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opencv中ptr的使用

时间:2015-06-17 10:51:38      阅读:239      评论:0      收藏:0      [点我收藏+]

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#include <QCoreApplication> #include<stdio.h> #include<opencv2/highgui/highgui.hpp> #include<opencv2/core/core.hpp> using namespace cv; void colorReduce(Mat &image,int div =64){ int nl = image.rows; int nc =image.cols*image.channels(); for(int j =0;j<nl;j++ ) { uchar* data = image.ptr<uchar>(j);//最需要注意的就是这行代码的使用 for(int i=0;i<nc;i++) {
qDebug("the first data[i] is %d",data[i]); data[i]
= data[i]/div*div ;
/**************************

另外此处还可以如此 使用uchar *data = image.ptr<uchar>(j)[i];
这种方式更加经典,执行效率更高

********************************/
qDebug("the second data[i] is %d",data[i]);
// data[i] = data[i]/(div*div)+ div/2;

// data[i] = data[i]%div+ div/2;
         //   data[i] = data[i] + div/2;
        }
    }


}
int main()
{
    Mat image1;
    image1 = imread("/home/bi/pic/mei.jpg");
    namedWindow("image1");
    imshow("image1",image1);
   namedWindow("colorReduce");
   colorReduce(image1);
    //QCoreApplication a(argc, argv);
   imshow("colorReduce",image1);
   waitKey();
   return 0;
    //return a.exec();
}
 1 template<typename _Tp> class Ptr
 2 {
 3 public:
 4 // default constructor
 5 Ptr();
 6 // constructor that wraps the object pointer
 7 Ptr(_Tp* _obj);
 8 // destructor: calls release()
 9 ~Ptr();
10 // copy constructor; increments ptr’s reference counter
11 Ptr(const Ptr& ptr);
12 // assignment operator; decrements own reference counter
13 // (with release()) and increments ptr’s reference counter
14 Ptr& operator = (const Ptr& ptr);
15 // increments reference counter                                             
16 void addref();                                                                                                                     
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opencv中ptr的使用

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原文地址:http://www.cnblogs.com/haoxing990/p/4582437.html

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