Tracker Re-track

kohila · April 8, 2021, 10:11am

Dear All,

I am working in a tracking module. i am using CSRT tracker to track the object. its tracking well. But once the object is missing its not coming to else part. Always returns true. Is it possible to re-track once the object appears. Please do the helpful.

Thanks and Regards,
Kohila.S

berak · April 8, 2021, 10:48am

since this is the only condition, that will make update() fail:

github.com

opencv/opencv_contrib/blob/da6a95e0dbb4df268db451e0751fb5d2dd986e8f/modules/tracking/src/trackerCSRT.cpp#L419


}

Point2f TrackerCSRTImpl::estimate_new_position(const Mat &image)
{

    Mat resp = calculate_response(image, csr_filter);

    double max_val;
    Point max_loc;
    minMaxLoc(resp, NULL, &max_val, NULL, &max_loc);
    if (max_val < params.psr_threshold)
        return Point2f(-1,-1); // target "lost"

    // take into account also subpixel accuracy
    float col = ((float) max_loc.x) + subpixel_peak(resp, "horizontal", max_loc);
    float row = ((float) max_loc.y) + subpixel_peak(resp, "vertical", max_loc);
    if(row + 1 > (float)resp.rows / 2.0f) {
        row = row - resp.rows;
    }
    if(col + 1 > (float)resp.cols / 2.0f) {
        col = col - resp.cols;

you could try to lower the resp. threshold value

ieliz · April 8, 2021, 10:51am

Hi! As I understand, the task you describing here is long-term visual object tracking.
You need to use the tracker which is able to do it.
As I remember, in OpenCV it can be MOSSE, KCF, GOTURN trackers (please remember, that some of them are moved to “legacy”).
Also, in OpenCV, you can use DaSiamRPN and SiamRPN++ trackers (Python 3 versions).
But I would recommend reading about long-term visual object tracking more precisely

kohila · April 8, 2021, 11:10am

ok. Thank you. Let me check.

kohila · April 8, 2021, 11:12am

OK . let me try and update.Thanks for the info.