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docs/website/versioned_docs/version-2.0/facial-landmark.md

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+---
+id: facial-landmark
+title: Facial Landmark
+---
+
+Facial landmarks refer to specific regions of the face, with x, y, and z coordinates for each facial landmark variable indicating where in the image frame that specific region of the face is located. 
+
+<figure>
+  <img src="/docs/assets/facial-landmark-1.png" width="500" alt="Visual representation of the facial landmarks calculated by OpenDBM, which relies on OpenFace and OpenCV for its measurements." />
+  <figcaption>Visual representation of the facial landmarks calculated by OpenDBM, which relies on OpenFace and OpenCV for its measurements.</figcaption>
+</figure>
+
+OpenDBM calculates overall change in facial landmark positioning and in doing so measures facial musculature movements at the level of individual facial landmarks. Individual movement of a total of 68 facial landmarks is measured using the raw and derived variables listed in the tables below.
+
+
+## Raw Variables
+
+| Variable      | Description |
+| ----------- | ----------- |
+| `fac_lmkXXdisp`      | **Landmark displacement.** Frame-wise change in landmark positioning i.e. the euclidean distance in the xyz plane, where XX can be any number between 01 and 68, referring to all individual facial landmarks.       |
+
+## Derived Variables
+
+| Variable      | Description |
+| ----------- | ----------- |
+| `fac_lmkXXdisp_mean`      | **Landmark displacement mean.** The mean value of fac_lmkXXdisp for the inputted video.       |
+| `fac_lmkXXdisp_std`      | **Landmark displacement standard deviation.** The standard deviation value of fac_lmkXXdisp for the inputted video.       |