Detection and tracking of eyes for gaze-camera control

摘要

A head-off gaze-camera needs eye location information for head-free usage. For this purpose, we propose new algorithms to extract and track the positions of eyes in a real-time video stream. For extraction of eye positions, we detect blinks based on the differences between successive images. However, eyelid regions are fairly small. To distinguish them from dominant head movement, we elaborate a head movement cancellation process. For eye-position tracking, we use a template of ‘Between-the-Eyes,’ which is updated frame-by-frame, instead of the eyes themselves. Eyes are searched based on the current position of ‘Between-the-Eyes’ and their geometrical relations to the position in the previous frame. The ‘Between-the-Eyes’ pattern is easier to locate accurately than eye patterns. We implemented the system on a PC with a Pentium III 866-MHz CPU. The system runs at 30 frames/s and robustly detects and tracks the eyes.