Opencv-python use

Opencv_python use

First, the GUI features in OpenCV:

1. Read in the Image:

The Cv2.imread () function reads into the image. The parameters are:

(1) The path to this picture.

(2) Tell the function how to read the image:

Cv2. Imread_color: Reads a pair of color images. However, the transparency of the image is ignored and can be expressed in 1.

Cv2. Imread_grayscale: Reads the image in grayscale mode, which can be expressed in 0.

Cv2. Imread_unchanged: Reading an image and including the alpha channel of the image, I haven't tried out how to say it.

　　　　　　

1 Import NumPy as NP 2 Import Cv2 3 img=cv2.imread ('F:\python\opencv\pic\kongfu.jpg', 0)

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2. Display Image:

Cv2.imshow () displays the image. The first parameter is the name of the window, followed by the obtained image parameter.

3. Save the Image:

Use the function Cv2.imwrite () to save an image. The first parameter is a file name, followed by the image you want to save.

Summary code:

　　　　　　

1 #The following program will load a grayscale graph, display pictures, press the ' s ' key to save and exit, or press ESC to exit without saving2 ImportNumPy as NP3 ImportCv24Img=cv2.imread ('F:\python\opencv\pic\kongfu.jpg', 0)5Cv2.imshow ('Kung Fu Panda', IMG)6k=cv2.waitkey (0)7 ifK==27:8 cv2.destoryallwindows ()9 elifK==ord ('s'):TenCv2.imwrite ('F:\python\opencv\pic\kongfu.png', IMG) OneCv2.destroyallwindows ()

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Opencv-python use