmatrix	Kernel matrix for the DFT Transform.
iafftshift	Shifts zero-frequency component to center of spectrum.
iaifftshift	Undoes the effects of iafftshift.
iahaarmatrix	Kernel matrix for the Haar Transform.
iahadamard	Hadamard Transform.
iahadamardmatrix	Kernel matrix for the Hadamard Transform.
iahwt	Haar Wavelet Transform.
iaidct	Inverse Discrete Cossine Transform.
iaidft	Inverse Discrete Fourier Transform.
iaihadamard	Inverse Hadamard Transform.
iaihwt	Inverse Haar Wavelet Transform.
iaisdftsym	Check for conjugate symmetry

Image Filtering

ialogfilter	Laplacian of Gaussian filter.
iacontour	Contours of binary images.
iaconv	2D convolution.
iapconv	2D Periodic convolution.
iasobel	Sobel edge detection.
iavarfilter	Variance filter.

Automatic Thresholding Techniques

Thresholding by Otsu.

Measurements

iahistogram	Image histogram.
iastat	Calculates MSE, PSNR and Pearson correlation between two images.
iacolorhist	Color-image histogram.
ialabel	Label a binary image.
iarec	Reconstruction of a connect component.

Halftoning Approximation

iadither	Ordered Dither.
iafloyd	Floyd-Steinberg error diffusion.

Visualization

iaisolines	Isolines of a grayscale image.
iadftview	Generate optical Fourier Spectrum for display from DFT data.
ialblshow	Display a labeled image assigning a random color for each label.
iaplot	Plot a function.
iasplot	Plot a surface.
iashow	Image display.
iagshow	Matrix of the image display.

Functions

iaerror	Print message of error.
iaunique	Set unique.
iatype	Print the source code of a function.

[Up] [Image Processing Course] [Functions] [Data Types]