【opencv学习记录】以迭代器方式访问图像像素，统计像素信息存入

opencv2.4.9，练习使用图像迭代器访问像素值+STL中的vector#include <opencv2\core\core.hpp>#include <opencv2\highgui\highgui.hpp>#include <opencv2\imgproc\imgproc.hpp>#include <iostream>#include <fstream>using namespace std;using namespace cv;int ppmain(){fstream fs;Mat A = imread("lena.jpg",1);cout<<A.channels()<<endl;cv::cvtColor(A,A,COLOR_BGR2GRAY);cout<<A.channels()<<endl;cv::threshold(A,A,50,255,THRESH_BINARY);cout<<A.channels()<<endl;imshow("Binary",A);//resize(A,A,Size(16,32));Mat B = A(Rect(50,50,10,10));imshow("B",B);float BL,counter = 0;int Sqaure = B.cols * B.rows;Mat_<uchar>::iterator it = B.begin<uchar>();Mat_<uchar>::iterator itend = B.end<uchar>();vector<float> xs;for (; it!=itend; ++it){xs.push_back(*it);if((*it)>0)counter+=1;}BL = counter/Sqaure;cout<<xs.size()<<endl;cout<<counter<<endl;for(int m = 0 ;m<xs.size();m++)cout<<xs[m]<<" ";//写入文件ofstream out("out.txt",ios::out);int len = xs.size();for(int i=0;i<len;++i){out<<xs[i]<<endl;}out.close();/*for(int i = 0;i<A.rows;i++){for(int j= 0;j<A.cols;j++){int xiangsu = A.at<uchar>(j,i);}}*/cv::waitKey();return 0;}

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