Drowsiness sign notification device and method for notification of sign of drowsiness

A method for notification of a sign of drowsiness executed by a drowsiness sign notification device configured to notify detection of a sign of drowsiness to a driver of a vehicle, the method comprising:

• detecting an eye-closed state of the driver from each of face images representing a face region of the driver and generated at different times;
• determining whether a first eye closure ratio that is the ratio of the number of face images from which the eye-closed state is detected to the number of the face images generated in a first period exceeds a first threshold;
• determining whether a second eye closure ratio that is the ratio of the number of face images from which the eye-closed state is detected to the number of the face images generated in a second period longer than the first period exceeds a second threshold less than or equal to the first threshold after determination that the first eye closure ratio does not exceed the first threshold;
• and
• notifying detection of a sign of drowsiness to the driver via notification equipment provided in the vehicle, when it is determined that the first eye closure ratio exceeds the first threshold or that the second eye closure ratio exceeds the second threshold.

A non-transitory computer-readable medium storing a computer program for notification of a sign of drowsiness, the computer program causing a computer to execute a process comprising:

• detecting an eye-closed state of a driver of a vehicle from each of face images representing a face region of the driver and generated at different times;
• determining whether a first eye closure ratio that is the ratio of the number of face images from which the eye-closed state is detected to the number of the face images generated in a first period exceeds a first threshold;
• determining whether a second eye closure ratio that is the ratio of the number of face images from which the eye-closed state is detected to the number of the face images generated in a second period longer than the first period exceeds a second threshold less than or equal to the first threshold after determination that the first eye closure ratio does not exceed the first threshold;
• and
• notifying detection of a sign of drowsiness to the driver via notification equipment provided in the vehicle, when it is determined that the first eye closure ratio exceeds the first threshold or that the second eye closure ratio exceeds the second threshold.