Python Digital Image Processing (2): Image reading, display and saving

Skimage provides an IO module, as the name implies, this module is used for image input and output operations. For the convenience of practice, we also provide a data module with some sample images embedded in it, which we can use directly.

The introduction of the Skimage module is available:

From skimage import io

First, read the picture from the outside and display

Read a single color RGB picture, using skimage.io. The imread (fname) function, with a parameter that represents the path of the file that needs to be read. Show picture Use the skimage.io.imshow(arr) function with a parameter that represents the ARR array to display (the read picture is computed as an array of numpy).

 from Import ioimg=io.imread ('d:/dog.jpg') io.imshow (IMG)

Read a single grayscale image, using Skimage.io. imread (fname,as_grey=true) function, the first parameter is the picture path, the second argument is As_grey, the bool value, the default is False

 from Import ioimg=io.imread ('d:/dog.jpg', as_grey=True) io.imshow (IMG)

Second, the program comes with pictures

The Skimage program comes with some sample pictures, and if we don't want to read the pictures externally, we can use these sample images directly:

a cup of coffee picture text Image

astronaut	astronaut pictures	Coffee	Lena	lena Beautiful pictures
camera	picture of the person taking the camera	coins	coin pictures	Moon	Moon Picture
Checkerboard	checkerboard picture	horse	horse picture	page	page picture
Chelsea	Small Cat pictures	hubble_deep_field	Sky pictures	text
clock	clock picture	immunohistochemis Try	colon picture

These images can be displayed with the following code, without any parameters

 from Import io, dataimg=Data.lena () io.imshow (IMG)

Third, Save the picture

Implemented using the Imsave (Fname,arr) function of the IO module. The first parameter represents the saved path and name, and the second parameter represents the array variable that needs to be saved.

 from Import io,dataimg=Data.chelsea () io.imshow (IMG) io.imsave ('d:/cat.jpg' , IMG)

Iv. Picture Information

If we want to know some picture information, we can display it in the upper right corner of the Spyder Editor:

You can also print the output directly in a procedural way

 fromSkimageImportio,dataimg=Data.chelsea () io.imshow (IMG)Print(Type (IMG))#Display TypePrint(Img.shape)#Display sizePrint(Img.shape[0])#Picture WidthPrint(Img.shape[1])#Picture HeightPrint(Img.shape[2])#number of picture channelsPrint(img.size)#Show total number of pixelsPrint(Img.max ())#Maximum pixel valuePrint(Img.min ())#Minimum pixel valuePrint(Img.mean ())#Pixel Average

Result output:

<class ' Numpy.ndarray ' >
(300, 451, 3)
300
451
3
405900
231
0
115.305141661

Python Digital Image Processing (2): Image reading, display and saving