Calculate Eyes Open Ratio

Introduction

The Eye Aspect Ratio (EAR) is an approximate estimation of the eye opening state. It is mainly used to detect the blinks of an eye using a ratio formula computed based on the eye width and height.

On a related note, the eyes open ratio (EOR) can be expressed as a formula derived from the EAR and denoted as a percentage value.

Main applications and examples of use

Various automated systems, designed for eye movement analysis, can now recognize if a person’s eyes are closed or blinking, or whether the eyes are closed or blinking in case the EAR drops below a certain threshold.

These systems are widely used for human supervision in complex environments that require a significant degree of attention and an adequate level of alertness. Some applications of this system are given below:

• The detection of drowsiness, based on eye patterns of the people being monitored, in order to prevent accidents.
• Monitoring babies to detect whether the baby’s eyes are open, and send an alert to the parent.
• The practices that are mainly employed by the police for deceit detection during their investigations in order to distinguish between honest and deceptive communication.