Some tutorials:
| Function / token | Purpose |
|---|---|
| % | Comment |
| ; | Stops echoing to screen |
| clc | Clear screen |
| clear | Clears allocated variables |
| whos | shows information about allocated variables |
| close | Closes the latest open plots or figure |
| close(x) | Closes the plot or figure #x |
| close all | Closes all open plots & figures |
| figure | creates a new figure (graph window) |
| figure(x) | creates a new figure (graph window) and assigns it id #x |
| unit8(x) | explicitly casts x to the uint8 type |
| double(x) | explicitly casts x to the double type |
| [m n] = size(x) | retrieves the matrix / image dimensions of x |
| zeros(m,n) | creates a matrix if dimension m x n filled with zeros |
| ones(m,n) | creates a matrix if dimension m x n filled with ones |
| imread(filename) | reads an image from disc |
| imwrite(x,filename) | writes image x to disc |
| help x | displays matlabs help for function x |
| ind2gray | converts an index based image to grayscale |
| rgb2gray | converts an RGB image to grayscale |
| subplot(m,n,nr) | creates a subplot in a figure |
| conv2(x,y) | 2D convolution of x & y |
| medfilt2(x) | 2D median filtering of x |
| hist(x) | computes the histogram of x |
| histeq | computes the histogram equalization of x |
| imcrop(x,[]) | crops an image to specified dimensions |
| x = [... ; ... ; ...]; | create matrix x |
| m(y,x) | access element x,y in matrix m |
| for a : b | for-loop, loops from a to b |
| for a : stepSize : b | for-loop, loops from a to b with specified step size |
| end | end loop |
| fft2 | computes the 2D Fourier transform using FFT (also pads image) |
| ifft2 | computes the inverse 2D Fourier transform using FFT (does not crop the resulting image) |
| fftshift | shifts the Fourier spectrum |
| abs(x) | returns the absolute value of a x (can be used for Fourier spectras) |
| angle(x) | computes the phase angle of x |