Videos can suffer from multiple issues that can make tracking difficult or even prevent it altogether. Two of the most common issues are camera movement and light/color variations. Camera movement is often caused by improper camera support (e.g. ball head too weak for the weight of the camera) or by vibrations or shocks received by the apparatus during the recording (e.g. if the apparatus is accidentally knocked off position by the experimenter). Light and color variations are frequent when recording outdoors or when the apparatus is not properly isolated from external light sources (e.g. when someone opens up a door or turn on and off the lights during an experiment).
trackR provides a convenient utility to attempt to fix these common issues:
videoFixer(). You can launch
videoFixer by typing the following command in your R console:
Note that using
videoFixer is completely optional. If your videos have none of the aforementioned issues, you can skip this step and move directly to the rest of the tutorials.