透明顯示器近年來備受重視。它可以運用在智慧窗、智慧櫥窗以及透明智慧眼鏡的擴增實境等新穎技術的應用。本研究主要是透過心理物理視覺實驗，提出在不同照明環境下，適用於透明液晶顯示器(T-LCD)和頭戴式透明液晶顯示器(HM-LCD)的影像階調處理模式。
本研究首先根據量測數據，推導這兩種透明顯示器在不同環境亮度下的色彩特性描述模式。研究結果顯示兩種顯示器的色彩特性截然不同。T-LCD在一般環境下很暗，背光區域的亮度必須高於環境，才能提高其影像對比。而HM-LCD為自發光成像設備，因此環境亮度必須降低才能獲得高影像對比。
為了優化其影像品質，本研究進行了五個心理物理視覺實驗。探討不同的照明環境亮度下T-LCD和HM-LCD影像顯示之最佳色調曲線。並找出能同時看清楚螢幕顯示資訊及背景物件的背景亮度比。以及視覺偏好的背景物件照明模式。
此外，光學透視式頭戴顯示器(OST-HMD)可應用於擴增實境與混合實境，也就是真實世界與虛擬世界融合為新的環境。然而，如何使虛擬物件在真實環境中看起來更真實，需要進一步研究。本研究最後一部分提出使OST-HMD的虛擬物件能夠較清晰呈現的影像處理模式。並在桌上型液晶螢幕模擬不同亮度比例的OST-HMD觀看環境，經由心理物理視覺實驗，獲得不同亮度環境下，適用於OST-HMD混合實境虛擬物件影像融合的調整參數。

Transparent displays gain much attention in recent years as they have the potential for new applications such as smart windows, showcases and augmented reality using smart glasses. In this study, the main focus is to propose image optimization models based on the results of psycho-visual experiments for a transparent LCD (T-LCD) and a see-through head-mounted LC display (HM-LCD) in different lighting environments.
The study introduces methods for characterizing the colors of both T-LCD and HM-LCD under various lighting conditions first. The color characteristics of the two types of devices are quite different. The T-LCD appears much darker than its surround. To enhance its image contrast, the luminance of backlight area must be stronger than that of its surround. The HM-LCD is a self-illuminated imaging device. The luminance of viewing environment therefore must be low enough to achieve high image contrast. To optimal their image quality, five psychophysical experiments were carried out to investigate preferred background luminance contrast and tone curves of a transparent LCD (T-LCD) and a see-through head-mounted LC display (HM-LCD) under different viewing conditions. The results showed that the preferred tone curves of two displays are quite different and the background luminance contrast plays a key role in determining its shape. To see background objects clearly, the optimal background luminance is different to that of blank background in HM-LCD viewing. Lighting geometry also has huge impact on seeing background objects through a T-LCD.
Optical see-through head-mounted display (OST-HMD) can be used for new applications such as augmented reality (AR) and mixed reality (MR). How to create realistic virtual objects, indistinguishable from real objects, is one of the most fundamental problems in such applications. In the last part of this study, a model for fusing virtual object into a read scene was proposed and optimized for the OST-HMD’s MR applications. Mixed test images were simulated on a desktop LCD and a psycho-visual experiment was conducted to obtain preferred parameters for two different luminance environments.

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