Eyeball detection device, eye-gaze tracking device, eyeball detection method, and medium

An eyeball detection method comprising:

• obtaining a face image that includes left and right eyeball images of target person;
• calculating a first-type distance representing distance between the target person and the imaging device;
• performing a search for the left and right eyeball images from the face image;
• and
• searching that, when one eyeball image of the left and right eyeball images of the target person is detected, includes searching for other eyeball image of the target person from the face image based on search result regarding the one eyeball image, based on the first-type distance, and based on a second-type distance representing distance between left and right eyeballs of the target person.

A non-transitory computer readable recording medium storing therein an eyeball detection program that causes a computer to execute:

• an operation of obtaining a face image that includes left and right eyeball images of target person;
• an operation of calculating a first-type distance representing distance between the target person and the imaging device;
• an operation of performing a search for the left and right eyeball images from the face image;
• and
• an operation of searching that, when one eyeball image of the left and right eyeball images of the target person is detected, includes searching for other eyeball image of the target person from the face image based on search result regarding the one eyeball image, based on the first-type distance, and based on a second-type distance representing distance between left and right eyeballs of the target person.