OpenCV4 报错error：‘ CV_* ’was not declared in this scope 解决方法汇总

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已于 2023-05-06 16:57:24 修改

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分类专栏：杂七杂八文章标签： opencv 计算机视觉

于 2023-05-06 16:56:35 首次发布

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文章总结了在使用OpenCV4.5.2时遇到的CV_*未声明的错误，提供了解决方案，包括添加对应的头文件，如<imgproc_c.h>，<calib3d_c.h>，以及将旧的CV_常量替换为cv::新常量，如CV_THRESH_BINARY_INV替换为cv::THRESH_BINARY_INV等。

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最近用opencv4.5.2配vins，总是报错，每次都要改一大堆，在此总结

OpenCV4 报错error：‘ CV_* ’was not declared in this scope 解决方法汇总

CV_AA

error: ‘CV_AA’ was not declared in this scope

在头文件中添加 #include <opencv2/imgproc/imgproc_c.h>

CV_CALIB_CB_ADAPTIVE_THRESH

error: ‘CV_CALIB_CB_ADAPTIVE_THRESH’ was not declared in this scope

在头文件中添加 #include <opencv2/calib3d/calib3d_c.h>

CV_GRAY2BGR

error: ‘CV_GRAY2BGR’ was not declared in this scope

在头文件中添加 #include <opencv2/imgproc/types_c.h>，或者改成cv::COLOR_GRAY2BGR

CV_THRESH_BINARY_INV / CV_CHAIN_APPROX_SIMPLE / CV_RETR_CCOMP / CV_FONT_HERSHEY_SIMPLEX

error: ‘CV_THRESH_BINARY_INV’ was not declared in this scope
error: ‘CV_CHAIN_APPROX_SIMPLE’ was not declared in this scope
error: ‘CV_RETR_CCOMP’ was not declared in this scope
error: ‘CV_FONT_HERSHEY_SIMPLEX’ was not declared in this scope

依次改为
cv::THRESH_BINARY_INV
cv::CHAIN_APPROX_SIMPLE
cv::RETR_CCOMP
cv::FONT_HERSHEY_SIMPLEX

CV_LOAD_IMAGE_GRAYSCALE

error: ‘CV_LOAD_IMAGE_GRAYSCALE’ was not declared in this scope

改为cv::IMREAD_COLOR

参考博客：
【Opencv】CV_* was not declared in this scope 的部分解决方法
 error: ‘CV_THRESH_BINARY_INV’ was not declared in this scope / error: ‘CV_THRESH_OTSU’ was not dec