c++ - FindCirclesGrid c++11 不起作用，尽管检测器找到了所有点

Question

中的网格



未找到，尽管 simpleBlobDetector检测每个 blob。

我使用以下代码，图像作为输入图像:

    vector<Point2f> pointBuf;
    Size gridSize(4, 11);

    cv::SimpleBlobDetector::Params params;
    params.maxArea = (image.rows * image.cols) / (gridSize.height * gridSize.width * 1.5);
    params.minArea = 70;
    params.minConvexity = 0.85;
    params.minThreshold = 80;
    params.maxThreshold = 230;
    params.thresholdStep = 20;
    params.minInertiaRatio = 0.05;

    auto detector = cv::SimpleBlobDetector::create(params);
    vector<KeyPoint> keypoints;
    detector->detect(image, keypoints);

    Mat debugImage = Mat::zeros(image.size(), CV_8U);
    for (auto keypoint : keypoints) {
        drawKeypoints(debugImage, keypoints, debugImage, 255);
    }
    imwrite("./debug/" + "debugImage.png", image);
    imwrite("./debug/" + "debugImage2.png", debugImage);

    findCirclesGrid(image, gridSize, pointBuf, cv::CALIB_CB_ASYMMETRIC_GRID, detector);

该代码适用于其他图像。那么为什么代码在这个图像上不起作用呢？

Answer 1

您的代码没有问题并且工作正常。您分享的关于过滤器参数的图像的唯一问题params.maxArea此限制不会让程序检测到您的网格。这是我尝试的代码和结果:

#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/features2d.hpp>
#include <vector>
#include "opencv2/opencv.hpp"

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{

        Mat image = imread("/your/image/directory/blob.jpg");

        vector<Point2f> pointBuf;
        Size gridSize(4, 11);

        cv::SimpleBlobDetector::Params params;
        params.maxArea = 10000;
        params.minArea = 70;
        params.minConvexity = 0.85;
        params.minThreshold = 80;
        params.maxThreshold = 230;
        params.thresholdStep = 20;
        params.minInertiaRatio = 0.05;

        auto detector = cv::SimpleBlobDetector::create(params);
        vector<KeyPoint> keypoints;
        detector->detect(image, keypoints);

        Mat debugImage = Mat::zeros(image.size(), CV_8U);
        for (auto keypoint : keypoints) {
            drawKeypoints(debugImage, keypoints, debugImage, 255);
        }

        findCirclesGrid(image, gridSize, pointBuf, cv::CALIB_CB_ASYMMETRIC_GRID, detector);

        imshow("Result",debugImage);
        imshow("Before",image);

        waitKey(0);
        return 0;

}

结果:



注:您可以查看 this documentation了解有关参数的更多信息。