opencv常用API

详见官方文档https://docs.opencv.org/4.x/
配置方法

1. namedWindow()

   • create a window with the name you gave.

   • params:

     • window name: a string. In c, it's a char *.In Python, it's a normal string, like "examples",'examples'
     • window flags: this parameter is used to set the window's size. the default value is cv::WINDOW_AUTOSIZE, when the flag is set as this, the window's size is set automatically depending on the size of the image. other values like WINDOW_NORMAL,WINDOW_FULLSCREEN,WINDOW_FREERATIO,WINDOW_KEEPRATIO are also frequently used.

2. imshow()

   • been used to show an image.

   • params:

     • window name
     • input array: a mat object

3. destoryAllWindows()

   • no params.

4. resizeWindow()

   • params:

     • window name
     • width
     • height

5. waitKey()

   • params:

     delay: int. default value is zero, and the window is always waiting for the pushing of any key.

   • return the key's ASCII code you push.