catkin_make时出现‘CV_RETR_TREE’ was not declared in this scope
catkin_make时出现‘CV_RETR_TREE’ was not declared in this scope，是cv::findcontours的API更新问题，返回值数量发生了变化：
/home/ygc/catkin_ws/src/probot_grasping/src/vision_manager.cpp: In member function ‘void VisionManager::detectTable(cv::Rect&)’:
/home/ygc/catkin_ws/src/probot_grasping/src/vision_manager.cpp:96:53: error: ‘CV_RETR_TREE’ was not declared in this scopecv::findContours(binaryImage, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cv::Point(0, 0));在对应cpp里添加头文件即可：打开vision_manager.cpp，头文件里添加
#include <opencv2/imgproc/types_c.h>
即可
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