[Opencv-python] cv2.imwrite(...) save image

1. Background

For related blogs that have been published, please click to read:
[opencv-python] cv2.imwrite saves jpg and png images
https://blog.csdn.net/jn10010537/article/details/108936584

[Opencv-python] cv2.imwrite saves BMP bitmap
https://blog.csdn.net/jn10010537/article/details/106317471

Cv2's interface for saving images:

cv2.imwrite(filename, img[, params]) -> retval

For detailed documentation, please check