# View the detection features on the video window

important Displaying detection features can use a lot of processor power and reduce the maximum possible sample rate if you are tracking live.

Procedure

1.In the Detection Settings screen, click the Show/Hide button on the toolbar and select Track Features.

2.Select View for the feature you want to view. Choose the color and, for the body points, whether to show the trails.

3.If you have selected to view the body points' trail, choose the number of Samples you want to be shown at a time.

4.Adjust the Line thickness and the Dot size.

5.Click Close and check the result in the Video window.

Detection features

Nose-point

To check that the nose tip is detected correctly.

Center-point

To check that the center-point of the subject is detected correctly.

The center-point is the point whose X,Y coordinates are the arithmetic mean of the X,Y coordinates of all pixels detected as subject. For more information on how the nose- and tail-base points are calculated, see Overview of nose-tail base detection.

Tail-base

To check that the base of the tail is detected correctly.

Head direction

To estimate at what the subject is sniffing. Select this option especially with Novel object and orientation tests.

Body contour

To check that the subject's contour (or the part which should be found) is detected.

Body fill

To check that the subject's body (or part of it) is detected. For example, in a test where it is important to measure the change in the animal's shape to estimate its mobility.

If you do not select a color for Body fill, the body contour will be shown as noise.

Noise

To view the pixels that match the criteria for subject detection (depending on the detection method), but other than those detected as subject.

We recommend to keep Noise selected. This way you can see which parts of the video image have gray scale values similar to those of the subject(s) to be detected.

Activity

To view the pixels that match the criteria for activity detection (see Activity settings). This setting is only available if you selected Activity analysis in the Experiment Settings.

Some of the options above are not available if your experiment is set to Only center-point detection in the Experiment Settings.

Line thickness

This refers to the thickness of the trails, the body contour and the head direction line.

Dot size

This refers to the size of the body points visualized.