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Using cv::rgbd::Odometry::compute

Mary
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Mary Published in 2018-01-11 12:44:25Z

I am using C++ and OpenCV with combination of ROS. I use live images from my camera (intel realsense R200). I get depth and RGB images from my camera. In my c++ code I want to use these images to get odometry data and make a trajectory out of it.

I am trying to use the "cv::rgbd::Odometry::compute" function for odometry, but I always get false as return value ("isSuccess" value in the code is always 0). But I dont know which part I am doing wrong.

I read my images from camera using ROS and then in the Callback function, first I convert all images to grayscale and then I use Surf function for detecting the features. Then I want to use "compute" to get the transformation between current and previous frame.

As far as I understood "Rt" and "inintRt" are the output of function so it is enough to cunstruct them with correct size.

Can anyone see the problem? Am I missing anything?

boost::shared_ptr<rgbd::Odometry> odom;

Mat Rt = Mat(4,4, CV_64FC1);
Mat initRt = Mat(4,4, CV_64FC1);

Mat prevFtrM; //mask Matrix of previous image
Mat currFtrM; //mask Matrix of current image
Mat tempFtrM;

Mat imgprev;// previous depth image
Mat imgcurr;// current depth image

Mat imgprevC;// previous colored image
Mat imgcurrC;// current colored image


void Surf(Mat img) // detect features of the img and fill currFtrM
{
    int minHessian = 400;
    Ptr<SURF> detector = SURF::create( minHessian );
    vector<KeyPoint> keypoints_1;

    currFtrM = Mat::zeros(img.size(), CV_8U);  // type of mask is CV_8U
    Mat roi(currFtrM, cv::Rect(0,0,img.size().width,img.size().height));
    roi = Scalar(255, 255, 255);

    detector->detect( img, keypoints_1, currFtrM );

    Mat img_keypoints_1;
    drawKeypoints( img, keypoints_1, img_keypoints_1, Scalar::all(-1), DrawMatchesFlags::DEFAULT );
    //-- Show detected (drawn) keypoints
    imshow("Keypoints 1", img_keypoints_1 );
}


void Callback(const sensor_msgs::ImageConstPtr& clr, const sensor_msgs::ImageConstPtr& dpt)
{

    if(!imgcurr.data || !imgcurrC.data) // first frame
    {
        // depth image
        imgcurr = cv_bridge::toCvShare(dpt, sensor_msgs::image_encodings::TYPE_32FC1)->image;

        // colored image
        imgcurrC = cv_bridge::toCvShare(clr, "bgr8")->image;
        cvtColor(imgcurrC, imgcurrC, COLOR_BGR2GRAY);

        //find features in the image
        Surf(imgcurrC);
        prevFtrM = currFtrM;

        //scale color image to size of depth image
        resize(imgcurrC,imgcurrC, imgcurr.size());

        return;
    }

    odom = boost::make_shared<rgbd::RgbdOdometry>(imgcurrC, Odometry::DEFAULT_MIN_DEPTH(), Odometry::DEFAULT_MAX_DEPTH(),               Odometry::DEFAULT_MAX_DEPTH_DIFF(), std::vector< int >(), std::vector< float >(),               Odometry::DEFAULT_MAX_POINTS_PART(), Odometry::RIGID_BODY_MOTION);



    // depth image
    imgprev = imgcurr;
    imgcurr = cv_bridge::toCvShare(dpt, sensor_msgs::image_encodings::TYPE_32FC1)->image;

    // colored image
    imgprevC = imgcurrC;
    imgcurrC = cv_bridge::toCvShare(clr, "bgr8")->image;
    cvtColor(imgcurrC, imgcurrC, COLOR_BGR2GRAY);

    //scale color image to size of depth image
    resize(imgcurrC,imgcurrC, imgcurr.size());
    cv::imshow("Color resized", imgcurrC);

    tempFtrM = currFtrM;
    //detect new features in imgcurrC and save in a vector<Point2f>
    Surf( imgcurrC);

    prevFtrM = tempFtrM;

    //set camera matrix to identity matrix
    float vals[] = {619.137635, 0., 304.793791, 0., 625.407449, 223.984030, 0., 0., 1.};

    const Mat cameraMatrix = Mat(3, 3, CV_32FC1, vals);
    odom->setCameraMatrix(cameraMatrix);


    bool isSuccess = odom->compute( imgprevC, imgprev, prevFtrM,  imgcurrC, imgcurr, currFtrM, Rt, initRt );

    if(isSuccess)
        cout << "isSuccess   " << isSuccess << endl;

}

Update: I calibrated my camera and replaced the camera matrix with real values.

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