C++ OpenCV:findContours函数错误

我正在使用opencv的2.4.3版本，并尝试在canny边缘检测后使用“FindContentours”功能，如下所示：

struct Component
{
    cv::Rect boundingBox;
    double area;
    double circularity;
}

cv::vector < Component > components;
cv::vector < cv::Vec4i > hierarchy;
cv::findContours ( cannyEdges, components, hierarchy, CV_RETR_CCOMP, CV_CHAIN_APPROX_NONE);

---

我怎样才能解决这个问题

cv:：findcontours将每个轮廓作为点向量返回（请参见）

您必须自己将这些向量转换为数据结构（组件），就像我创建的这个最小示例：

#include <opencv2/opencv.hpp>
#include <iostream>
struct Component
{
    cv::Rect boundingBox;
    double area;
    double circularity;
};
int main()
{
    // Create a small image with a circle in it.
    cv::Mat image(256, 256, CV_8UC3, cv::Scalar(0, 0, 0));
    cv::circle(image, cv::Point(80, 110), 42, cv::Scalar(255,127, 63), -1);

    // Find canny edges.
    cv::Mat cannyEdges;
    cv::Canny(image, cannyEdges, 80, 60);

    // Show the images.
    cv::imshow("img", image);
    cv::imshow("cannyEdges", cannyEdges);

    // Find the contours in the canny image.
    cv::vector<cv::Vec4i> hierarchy;

    // "Each contour is stored as a vector of points."
    // http://docs.opencv.org/modules/imgproc/doc/structural_analysis_and_shape_descriptors.html#findcontours
    typedef cv::vector<cv::vector<cv::Point> > TContours;
    TContours contours;
    cv::findContours(cannyEdges, contours, hierarchy, CV_RETR_CCOMP, CV_CHAIN_APPROX_NONE);
    // cannyEdges is destroyed after calling cv::findContours

    // Print number of found contours.
    std::cout << "Found " << contours.size() << " contours." << std::endl;

    // Convert contours to Components.
    typedef cv::vector<Component> TComponents;
    TComponents components;
    for (TContours::const_iterator it( contours.begin() ); it != contours.end(); ++it)
    {
        Component c;
        c.area = cv::contourArea(*it);
        c.boundingBox = cv::boundingRect(*it);
        c.circularity = 0.0; // Insert whatever you mean by circularity;
        components.push_back(c);
    }

    for (TComponents::const_iterator it( components.begin() ); it != components.end(); ++it)
        std::cout << it->area << std::endl; // and whatever you want.

    // Wait for user input.
    cv::waitKey();
}

#包括
#包括
结构组件
{
cv:：Rect边界框；
双区；
双圆度；
};
int main（）
{
//创建一个带有圆圈的小图像。
cv：：Mat图像（256，256，cv_8UC3，cv：：标量（0，0，0））；
cv：：圆（图像，cv：：点（80110），42，cv：：标量（255127，63），-1）；
//找到精明的边缘。
cv：：Mat cannyEdges；
cv：：Canny（图像，cannyEdges，80,60）；
//显示图像。
cv：：imshow（“img”，图像）；
cv：：imshow（“cannyEdges”，cannyEdges）；
//在canny图像中找到轮廓。
向量层次；
//“每个轮廓都存储为点的矢量。”
// http://docs.opencv.org/modules/imgproc/doc/structural_analysis_and_shape_descriptors.html#findcontours
typedef cv：：向量TContours；
轮廓线；
cv:：findContours（CannyEdge、等高线、层次、cv_RETR_CCOMP、cv_CHAIN_approw_NONE）；
//调用cv:：findContours后，CannyEdge将被销毁
//打印找到的轮廓数。
std：：我们不能用您显示的内容重现错误。请为该链接提供一个@karlphillip:+1亲爱的Dobi：非常感谢您的回答。我尝试了您的代码，它在“typedef cv：：vector（…）”行中给出了一个错误，说“错误：类模板的参数列表”std：：vector“丢失”。很抱歉，由于internet访问问题，我的答复迟了。我猜您使用的是旧的编译器，它不支持模板类型中的>>。我在上面的代码中更正了这一点，例如，我将“typedef cv:：vector TContours；”改为“typedef cv:：vector TContours；”。请重试。
#include <opencv2/opencv.hpp>
#include <iostream>
struct Component
{
    cv::Rect boundingBox;
    double area;
    double circularity;
};
int main()
{
    // Create a small image with a circle in it.
    cv::Mat image(256, 256, CV_8UC3, cv::Scalar(0, 0, 0));
    cv::circle(image, cv::Point(80, 110), 42, cv::Scalar(255,127, 63), -1);

    // Find canny edges.
    cv::Mat cannyEdges;
    cv::Canny(image, cannyEdges, 80, 60);

    // Show the images.
    cv::imshow("img", image);
    cv::imshow("cannyEdges", cannyEdges);

    // Find the contours in the canny image.
    cv::vector<cv::Vec4i> hierarchy;

    // "Each contour is stored as a vector of points."
    // http://docs.opencv.org/modules/imgproc/doc/structural_analysis_and_shape_descriptors.html#findcontours
    typedef cv::vector<cv::vector<cv::Point> > TContours;
    TContours contours;
    cv::findContours(cannyEdges, contours, hierarchy, CV_RETR_CCOMP, CV_CHAIN_APPROX_NONE);
    // cannyEdges is destroyed after calling cv::findContours

    // Print number of found contours.
    std::cout << "Found " << contours.size() << " contours." << std::endl;

    // Convert contours to Components.
    typedef cv::vector<Component> TComponents;
    TComponents components;
    for (TContours::const_iterator it( contours.begin() ); it != contours.end(); ++it)
    {
        Component c;
        c.area = cv::contourArea(*it);
        c.boundingBox = cv::boundingRect(*it);
        c.circularity = 0.0; // Insert whatever you mean by circularity;
        components.push_back(c);
    }

    for (TComponents::const_iterator it( components.begin() ); it != components.end(); ++it)
        std::cout << it->area << std::endl; // and whatever you want.

    // Wait for user input.
    cv::waitKey();
}