Gaze detection apparatus, gaze detection method, and recording medium

A gaze detection method executed by a gaze detection apparatus, the method comprising:

• an interpupillary distance detection step of detecting an interpupillary distance between left and right eyes of a target person based on an image including the eyes of the target person;
• and
• a gaze detection step of detecting a gaze position of the target person based on obtained information including the interpupillary distance, wherein
• the gaze detection step comprises gaze change determination processing to determine that, if an eye movement is detected based on the obtained information, the eye movement involving a plurality of occurrences of change in the interpupillary distance within a predefined time period, the change in the interpupillary distance being equal to or greater than a predefined amount, a change has occurred in the gaze position of the target person, the change in the gaze position involving a change in viewing distance.

A non-transitory computer readable recording medium recording a program that causes a computer-controlled gaze detection apparatus to function as:

• an interpupillary distance detector that detects an interpupillary distance between left and right eyes of a target person based on an image including the eyes of the target person;
• and
• a gaze detector that detects a gaze position of the target person based on obtained information including the interpupillary distance, wherein
• the gaze detector comprises gaze change determination processing to determine that, if an eye movement is detected based on the obtained information, the eye movement involving a plurality of occurrences of change in the interpupillary distance within a predefined time period, the change in the interpupillary distance being equal to or greater than a predefined amount, a change has occurred in the gaze position of the target person, the change in the gaze position involving a change in viewing distance.