Scheme for regular substitution via VScode.
When encountering an incorrect version of OpenCV

1. Find.

(find_package\(OpenCV).*

1. Replace:

$1 REQUIRED)

1. CV_GRAY2RGB

1. Find:

CV_(.*GRAY[^)]*)

Replace:

cv::COLOR_$1

1. CV_AA
2. Replace:

CV_AA

1. Replace:

cv::LINE_AA

1. CV_CALIB_*

1. Replace:

CV_(CALIB[^ ,)]*)

1. Replace:

cv::$1

1. CV_LOAD_IMAGE_UNCHANGED、CV_LOAD_IMAGE_GRAYSCALE

1. Find:

CV_LOAD_IMAGE_([^ )]*)

1. Replace:

cv::IMREAD_$1

1. Most other issues, just add the header file

1. 1. chessboard.cc Error
   No such file or directory

#include<opencv/cv.h>：

#include <opencv2/imgproc/imgproc_c.h>
#include <opencv2/highgui/highgui_c.h>