三維立體深度資訊於視覺誘發腦控顯示系統之研究

Abstract

隨著科技的進步，為了讓生活更加便利，高科技產品已是生活中不可缺少的元素。在以人為出發點的理念上，我們所需要的是更方便、更簡單直觀的操作方法與介面。因此，腦機介面(Brain Computer Interfaces, BCI)成為一門重要的課題。腦機介面是連接大腦與電腦的溝通介面，能夠將使用者的想法面直接轉換成操作指令進而控制外部裝置，是一相當具直覺性的操作介面。 本計畫選用的是穩態視覺誘發電位(Steady-State Visual Evoked Potential, SSVEP)作為媒介，但目前以視覺誘發電位做為媒介的研究，所選擇的大多是以2D、低閃爍頻率(<15Hz)的單色光作為輸入刺激源。這樣低頻率閃爍的刺激，會讓人感到不適、視覺疲勞，甚至可能引起偏頭痛、誘使癲癇的發作，所以為了改善這些情況，我們選擇中高頻率(30-45Hz)再加上將2D刺激源提升至3D刺激源，期望降低閃爍感並提高視覺誘發電位的效能。 本計畫最終目標是創造出以視覺誘發電位做為基礎之腦機介面的應用，為了達成此目標，先探討不同3D變因對視覺誘發電位的影響，主要分成三大項：1.研究3D影像立體深度資訊對SSVEP的影響。2. 3D顯示技術對SSVEP響應之優化。3. 3D顯示影像不適感之量化回饋。3D-SSVEP技術不僅可應用於3D顯示器上以達到活化顯示面板業界之功效，更提供了腦機介面的應用平台，未來將可共同研發出適用於臨床醫學及日常生活(消費性電子)的腦機介面應用。

With the advancement of technology, high-tech products have become essential to make our lives more convenient. On the needs of the human, an intuitive operation and a more user-friendly interface are must-haves. Therefore, the field of brain-computer interface (BCI) has become increasing popular over the last decade and has resulted in several different systems. BCI is a connection between a person's brain and a computer. Our intentions or operating instructions can be intuitively used to control external devices. We choose steady-state visual evoked potential (SSVEP) as the medium, that means visual stimuli are utilized in our research to evoke brain wave. However, researches on SSVEP are mostly based on 2D, low flicker frequency and monochromatic input visual stimulus. Low-frequency flicker stimulus will make people feel discomfort, visual fatigue, and may even cause a migraine and a seizure. In order to improve these defects, we choose a higher flicker frequency (30-45Hz) and turn the 2D stimulus into 3D stimulus, expecting to reduce the perception of light flashing and improve SSVEP performance. The ultimate target is to create biomedical and consumer electronic applications 3D-SSVEP-based BCI. In order to achieve this goal, the effect of different 3D variables on SSVEP will be explored. We divide our research topics into three parts: first, understanding the effects of 3D images’ three-dimensional depth information on SSVEP by EEG experiments; second, the effects of stereoscopic/autostereoscopic 3D displays and imaging integral on SSVEP; third, utilizing SSVEP to observe user’s discomfort from 3D image and giving feedback. 3D-SSVEP can not only activate 3D display industry but also provide the platform of BCI on 3D displays. In the future, combining human insights and clinical expertise, the integration and cooperation in this project can jointly develope BCI applications in medical research and daily life.