# Detect the nose and the tail base

Learn about

▪Overview of nose-tail base detection

▪Optimize nose-tail base detection

When do I need this information?

In the Experiment Settings, under Tracked features, you chose Center-point, nose-point and tail-base detection. Choose the procedure based on what you selected under Body point detection technique. See Body point detection technique

Contour-based technique

Follow the procedure in this order:

1. Adjust the settings for nose-tail base detection (Contour-based)

2.Adjust Advanced detection settings: Smoothing

3.Adjust Subject contour for nose-tail base detection

4.Adjust Subject size for nose-tail base detection

Deep learning

Follow the procedure: Adjust the settings for nose-tail base detection (Deep learning)

note Subject size and contour do not affect the performance of the Deep learning algorithm. Therefore, EthoVision XT should be able to find the nose and tail base points also when the detection of the subject’s body is not optimal. However, we advise you to adjust the settings for size and contour, especially if you want to analyze the body’s mobility.