1. A method for detecting gaze locking, the method comprising: receiving an input image including a face; locating a pair of eyes in the face of the input image; generating a first coordinate frame based on one of the pair of eyes and generating a second coordinate frame based on another of the pair of eyes; concatenating the first coordinate frame and the second coordinate frame to produce a concatenated coordinate frame; identifying an eye region in the concatenated coordinate frame; generating, using a hardware processor, a feature vector by concatenating values of pixels in the eye region; and determining, based on the feature vector, whether the face is gaze locking.