Dear developers and professors, There are some questions for pedestrian trajectory. 1. Our vedios were not taken high up the staircases, but the camera was set beside, picture is shown in the document.I want to know how the "Perspective filter" function works(the principle). Where does the output XY comes from? 2、How to make a connection between the reality XY and the pixel XY with lower error? By calibration points or sticks? But when I try to take a calibration, for example, the staircase width is fixed,but when I set two calibration sticks on two steps of the staircase, the sticks can't fit the width, maybe one of them is more shorter. 3. If the Tracker can use for pedestrian trajectory research?
Hi I guess from the picture the trajectory is not parallel to the camera projection plane. The pedestrian descending the stairs will be moving far away from the camera so, each new tracked pixel in the picture will represent more distance in the 3d space. You must compensate with trigonometry for this even after using the perspective filter. Or you will get a deceleration in your speed estimation calculus when the pedestrian moving at a constant speed.
