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  • 图像的矩

    1 矩的计算:moments()函数
    Moments moments(InputArray array,bool binaryImage=false)

    2 就是轮廓面积:contourArea()函数
    double contourArea(InputArray contour,bool oriented=false)

    3 计算轮廓长度:arcLength()函数
    double arcLength(InputArray curve,bool closed)

    //例子

    include "opencv2/highgui/highgui.hpp"

    include "opencv2/imgproc/imgproc.hpp"

    include

    using namespace cv;
    using namespace std;

    //-----------------------------------【宏定义部分】--------------------------------------------
    // 描述:定义一些辅助宏
    //------------------------------------------------------------------------------------------------

    define WINDOW_NAME1 "【原始图】" //为窗口标题定义的宏

    define WINDOW_NAME2 "【图像轮廓】" //为窗口标题定义的宏

    //-----------------------------------【全局变量声明部分】--------------------------------------
    // 描述:全局变量的声明
    //-----------------------------------------------------------------------------------------------
    Mat g_srcImage; Mat g_grayImage;
    int g_nThresh = 100;
    int g_nMaxThresh = 255;
    RNG g_rng(12345);
    Mat g_cannyMat_output;
    vector<vector > g_vContours;
    vector g_vHierarchy;

    //-----------------------------------【全局变量声明部分】--------------------------------------
    // 描述:全局变量的声明
    //-----------------------------------------------------------------------------------------------
    void on_ThreshChange(int, void* );
    static void ShowHelpText( );

    //-----------------------------------【main( )函数】--------------------------------------------
    // 描述:控制台应用程序的入口函数,我们的程序从这里开始执行
    //-----------------------------------------------------------------------------------------------
    int main( int argc, char** argv )
    {
    //【0】改变console字体颜色
    system("color 9F");

    ShowHelpText();
    // 读入原图像, 返回3通道图像数据
    g_srcImage = imread( "1.jpg", 1 );
    
    // 把原图像转化成灰度图像并进行平滑
    cvtColor( g_srcImage, g_grayImage, COLOR_BGR2GRAY );
    blur( g_grayImage, g_grayImage, Size(3,3) );
    
    // 创建新窗口
    namedWindow( WINDOW_NAME1, WINDOW_AUTOSIZE );
    imshow( WINDOW_NAME1, g_srcImage );
    
    //创建滚动条并进行初始化
    createTrackbar( " 阈值", WINDOW_NAME1, &g_nThresh, g_nMaxThresh, on_ThreshChange );
    on_ThreshChange( 0, 0 );
    
    waitKey(0);
    return(0);
    

    }

    //-----------------------------------【on_ThreshChange( )函数】-------------------------------
    // 描述:回调函数
    //-----------------------------------------------------------------------------------------------
    void on_ThreshChange(int, void* )
    {
    // 使用Canndy检测边缘
    Canny( g_grayImage, g_cannyMat_output, g_nThresh, g_nThresh*2, 3 );

    // 找到轮廓
    findContours( g_cannyMat_output, g_vContours, g_vHierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point(0, 0) );
    
    // 计算矩
    vector<Moments> mu(g_vContours.size() );
    for(unsigned int i = 0; i < g_vContours.size(); i++ )
    { mu[i] = moments( g_vContours[i], false ); }
    
    //  计算中心矩
    vector<Point2f> mc( g_vContours.size() );
    for( unsigned int i = 0; i < g_vContours.size(); i++ )
    { mc[i] = Point2f( static_cast<float>(mu[i].m10/mu[i].m00), static_cast<float>(mu[i].m01/mu[i].m00 )); }
    
    // 绘制轮廓
    Mat drawing = Mat::zeros( g_cannyMat_output.size(), CV_8UC3 );
    for( unsigned int i = 0; i< g_vContours.size(); i++ )
    {
    	Scalar color = Scalar( g_rng.uniform(0, 255), g_rng.uniform(0,255), g_rng.uniform(0,255) );//随机生成颜色值
    	drawContours( drawing, g_vContours, i, color, 2, 8, g_vHierarchy, 0, Point() );//绘制外层和内层轮廓
    	circle( drawing, mc[i], 4, color, -1, 8, 0 );;//绘制圆
    }
    
    // 显示到窗口中
    namedWindow( WINDOW_NAME2, WINDOW_AUTOSIZE );
    imshow( WINDOW_NAME2, drawing );
    
    // 通过m00计算轮廓面积并且和OpenCV函数比较
    printf("	 输出内容: 面积和轮廓长度
    ");
    for(unsigned  int i = 0; i< g_vContours.size(); i++ )
    {
    	printf(" >通过m00计算出轮廓[%d]的面积: (M_00) = %.2f 
     OpenCV函数计算出的面积=%.2f , 长度: %.2f 
    
    ", i, mu[i].m00, contourArea(g_vContours[i]), arcLength( g_vContours[i], true ) );
    	Scalar color = Scalar( g_rng.uniform(0, 255), g_rng.uniform(0,255), g_rng.uniform(0,255) );
    	drawContours( drawing, g_vContours, i, color, 2, 8, g_vHierarchy, 0, Point() );
    	circle( drawing, mc[i], 4, color, -1, 8, 0 );
    }
    

    }

    //-----------------------------------【ShowHelpText( )函数】-----------------------------
    // 描述:输出一些帮助信息
    //----------------------------------------------------------------------------------------------
    void ShowHelpText()
    {
    //输出欢迎信息和OpenCV版本
    printf(" 非常感谢购买《OpenCV3编程入门》一书! ");
    printf(" 此为本书OpenCV3版的第76个配套示例程序 ");
    printf(" 当前使用的OpenCV版本为:" CV_VERSION );
    printf(" ---------------------------------------------------------------------------- ");
    }

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  • 原文地址:https://www.cnblogs.com/shuguomeifuguo/p/12005177.html
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