error LNK2019: 无法解析的外部符号 六处错误的纠正

错误    18    error LNK2019: 无法解析的外部符号 "public: void __thiscall cv::FeatureDetector::detect(class cv::Mat const &,class std::vector > &,class cv::Mat const &)const " (?detect@FeatureDetector@cv@@QBEXABVMat@2@AAV?$vector@VKeyPoint@cv@@V?$allocator@VKeyPoint@cv@@@std@@@std@@0@Z)，该符号在函数 "int * __cdecl ImageFeatureExtract(unsigned char *,int,int,int,int)" (?ImageFeatureExtract@@YAPAHPAEHHHH@Z) 中被引用    E:\IndoorLocate\code\SIFT_LLC(8.3)\SIFT_LLC(8.3)\FeatureExtract.obj    SIFT_LLC(8.3)

错误    20    error LNK2019: 无法解析的外部符号 "public: void __thiscall cv::DescriptorExtractor::compute(class cv::Mat const &,class std::vector > &,class cv::Mat &)const " (?compute@DescriptorExtractor@cv@@QBEXABVMat@2@AAV?$vector@VKeyPoint@cv@@V?$allocator@VKeyPoint@cv@@@std@@@std@@AAV32@@Z)，该符号在函数 "int * __cdecl ImageFeatureExtract(unsigned char *,int,int,int,int)" (?ImageFeatureExtract@@YAPAHPAEHHHH@Z) 中被引用    E:\IndoorLocate\code\SIFT_LLC(8.3)\SIFT_LLC(8.3)\FeatureExtract.obj    SIFT_LLC(8.3)

错误    19    error LNK2019: 无法解析的外部符号 "public: static class cv::Ptr __cdecl cv::FeatureDetector::create(class std::basic_string,class std::allocator > const &)" (?create@FeatureDetector@cv@@SA?AV?$Ptr@VFeatureDetector@cv@@@2@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)，该符号在函数 "int * __cdecl ImageFeatureExtract(unsigned char *,int,int,int,int)" (?ImageFeatureExtract@@YAPAHPAEHHHH@Z) 中被引用    E:\IndoorLocate\code\SIFT_LLC(8.3)\SIFT_LLC(8.3)\FeatureExtract.obj    SIFT_LLC(8.3)

错误    21    error LNK2019: 无法解析的外部符号 "public: static class cv::Ptr __cdecl cv::DescriptorExtractor::create(class std::basic_string,class std::allocator > const &)" (?create@DescriptorExtractor@cv@@SA?AV?$Ptr@VDescriptorExtractor@cv@@@2@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)，该符号在函数 "int * __cdecl ImageFeatureExtract(unsigned char *,int,int,int,int)" (?ImageFeatureExtract@@YAPAHPAEHHHH@Z) 中被引用    E:\IndoorLocate\code\SIFT_LLC(8.3)\SIFT_LLC(8.3)\FeatureExtract.obj    SIFT_LLC(8.3)

错误    22    error LNK2019: 无法解析的外部符号 "bool __cdecl cv::initModule_nonfree(void)" (?initModule_nonfree@cv@@YA_NXZ)，该符号在函数 "int * __cdecl ImageFeatureExtract(unsigned char *,int,int,int,int)" (?ImageFeatureExtract@@YAPAHPAEHHHH@Z) 中被引用    E:\IndoorLocate\code\SIFT_LLC(8.3)\SIFT_LLC(8.3)\FeatureExtract.obj    SIFT_LLC(8.3)

错误    23    error LNK1120: 5 个无法解析的外部命令    E:\IndoorLocate\code\SIFT_LLC(8.3)\Debug\SIFT_LLC(8.3).exe    1    1    SIFT_LLC(8.3)

纠正方法：

       缺少了库函数。在连接器--输入--附加依赖项里面加上两个库：opencv_nonfree249d.lib    opencv_features2d249d.lib
                                                                                                                    249处是自己的OpenCV对用版本