Crosstalk 對動態立體影像影響之人因評估

Abstract

隨著顯示器技術的提升以及對人因參數的了解，已使立體顯示器的產品化變為可行。現今影響立體影像的成像品質，主要原因是顯示器本身所引發的 Crosstalk 干擾，造成鬼影現象，降低影像品質，嚴重時，甚至無法呈現立體影像，然而目前立體顯示器在設計時，都僅依據靜態畫面下的 Crosstalk 因素作為考量，缺乏動態影像下Crosstalk 對影像品質影響的人因參數。 本論文利用Crosstalk 感知臨界值的縱深範圍，進行人因實驗的規劃，作為立體顯示器設計時，對立體影像品質判斷的主要依據。 實驗一.探討受測者的Panum’s fusional area 與Crosstalk 對3-D靜態畫面的影響，實驗結果顯示，隨Crosstalk level越大,其感知臨界值的縱深範圍越小。 實驗二.說明在動態畫面下Crosstalk 感知臨界值的縱深範圍較靜態畫面大。由運動的吉普車在不同縱深的運動範圍搭配五種Crosstalk level (0, 5, 10, 15, and 20%) 以及二種播放速度，進行實驗。結果顯示運動速度愈快，Crosstalk 感知臨界值的縱深範圍就越大。

A three-dimensional (3-D) display is becoming increasingly feasible based on various recent technological developments combined with an enhanced understanding of 3-D perception and human factors issues surrounding 3-D display. Nowadays, crosstalk is probably one of the most annoying distortions in 3-D displays. Perceptual ’benefits’ of perceived depth can be nullified by the perceptual ’costs’ of crosstalk, as both increases depth and crosstalk. However, display designers still have a relative lack of knowledge about the relevant subjective attributes affected by crosstalk in moving picture and how they are combined in an overall 3-D visual experience model. In the thesis, observers mark the depth according to threshold of perceiving crosstalk in a controlled experiment. The aim of the first experiment is to investigate two perceptually important attributes influencing the overall visual experience: Panum’s fusional area and perceived depth in still 3-D picture. Results show that perceiving depth decreases with increasing crosstalk. Especially higher crosstalk levels are more visible at larger large disparity. The first experiment shows that preference decreases with increasing crosstalk, but not as strong as expected. The second experiment shows that the crosstalk visibility threshold in moving objector is higher than in still one. The stimulus material used consisted of moving car varying in depth and crosstalk level (0, 5, 10, 15, and 20%) with two moving speed. Results show that the faster the object moves, the higher crosstalk visibility threshold increases.