How to used MSER in OpenCV2.4.2 to detect regions?

asked 2012-07-14 03:08:02 -0600

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We know that MSER(Maximally stable extremal region)was to detect affine regions between stereo images(http://en.wikipedia.org/wiki/Maximallystableextremal_regions).I just could get points(x pixel coordinate and y pixel coordinate) using MserFeatureDetector,However，I extremmely like to get region parameters besides points,such format: u(pixel coordinate x ),v(pixel coordinate y),a,b,c(a,b and c are affine region parameters),ellipse would be drawn by a,b and c.Is any friend would help me to solve the problem?

answered 2012-07-14 04:56:13 -0600

AlexanderShishkov

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You can get contours of MSER using operator().

#include <opencv2/opencv.hpp>

int main(int argc, char *argv[])
{
    Mat box = imread("box.png",1);
    MSER ms;
    vector<vector<Point>> regions;
    ms(box, regions, Mat());
    for (int i = 0; i < regions.size(); i++)
    {
        ellipse(box, fitEllipse(regions[i]), Scalar(255));
    }
    imshow("mser", box);
    waitKey(0);
    return 0;
}

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Whenever I try to run this code, I get an error message: OpenCV Error: Bad argument (Input array is not a valid matrix) in unknown function, file ......\src\opencv\modules\imgproc\src\utils.cpp, line 53 And then it stops responding! I'm using OpenCV 2.4.2, with Visual Studio 2012 RC. Any idea what's going wrong, and how I can fix it?

rdasgupta ( 2012-08-11 09:32:00 -0600 )edit

Please check that your matrix is not empty.

AlexanderShishkov ( 2012-08-29 09:32:55 -0600 )edit

If i try this, i get an error that no instance can be created of an abstract class in line "MSER ms;" in line "ms(box, regions, Mat());" i get another error stating that i make a call of a class type without a ()-operator or convertion function for type "pointer-to-function". I'm using openCV 3.0.0 and Visual Studio 2012 What can i do?

anmi ( 2015-10-14 03:38:59 -0600 )edit

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