Knowledge Base

Custom Expression Inputs In Detail

You can choose one or more of the following building blocks:

Facial Expressions

The default facial expressions (Neutral, Happy, Sad, Angry, Surprised, Scared, Disgusted and Contempt).

Please note that the default expressions are available as building blocks with Baby FaceReader but they do not generate an output as Baby FaceReader cannot detect the default facial expressions.

1. Click the facial expression building block you need and then click OK to add it to the grid.
2. Click the Edit button to select one of the three Smoothing options and choose whether the smoothed or raw values are used:
   • Based on analysis settings — FaceReader uses the option chosen in the Analysis Settings. See Classification in the Settings chapter.
   • Always smoothed — FaceReader uses smoothed data.
   • Always raw — FaceReader uses the raw, unsmoothed data.

Derived Expressions

Valence and Arousal

Action Units

The 20 Action Units that are available in FaceReader, unilateral Action Units (left and right) and combined.

1. Click the Action Unit building block you need and then click OK to add it to the grid.
2. Click the Edit button to select one of the three Smoothing options and choose if the smoothed or raw values are used. See Facial Expressions.
3. Set the Intensity threshold. If the intensity of the Action Unit is lower than this threshold, the Action Unit will not be taken into account. The output of the building block will be zero.

   Default value: 0.1 which is equal to the Not Active threshold (see Action Unit Intensity).

Head Orientation

Orientation of the head relative to the x, y and z-axis (Pitch, Yaw and Roll).

Head Position

Horizontal position, Vertical position and Depth position relative to the camera.

Landmarks

Landmark X, Landmark Y, Landmark Z (respectively, the horizontal, vertical and depth translation of the landmark relative to the camera) and Landmarks Distance (the distance between two landmarks relative to the camera in millimeters).

1. Click one of the four building blocks and then click OK to add it to the grid.
2. Click the Edit button to set the Landmark index and in case of Landmarks Distance also the Dimensionality (either 2D or 3D).

Gaze Angles

Horizontal gaze angle, Vertical gaze angle.

Heart Rate

Heart Rate, Heart Rate Variability (RMSSD) and Heart Rate Variability (SDNN).

Tip: Click on one of the blocks to read the information that comes with it. Each block comes with a description and information on what values it can have as output. The Action Units also come with an example video in which the Action Unit is demonstrated.

Voice Expressions

Neutral from Voice, Happy from Voice, Sad from Voice and Angry from Voice.

Voice Secondary Expressions

Valence from Voice, Arousal from Voice, Loudness, Speech rate

Miscellaneous

Model quality — The model quality has a value between 0 and 1 and is represented by the Model quality bar in the analysis.

Source: FaceReader 10 Reference Manual (Help), Noldus Information Technology