编译出错detector = cv::FeatureDetector::create("ORB");

执行语句

detector = cv::FeatureDetector::create("ORB");

出现错误如下：

error: ‘create’ is not a member of ‘cv::FeatureDetector {aka cv::Feature2D}’

opencv版本问题，3.X以上语法更改，解决方法有两种，
方法一： 降OpenCV版本，cmakelist中opencv版本指定：

find_package(OpenCV 2.4 REQUIRED)

重新编译

cd build
cmake ..
make

方法二：改写

cv::Ptr<cv::FeatureDetector> detector = cv::ORB::create();
cv::Ptr<cv::DescriptorExtractor> descriptor = cv::ORB::create();