# Visualization¶

The visualization tab provides a series of options for visualizing the object tracks. The color of each track can be based on:

1. Constant - Constant color for all tracks, selected with the Constant color button.
2. Track - A random color from the Color Map is chosen for each track.
3. Velocity - A color based on the x velocity, y velocity, or magnitude of the velocity, the selected Color Map, and the selected Range.

The number of points of each track can be changed with the Point history spinner. To show every point of every track, no matter what frame is currently displayed, un-check the Only show tracks with point in frame check box.

The points of the track can be displayed by selecting the Show points check-box. The size of the point can be changed using the Point radius spinner. The edge of the points can be changed using the Edge width spinner where a value of -1 will remove the edge. The points can be filled by selecting the Fill check-box. Finally, the points can fade out as the point gets further away from the current frame by selecting the Fade out check-box.

Lines can be drawn through points by selecting the Show Lines check-box. The width of the lines can be changed using the Line width spinner.

To see the search areas (radius) of the poly-projection algorithm, select the Show search check-box. The width of the line and the style of the line ( solid, dash, or dot) can be changed using the Edge width spinner and Edge style drop-down list.

When using multi-threading or multi-processing with more than 1 worker, the domain decomposition can be displayed by selecting the Show domain decomposition check-box. The color and transparency of the tile edges can be changed by using the Color button and the Transparency spinner.

Finally, images of the currently displayed frame can be saved by selecting the Save image stack check-box. As the frames are traversed, by either pressing play or the forward and backward buttons, the frames will automatically be saved in the directory specified in the Path line-edit. The Browse button can be used to browse to a directory. The name of the saved images can be changed using the Prefix line-edit. A zero-padded integer corresponding to the frame will be automatically added after the prefix. The saved images can be scaled using the Scale spinner, which is a multiplier on the number of pixels. See ffmpeg Commands for turning the image stack into a video using FFMPEG.