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我正在尝试检测关键点并提取一组图像的描述符并将它们存储在文本文件中以进行匹配(这将由另一段代码处理)。这是我目前所有的代码。
以下是我尝试在 Ubuntu 12.04 终端上使用 g++ sift1.cpp 编译的代码。我安装了 OpenCV 2.4.9。
#include <iostream>
#include <stdio.h>
#include <dirent.h>
#include <fstream>
#include <string>
#include <vector>
#include <iterator>
#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/nonfree/features2d.hpp>
#include <opencv2/features2d/features2d.hpp>
using namespace std;
using namespace cv;
int main(int argc, char** argv)
{
if(argc != 2)
{
cout << "Usage: ./output <database path>" << endl;
return -1;
}
Mat img;
vector<KeyPoint> keypoints;
// SiftFeatureDetector detector;
// vector<KeyPoint> keypoints;
// detector.detect(img, keypoints);
Mat descriptor;
SIFT sift;
Mat frame_gray;
// vector<Rect> faces;
ofstream outfile_kp, outfile_des;
outfile_kp.open("keypoints_file.txt");
outfile_des.open("descriptors_file.txt");
DIR *pdir = NULL;
pdir = opendir(argv[1]);
struct dirent *pent = NULL;
while(pent == readdir(pdir))
{
if((strcmp(pent -> d_name, ".") == 0) || (strcmp(pent -> d_name, "..") == 0))
{
continue;
}
img = imread(pent -> d_name, CV_LOAD_IMAGE_GRAYSCALE);
cvtColor( img, frame_gray, CV_BGR2GRAY );
equalizeHist( frame_gray, frame_gray );
sift.operator()(frame_gray,frame_gray,keypoints,descriptor,false);
// std::ostream_iterator<KeyPoint> output_iterator_kp(outfile_kp, "\n");
// std::copy(keypoints.begin(), keypoints.end(), output_iterator_kp);
// outfile_des << descriptor << endl;
// std::ostream_iterator<KeyPoint> output_iterator_des(output_des, "\n");
// std::copy(keypoints.begin(), keypoints.end(), output_iterator_des);
// outfile_kp << keypoints << endl;
// outfile_des << descriptor << endl;
}
outfile_kp.close();
outfile_des.close();
/*
Mat img_keypoints; drawkeypoints(img,keypoints,img_keypoints,Scalar::all(-1),DrawMatchesFlags::DEFAULT);
imshow("keypoints",img_keypoints);
*/
waitKey(0);
return 0;
}
以下是我得到的错误:
/tmp/ccqW6zsl.o: In function `main':
sift1.cpp:(.text+0xc1): undefined reference to `cv::SIFT::SIFT(int, int, double, double, double)'
sift1.cpp:(.text+0x20e): undefined reference to `cv::imread(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
sift1.cpp:(.text+0x26b): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'
sift1.cpp:(.text+0x283): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
sift1.cpp:(.text+0x2ab): undefined reference to `cv::cvtColor(cv::_InputArray const&, cv::_OutputArray const&, int, int)'
sift1.cpp:(.text+0x2c3): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'
sift1.cpp:(.text+0x2db): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
sift1.cpp:(.text+0x2f3): undefined reference to `cv::equalizeHist(cv::_InputArray const&, cv::_OutputArray const&)'
sift1.cpp:(.text+0x30b): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'
sift1.cpp:(.text+0x323): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
sift1.cpp:(.text+0x33b): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
sift1.cpp:(.text+0x379): undefined reference to `cv::SIFT::operator()(cv::_InputArray const&, cv::_InputArray const&, std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&, cv::_OutputArray const&, bool) const'
sift1.cpp:(.text+0x3c3): undefined reference to `cv::waitKey(int)'
/tmp/ccqW6zsl.o: In function `cv::Mat::~Mat()':
sift1.cpp:(.text._ZN2cv3MatD2Ev[_ZN2cv3MatD5Ev]+0x2b): undefined reference to `cv::fastFree(void*)'
/tmp/ccqW6zsl.o: In function `cv::Mat::operator=(cv::Mat const&)':
sift1.cpp:(.text._ZN2cv3MataSERKS0_[cv::Mat::operator=(cv::Mat const&)]+0xf2): undefined reference to `cv::Mat::copySize(cv::Mat const&)'
/tmp/ccqW6zsl.o: In function `cv::Mat::release()':
sift1.cpp:(.text._ZN2cv3Mat7releaseEv[cv::Mat::release()]+0x3b): undefined reference to `cv::Mat::deallocate()'
/tmp/ccqW6zsl.o: In function `cv::Feature2D::~Feature2D()':
sift1.cpp:(.text._ZN2cv9Feature2DD2Ev[cv::Feature2D::~Feature2D()]+0x46): undefined reference to `cv::DescriptorExtractor::~DescriptorExtractor()'
sift1.cpp:(.text._ZN2cv9Feature2DD2Ev[cv::Feature2D::~Feature2D()]+0x5b): undefined reference to `cv::FeatureDetector::~FeatureDetector()'
sift1.cpp:(.text._ZN2cv9Feature2DD2Ev[cv::Feature2D::~Feature2D()]+0x72): undefined reference to `cv::Algorithm::~Algorithm()'
sift1.cpp:(.text._ZN2cv9Feature2DD2Ev[cv::Feature2D::~Feature2D()]+0xa2): undefined reference to `cv::FeatureDetector::~FeatureDetector()'
sift1.cpp:(.text._ZN2cv9Feature2DD2Ev[cv::Feature2D::~Feature2D()]+0xbd): undefined reference to `cv::Algorithm::~Algorithm()'
/tmp/ccqW6zsl.o: In function `cv::SIFT::~SIFT()':
sift1.cpp:(.text._ZN2cv4SIFTD1Ev[cv::SIFT::~SIFT()]+0x1e): undefined reference to `vtable for cv::SIFT'
sift1.cpp:(.text._ZN2cv4SIFTD1Ev[cv::SIFT::~SIFT()]+0x30): undefined reference to `vtable for cv::SIFT'
sift1.cpp:(.text._ZN2cv4SIFTD1Ev[cv::SIFT::~SIFT()]+0x37): undefined reference to `vtable for cv::SIFT'
sift1.cpp:(.text._ZN2cv4SIFTD1Ev[cv::SIFT::~SIFT()]+0x42): undefined reference to `VTT for cv::SIFT'
sift1.cpp:(.text._ZN2cv4SIFTD1Ev[cv::SIFT::~SIFT()]+0x6b): undefined reference to `cv::Algorithm::~Algorithm()'
sift1.cpp:(.text._ZN2cv4SIFTD1Ev[cv::SIFT::~SIFT()]+0x9d): undefined reference to `cv::Algorithm::~Algorithm()'
collect2: ld returned 1 exit status
我无法解决这些问题。任何见解将不胜感激。提前致谢。