opencv：对`cv :: cuda :: DescriptorMatcher :: createBFMatcher（int）'的未定义引用

Question

我正在尝试通过以下方式编译opencv-3.1.0/samples/gpu/surf_keypoint_matcher.cpp：

g++ -I/usr/local/include/opencv -I/usr/local/include/opencv2 -L/usr/local/lib/ -g -o binary surf_keypoint_matcher.cpp -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_stitching -lopencv_imgcodecs -lopencv_xfeatures2d

但是我收到了这个错误：

/tmp/ccQW7t3Z.o: In function `main':
/home/luca/Downloads/opencv-3.1.0/samples/gpu/surf_keypoint_matcher.cpp:65: undefined reference to `cv::cuda::DescriptorMatcher::createBFMatcher(int)'
collect2: error: ld returned 1 exit status

为什么？

Answer 1

您的错误消息：

/home/luca/Downloads/opencv-3.1.0/samples/gpu/surf_keypoint_matcher.cpp:65: undefined reference to `cv::cuda::DescriptorMatcher::createBFMatcher(int)'
collect2: error: ld returned 1 exit status

表示您对cv::cuda::DescriptorMatcher::createBFMatcher

有未定义的引用

这位于cuda libs中，因此您需要包含相应的标题并链接到以下库中，因为opencv_cudafeatures2d取决于它们：

• opencv_cudafilters
• opencv_cudawarping
• opencv_features2d
• opencv_cudaarithmn
• opencv_flann
• opencv_core

对于我正在使用的opencv 3.1.0版本来说确实如此

Answer 2

DescriptorMatcher is in cudafeatures2d.hpp。因此，您必须在.cpp程序和link the library in the compile process中添加标头cudafeatures2d.hpp。

如果您使用此-lopencv_cudafeatures2d：

，程序将会运行

g++ -I/usr/local/include/opencv -I/usr/local/include/opencv2 -L/usr/local/lib/ -g -o binary surf_gpu_probe1.cpp -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_stitching -lopencv_imgcodecs -lopencv_xfeatures2d -lopencv_cudafeatures2d