error: ‘CV_INTER_LINEAR’ was not declared in this scope
OpenCV4部分取消了CV_前缀
解决方法很简单，就是找到报错的文件，报错的变量修改适配 OpenCV4 中的变量。
CV_INTER_LINEAR 修改为 cv::INTER_LINEAR
或者，添加头文件
#include<opencv2/imgproc/imgproc_c.h>
error: ‘CV_RANSAC’ was not declared in this scope
CV_RANSAC 修改为 cv::RANSAC
error: ‘CV_WINDOW_AUTOSIZE’ was not declared in this scope
CV_WINDOW_AUTOSIZE 修改为 cv::WINDOW_AUTOSIZE
或者，添加头文件
#include <opencv2/highgui/highgui_c.h>
error: ‘CV_GRAY2RGB’ was not declared in this scope
#include <opencv2/imgproc/types_c.h>
报错 fatal error: opencv/cv.h: No such file or directory
将报错文件包含的头文件进行修改：
#include <opencv/cv.h>
修改为：
#include <opencv2/imgproc/types_c.h>
fatal error: opencv/highgui.h: No such file or directory
报错文件包含的头文件进行修改：
#include <opencv/highgui.h>
修改为：
#include <opencv2/highgui/highgui_c.h>
error: ‘CV_LOAD_IMAGE_GRAYSCALE’ was not declared in this scope
将报错文件包含的头文件进行修改：
CV_LOAD_IMAGE_GRAYSCALE
修改为：
cv::IMREAD_GRAYSCALE
error: ‘CV_LOAD_IMAGE_COLOR’ was not declared in this scope文章来源：https://www.toymoban.com/news/detail-663695.html
CV_LOAD_IMAGE_COLOR
修改为：文章来源地址https://www.toymoban.com/news/detail-663695.html
cv::IMREAD_COLOR
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