Common basic functions of MATLAB Image Processing

Previously, when we used MATLAB for image processing, we used the functions to check the functions. We never summarized them systematically, but we had to check them again. Therefore, it is necessary to summarize them ~

For convenience, only the function names and basic usage are listed here. Unless otherwise specified, the parameters are not described in detail. HelpAnd DocStrive for continuous updates ~ ****** ******************************* Image reading

Requirement	Function	Description
Read images from a specific path	F =Imread(Filename)	By default, the current search path includes the current path. Files Not in the search path must be specified.
Open dialog box select image file and read	[Filename, pathname, filterindex] =Uigetfile({'*. JPG ;*. TIF ;*. PNG ;*. GIF ', 'all image files ';'*. * ', 'all files'}, 'dialogtitle ','. \ '); F =Imread([Pathname, filename]); or F =Imread(Fullfile(Pathname, filename ));	See the documentation on the left. Note that you can splice the path and file name and determine whether a file is selected, for example, if isequal (filename, 0)

View image information

Requirement	Function	Description
Image Size	Ans =Size(F)	Ans as vector
Image Size, size, and Data Type	WhosF	None
Show more information	Iminfo('Bird.jpg ')	None

Image Display

Requirement	Function	Description
Most common image display	Display image:Imshow(F) G: imshow (f, g) Specify the gray level range: imshow (F, [low, high]) Automatic Adjustment: imshow (F, [])	Imshow (F, []) compresses the double type to [0, 1 ],
Histogram	Imhist (F, bins)	None
Figure display	Figure,Subplot(M, n, p), imshow (f)	M * n blocks, position P
Color Map	Colormap	For more information, see help.
Color Bar	Colorbar	For more information, see help.
Other displays (not commonly used)	Imscr Image	For more information, see help.

Image Storage

Save the image as a file	Imwrite(F, 'filename ') Imwrite (F, 'filename', 'ext ') Imwrite (F, 'filename', 'qc ', q)	Q indicates the image quality, from 0 to 100. The smaller the Q, the larger the compression degree.
Save figure as an image	Saveas(Figure_handle, filename, fileformat) Print(Figure_handle, filename, fileformat)	Fileformat is the storage format

Common functions

Normalization, etc.	G =Mat2gray(F) G =Im2uint8(Mat2gray(F ))	Mat2gray maps F to the [0, 1], double type
Reshape	G =Reshape(F, m, n)	The number of elements in the matrix is not changed, and the size is changed with column priority.
Generate coordinates	[C, R] =Meshgrid(C, R)	Generate a matrix coordinate Array
Copy and splice a Matrix	B =Repmat(A, sz1, sz2,... szn)	None
Apply function to each cell in CELL ARRAY	[A1,..., am] =Cellfun(Func, C1,..., CN, name, value)	My favorite !! See Doc
Generate random number	Random Number Generation ControlRNG Uniform Distribution r =Rand(Size) Even distribution (integer) r =Randi(100,1, 5) Normal Distribution r =Randn(Size) Random NumberRandom	See Doc

Functions to complete specific image processing tasks ;......

Common basic functions of MATLAB Image Processing