Visualization of Points and Trajectories

Options for the visualization of points and trajectories are included in the tracking tab.

Tip

If you want to use PeTrack visualizations in your publication export the view of PeTrack instead of taking a screenshot. This will result in a higher-quality image. See here for more info.

Options

show

Enables or disabled all of the following visualizations

Trajectory visualizations

Trajectory visualizations are visualizations that show not only information about the current point, but also about the future and past trajectory.

frames before/after actual position

These two spin-boxes allow to select how many frames into the future and past all different trajectory visualizations are supposed to be drawn.

show path

Shows the trajectory as a line. Note that during the first playback, only the past trajectory is drawn, since the future has not been tracked yet

After tracking the whole video, the trajectory will be drawn in both, past and future directions

show ground path

The head position can be projected down to the ground. This options draws the trajectory of this projection to the ground.

show points

Shows the detected points.

If the colored checkbox is checked, the color of the TrackPoint is used to fill it out

Point visualizations

Point visualizations only visualize information about the currently displayed frame.

show current point

Shows the point from the currently displayed frame. The line is colored green, if the point was created as the result of recognition or manually. It is colored blue if the point is the result of tracking only.

Checking head size will set the size of the point heuristically to the avg. head size of a person.

show height/col. color/marker ID

This option enables two different visualizations. Note that individual does not do anything for the currently recommended markers.

A colored blob, next to the person, showing which color is assigned to person.

A marker ID from an aruco marker (note that a color blob is visualized as well here)

show number

Shows the PeTrack id of a person

show ground position

Shows the projection of the head position to the ground

Show only

There are a few options which allow to select people for visualization and consequently disable visualization for all other pedestrians.

show only visible

This option disables the visualization for all people that are not visible in the current frame. This way, the past trajectories of these pedestrians is not visible and does not clutter up the image. This option does not count as selecting, i.e. show complete path and only selected do not change their behavior due to this option.

show only people

This spinbox allows to select a person by their PeTrack id. This person is then the only person visualized. If only selected (at the top of the tracking tab) is checked for tracking, only this person will get tracked as well.

Warning

If only selected is not checked, all pedestrians are tracked, even though only one is visualized!

The buttons next to the spinbox allow to jump to certain frames. begin jumps to the first frame of the trajectory, mid jumps into the middle of the trajectory and end jumps to the last frame of the trajectory.

show only people list

Visualizes multiple people. One can use a comma-separated list of id’s or a range of id’s written as e.g. 5-9. Only the selected people are visualized anymore and if only selected is checked for tracking, only the selected people are tracked.

Warning

If only selected is not checked, all pedestrians are tracked, even though only a few are visualized!

Note

All these options visualize the trajectories between the frames before/after actual position. If you want to see a larger part of the trajectories, you need to change these values, or use show complete path for selected people.

show complete path

This option changes show path to show the complete path (i.e. all past and future frames), if and only if there is an active selection (i.e. show only people or show only people list is active). If there is no active selection, this option does nothing.

Other Options

This section can be skipped for most people. Here some information on visualization options which are mostly for old markers. Mostly for completeness sake.

show color marker

Helpful option for markers that include the color as extra point, e.g. the casern marker. The circle drawn by this is colored in the color that was detected and drawn around the colored portion of the marker.

show height/col. color/marker ID

The height part of this visualization is for stereo cameras, which can measure the height of a person directly. If individual is selected, two height values are shown. The height measured in the current frame and the avg. height of the all frames. If individual is not selected, only the avg. is shown.