Dwell Time Adaptive Three-Way Text Entry by Gaze

Most of the existing gaze-based text entry methods suffer from the Midas touch problem and low accuracy of the typing. To alleviate these problems, a dwell time adaptive three-way text entry method is proposed. In the proposed method, the adaptive dwell time is utilized to alleviate the Midas touch problem. Moreover, feedback and rest strategy for eye tracking help avoid the problem. Three-way decision is introduced to decide the character in text entry. In the virtual keyboard, the whole trigger area of a key is divided into core area, boundary area and negative area, which are correspondingly the positive region, the boundary region and negative region in three-way decision. The positive region is attached with a positive decision, which is the key. The boundary region is with a boundary decision, which is the key or the corresponding adjacent key. The negative region is with a reject decision, which is decided as an invalid typing. Finally, a typing software using the proposed method is programmed on SensoMotoric Instruments (SMI).