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//
//  ExtractSIFT.cpp
//  invertedIndex
//
//  Created by xuhuaiyu on 14-12-4.
//  Copyright （c） 2014年 xuhuaiyu. All rights reserved.
//

#include “opencv2/highgui/highgui.hpp“
#include “opencv2/calib3d/calib3d.hpp“
#include “opencv2/imgproc/imgproc.hpp“
#include “opencv2/features2d/features2d.hpp“
#include “opencv2/nonfree/nonfree.hpp“

#include 

using namespace cv;
using namespace std;

//此处定义了K-means聚类的中心数注意定义的聚类中心数肯定是不能大于特征点的个数了
//本程序只针对img1进行了聚类，所以宏定义的种类数较少


void extractSIFTDescriptor（string）;//提取SIFT特征
Mat k_means（Mat&  int ）;//k-means聚类
/**
 1.提取SIFT特征点
 2.获得所有图片的SIFT特征点的特征描述符矩阵（此处还需要写一个管理图片训练集的类）
 3.利用特征描述符矩阵进行K-means聚类，获得视觉单词表
 */

/**
 提取SIFT特征：
 
 dir:图片训练集的目录
 */
void extractSIFTDescriptor（string dir）{
    cv::initModule_nonfree（）;//使用SIFT/SURF create之前，必须先initModule_（）;
    
    Ptr detector = FeatureDetector::create（ “SIFT“ ）;
    
    PtrriptorExtractor> descriptorExtractor = DescriptorExtractor::create（ “SIFT“ ）;
    if（ detector.empty（） || descriptorExtractor.empty（） ）
    {
        cout << “Can not create detector or descriptor extractor of given types“ << endl;
        return ;
    }
    
    Mat allDescriptors ;//将所有图片的特征描述符存储在一起
    
    
    //------------------------------------------------------------------------------------------
    //下面需要写一个管理图片训练集的类
    /**
     遍历训练图片集文件夹，提取每张图片的SIFT特征点及特征点的特征描述符并合并在一起
     */
    Mat img;
    vector keypoints;
    detector->detect（ img keypoints ）;//特征点
    
    Mat descriptors;//特征点的特征描述符
    descriptorExtractor->compute（ img keypoints descriptors ）;
    
    allDescriptors.push_back（descriptors）;//将该图像所有特征点的特征描述符附加到总特征描述符矩阵的末尾
    
    //------------------------------------------------------------------------------------------
    
    
    
    
   //此时已经得到了allDescriptor，及所有特征点的特征描述符下面该进行聚类和统计词频的操作
    int clusterNumber = 10;//k_means聚类中心数
    Mat center = k_means（allDescriptors clusterNumber）;//center矩阵存储视觉单词表
   
    
}
/**
 k-means聚类:
 
 allDescriptors:所有图片的特征点的特征描述符矩阵
 clusterNum:类别数
 
 return:聚类后的视觉单词表
 */
Mat k_means（Mat& allDescriptors int clusterNum）{
    
    BOWKMeansTrainer bowK（clusterNum
                          cvTermCriteria （CV_TERMCRIT_EPS + CV_TERMCRIT_ITER 10 0.1）32）;
    return bowK.cluster（allDescriptors）;
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2015-01-26 06:51  Logo_recognition-master\
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\
     文件       41909  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\project.pbxproj
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\project.xcworkspace\
     文件         158  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\project.xcworkspace\contents.xcworkspacedata
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\project.xcworkspace\xcuserdata\
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\project.xcworkspace\xcuserdata\xuhuaiyu.xcuserdatad\
     文件       37412  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\project.xcworkspace\xcuserdata\xuhuaiyu.xcuserdatad\UserInterfaceState.xcuserstate
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\xcuserdata\
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\xcuserdata\xuhuaiyu.xcuserdatad\
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\xcuserdata\xuhuaiyu.xcuserdatad\xcdebugger\
     文件          91  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\xcuserdata\xuhuaiyu.xcuserdatad\xcdebugger\Breakpoints_v2.xcbkptlist
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\xcuserdata\xuhuaiyu.xcuserdatad\xcschemes\
     文件        3191  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\xcuserdata\xuhuaiyu.xcuserdatad\xcschemes\invertedIndex.xcscheme
     文件         485  2015-01-26 06:51  Logo_recognition-master\invertedIndex.xcodeproj\xcuserdata\xuhuaiyu.xcuserdatad\xcschemes\xcschememanagement.plist
     目录           0  2015-01-26 06:51  Logo_recognition-master\invertedIndex\
     文件        2982  2015-01-26 06:51  Logo_recognition-master\invertedIndex\ExtractSIFT.cpp
     文件        1434  2015-01-26 06:51  Logo_recognition-master\invertedIndex\ImgSet.cpp
     文件         789  2015-01-26 06:51  Logo_recognition-master\invertedIndex\ImgSet.h
     文件         172  2015-01-26 06:51  Logo_recognition-master\invertedIndex\SIFTDescriptor.cpp
     文件        1517  2015-01-26 06:51  Logo_recognition-master\invertedIndex\SIFTDescriptor.h
     文件       29165  2015-01-26 06:51  Logo_recognition-master\invertedIndex\main.cpp