立體顯示器在近年來發展得十分迅速，相關產品不斷推陳出新，期望能提供人們更真實的視覺享受。儘管此一趨勢已成為市場潮流，但是，觀看立體顯示器所造成的不舒適感依然存在，使得立體顯示器始終未能普及。雖然在許多研究中都已探討到此議題，不過，目前仍沒有提出一個全面性的標準；因此，本研究之目的是透過人因評估方法建立完善的觀看立體影像標準，並找到觀看立體顯示器的最佳因子水準組合以提出建議。
實驗分為兩階段，同時以主觀與客觀人因評估方法探討觀看靜態與動態立體影像產生的不舒適感；第一階段為靜態立體影像實驗，透過田口實驗法同時研究五個因子對心智視覺疲勞度、主觀舒適度與客觀疲勞度的影響，包含：顯示器亮度、環境照度、平均像差、影像亮度對比與觀看時間；第二階段為動態立體影像實驗，以混合實驗法探討像差範圍、移動速度與影像亮度對比對心智視覺疲勞度、主觀舒適度與客觀疲勞度之效果。
研究結果顯示，環境照度和平均像差的交互作用對閃光融合閾值(CFF)和眼睛疲勞度有不小的影響，環境照度和觀看時間的交互作用對眼睛疲勞有顯著的影響、對眼睛微擾動調節的高頻變化量(HFC)和想嘔吐程度有不小的影響，而平均像差和觀看時間的交互作用對於HFC和眼睛疲勞程度有不小的影響；並且客觀上以高環境照度下觀看立體影像較佳，但在主觀上則是低環境照度較好。另外，根據靜態與動態實驗結果，建議觀看低影像亮度對比的立體影像會有較低的疲勞度。此外，我們也發現採用田口實驗法同時研究多項因子會得到較多的資訊，並且能針對不同需求提出完整觀看立體影像的最佳水準組合。

In recent years, the development of stereo displays progresses fast and related products are put out time to time to offer human a wholly new visual experience. Although stereo display has become a leader of markets, it still doesn't popularize because of the discomfort in viewing stereo displays. This subject has been discussed in many researches, but there are no integral standards proposed nowadays. Therefore, the purpose of this study was to establish a well standard on viewing stereoscopic images by ergonomics evaluations. It is expected to find out the best combination of independent variables so that the viewers may experience visual fatigue-free while watching stereo displays.
Two stages of experiments were conducted to evaluate the discomfort from viewing static and dynamic stereoscopic images by both subjective and objective assessment methods in this study. The first stage focused on static stereoscopic images. The effects of five factors, display luminance, ambient illumination, average of disparity, brightness contrast ratio, and viewing time, on psychophysical visual fatigue, subjective comfort, and objective fatigue were investigated simultaneously by Taguchi Methods. Then, the second stage experiment with the same assessment for range of disparity, velocity, and brightness contrast ratio of dynamic stereoscopic images was conducted by mixture design method.
The results showed that the interaction effect between ambient illumination and average of disparity was moderate on Critical Flicker Fusion (CFF) and on eye fatigue, between ambient illumination and viewing time was significant on eye fatigue and moderate on spectral power of high frequency component of accommodative microfluctuations (HFC) and nausea, and between average of disparity and viewing time was moderate on HFC and on eye fatigue. Moreover, viewing stereoscopic images under high ambient illumination was better in terms of objective fatigue, but under low ambient illumination was better in terms of subjective comfort. According to the results of static and dynamic experiments, images with low brightness contrast ratio were recommended. Furthermore, by Taguchi Methods, we got lots of information of variables, and the optimal combination for viewing stereo displays could be selected in the integrity based on different requirements.

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