SIFT Opencv 代碼

#include <stdio.h>
#include <iostream>
#include <opencv2/core/core.hpp>//因爲在屬性中已經配置了opencv等目錄，所以把其當成了本地目錄一樣
#include <opencv2/features2d/features2d.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/ml/ml.hpp>
#include <opencv2/nonfree/nonfree.hpp>
#include <opencv2/legacy/legacy.hpp>
using namespace cv;
using namespace std;

int main(int argc,char* argv[])
{
    Mat img_1=imread("../1.jpg",CV_LOAD_IMAGE_GRAYSCALE);//宏定義時CV_LOAD_IMAGE_GRAYSCALE=0，也就是讀取灰度圖像
    Mat img_2=imread("../2.jpg",CV_LOAD_IMAGE_GRAYSCALE);//一定要記得這裏路徑的斜線方向，這與Matlab裏面是相反的

    if(!img_1.data || !img_2.data)//如果數據爲空
    {
        cout<<"opencv error"<<endl;
        return -1;
    }
    cout<<"open right"<<endl;

    //第一步，用SIFT算子檢測關鍵點

    SiftFeatureDetector detector;//構造函數採用內部默認的
    std::vector<KeyPoint> keypoints_1,keypoints_2;//構造2個專門由點組成的點向量用來存儲特徵點

    detector.detect(img_1,keypoints_1);//將img_1圖像中檢測到的特徵點存儲起來放在keypoints_1中
    detector.detect(img_2,keypoints_2);//同理

    //在圖像中畫出特徵點
    Mat img_keypoints_1,img_keypoints_2;

    drawKeypoints(img_1,keypoints_1,img_keypoints_1,Scalar::all(-1),DrawMatchesFlags::DEFAULT);//在內存中畫出特徵點
    drawKeypoints(img_2,keypoints_2,img_keypoints_2,Scalar::all(-1),DrawMatchesFlags::DEFAULT);

    imshow("sift_keypoints_1",img_keypoints_1);//顯示特徵點
    imshow("sift_keypoints_2",img_keypoints_2);

    //計算特徵向量
    SiftDescriptorExtractor extractor;//定義描述子對象

    Mat descriptors_1,descriptors_2;//存放特徵向量的矩陣

    extractor.compute(img_1,keypoints_1,descriptors_1);//計算特徵向量
    extractor.compute(img_2,keypoints_2,descriptors_2);

    //用burte force進行匹配特徵向量
    BruteForceMatcher<L2<float> >matcher;//定義一個burte force matcher對象
    vector<DMatch>matches;
    matcher.match(descriptors_1,descriptors_2,matches);

    //繪製匹配線段
    Mat img_matches;
    drawMatches(img_1,keypoints_1,img_2,keypoints_2,matches,img_matches);//將匹配出來的結果放入內存img_matches中

    //顯示匹配線段
    imshow("sift_Matches",img_matches);//顯示的標題爲Matches
    char key = (char)waitKey();
    if(key==27 || key =='q' || key == 'Q'){
         return 0;
    }
    return 0;
}

Linux Ubuntu 12.04
轉自: http://blog.csdn.net/lee_cv/article/details/8804578
做了一點點修改，原版的有一些問題。設置不同的seed，頭文件修改，weikey的方式