We are pleased to introduce our groundbreaking software designed to advance facial symmetry analysis through the sophisticated numerical evaluation of Facial Palsy. Our program provides a multi-faceted analysis using both still images and videos, allowing users to assess and compare symmetry before and after surgeries or rehabilitation sessions.

For still images, the software employs the Distance Symmetry Score (DSS) and Angle Symmetry Score (ASS) for precise symmetry analysis. These metrics enable a detailed evaluation of facial symmetry. In the case of videos, our program expands on this by analyzing the Motion Symmetry Score (MSS), offering valuable insights into dynamic facial movements.

Distance Symmetry Score (DSS): The Distance Symmetry Score (DSS) evaluates the symmetry of a face by measuring the distance between a facial landmark and its mirrored counterpart. This is achieved by inverting the landmark on the left side of the face through the midsagittal plane.

Angle Symmetry Score (ASS): The Angle Symmetry Score (ASS) assesses angular symmetry by calculating the cosine similarity between the normal vector of the midsagittal plane and the vector connecting paired landmarks.

Motion Symmetry Score (MSS) analyzes three facial expressions: raised eyebrows, eye closure, and a big smile. It uses a set of landmarks in specific areas to analyze the values associated with each expression. The landmark areas referenced for each facial expression are illustrated in the figure.

Expression 1
Distance symmetry. The distance from the inverted landmark (pink) after inverting the landmark on the left side of the face through the midsagittal plane.
Expression 2
Amount of landmark movement determined through the distance of the landmarks corresponding to the left and right side of the face in the neutral and smile expression.
Expression 3
Landmark area referenced for each facial expression used in the assessment of facial paralysis

With this innovative software, healthcare professionals, researchers, and patients can gain a deeper understanding of facial symmetry, monitor progress over time, and make well-informed decisions about treatment and rehabilitation. Discover the capabilities of our facial symmetry analysis software today and explore new possibilities in Facial Palsy research and patient care.

Development Team

This software is the product of a multidisciplinary collaboration, combining the expertise of medical professionals and technical researchers to provide a solution for facial symmetry analysis.

Medical Professionals from Asan Medical Center, Seoul, Korea

Core Developers from Kwangwoon University, Seoul, Korea

Advisors from Kyung Hee University Medical Center, Seoul, Korea

Development Environment:

Licenses:

Our software is released under the GPL v3 (GNU General Public License, version 3) and the Apache License 2.0. Here are the corresponding statements:

  1. GPL v3 License: The software follows the GNU General Public License, version 3 (GPL v3). This license is a free software license that grants rights to copy, distribute, modify, and use the software. If you choose to use this software under the terms of the GPL v3, you must comply with the conditions stated in the license. The full text of the GPL v3 license can be found on the GNU website.
  2. Apache License 2.0: The software is licensed under the Apache License, version 2.0. This license is an open-source license that grants rights for both commercial and non-commercial use. If you choose to use this software under the terms of the Apache License 2.0, you must comply with the conditions stated in the license. The full text of the Apache License 2.0 can be found on the Apache Software Foundation (ASF) website.
    Therefore, the use, reproduction, distribution, and modification of this software should adhere to the provisions of both the GPL v3 and Apache License 2.0. This allows for the freedom to use and improve the software.