No result for tracking some first frames about multitarget-tracker

[Nuzhny007]

Hi!
I use linear regression for Kalman initialization: https://github.com/Smorodov/Multitarget-tracker/blob/master/Tracker/Kalman.cpp#L463
You can disable it: set the MIN_INIT_VALS = 0

[thuyndieu]

Thank you, I am pretty new to Kalman filter. I got to know that linear regression for Kalman filter is to generate start values for the prediction including the point(x,y) and its velocity(dx,dy). Can you please explain what you have done in the function "get_lin_regress_params"?
One more question, I have tried the versions of updating points and rectangles. Just find the point updating gives me better results than rectangles. I guess it is due to the parameters of Kalman filter, but why? thank you so much.

[Nuzhny007]

Hi!

1. "get_lin_regress_params" it's a simple linear regression for two functions:
   x(t) = kx * t + bx and y(t) = ky * t + by
   Here t is frame index, x(t) - horizontal coordinate in pixels and y(y) - vertical coordinate in pixels.
   If I detect the object on 4 frames than I can use linear regression for obtaining the equations. kx and ky - constant horizontal and vertical velocities of the object (or projection on the OX and OY axes).

2. It depends of the video. Now I want to make some changes in this code for this issue: #99
   Perhaps this will improve accuracy and clarify the operation of the filter with rectangles.

[thuyndieu]

Thank you much, I will try your change and observe the results.