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create returns a cv::Ptr. It is a static function and usually for clarity and sanity one calls these not from an object, but from the class. In your case stereo is a nullptr and so you are getting a segfault.

The following is correct:

auto sgbm = cv::stereo::StereoBinarySGBM::create( 0, //mindisp NDISP_DEFAULT, //numdisp 9, //BlockSize 25, //P1 50, //P2 1, //dispdiffmax 63, //prefiltercap 40, //uniqueness 200, //speckle window size 2, //speckle range cv::StereoSGBM::MODE_SGBM ) );

Mat imgL = imread("L.png", CV_LOAD_IMAGE_GRAYSCALE); Mat imgR = imread("R.png", CV_LOAD_IMAGE_GRAYSCALE); Mat disp;

sgbm->compute(imgL, imgR, disp);

create returns a cv::Ptr. It is a static function and usually for clarity and sanity one calls these not from an object, but from the class. In your case stereo is a nullptr and so you are getting a segfault.

The following is correct:

auto sgbm = cv::stereo::StereoBinarySGBM::create( 0, //mindisp
NDISP_DEFAULT, //numdisp
9, //BlockSize
25, //P1
50, //P2
1, //dispdiffmax
63, //prefiltercap
40, //uniqueness
200, //speckle window size
2, //speckle range
cv::StereoSGBM::MODE_SGBM ) );
);
  
Mat imgL = imread("L.png", CV_LOAD_IMAGE_GRAYSCALE);
Mat imgR = imread("R.png", CV_LOAD_IMAGE_GRAYSCALE);
Mat disp;disp;
  
sgbm->compute(imgL, imgR, disp);disp);

create cv::stereo::StereoBinarySGBM::create returns a cv::Ptr. cv::Ptr. It is a static function and usually for clarity and sanity one calls these not from an object, but from with the class. In your case stereo is a nullptr and so you are getting a segfault.

The following is correct:

auto sgbm = cv::stereo::StereoBinarySGBM::create(    0,   //mindisp
                                                      NDISP_DEFAULT, //numdisp
                                                      9,   //BlockSize
                                                     25,   //P1
                                                     50,   //P2
                                                      1,   //dispdiffmax
                                                     63,   //prefiltercap
                                                     40,   //uniqueness
                                                    200,   //speckle window size
                                                      2,   //speckle range
                                                      cv::StereoSGBM::MODE_SGBM ) );

Mat cv::Mat imgL = imread("L.png", cv::imread("L.png", CV_LOAD_IMAGE_GRAYSCALE);
Mat cv::Mat imgR = imread("R.png", cv::imread("R.png", CV_LOAD_IMAGE_GRAYSCALE);
Mat cv::Mat disp;

sgbm->compute(imgL, imgR, disp);