what if object disappears?

[LoFaiTh]

What the function update returns if object disappears, say occluded for a while? Is there any way to return confidence?

[ludv1x]

I have the same question. It would be nice to have an OpenCV-compatible interface for update() function which returns a special flag if the object disappears. https://docs.opencv.org/3.4.1/d0/d0a/classcv_1_1Tracker.html#a549159bd0553e6a8de356f3866df1f18

[yyyy3531614]

Same issue here. How to decide whether it is lost when call update() with a new frame ?

[ludv1x]

I guess it make sense to use peak_value variable from here https://github.com/joaofaro/KCFcpp/blob/master/src/kcftracker.cpp#L185 as a confidence measure of the tracker. But it would be nice to have this opportunity in public API.

[StormArcher]

@ludv1x
I konw the opencv API have the flag .
such as --> retval, boundingBox = cv.Tracker.update( image )
the flag is retval

-->Problem ONR :
but the API (you said) has a big disadvantages that it cant re-init the Tracker(in other word ,we cant init a tracker 2 times ).
And I need the function (re-init ),so i must use the kcf (joaofaro/KCFcpp),this code has the function ,we can init the Tracker many times.

-->Problem TWO :
so can you give me some advice for how to use the peak_value (just like use the flag in opencv API )?

-->Problem THREE :
uoip/KCFcpp-py-wrapper
I use the python kcf wrappered from c++ kcf ( joao .f).
do you have any good ideas ?

[HaoQChen]

Did you fix that now?