立體電影3D不適症的誘發因素探討

Abstract

3D電影在近幾年開始受歡迎與流行，也導致一種新的症狀產生，稱做3D不適症或是阿凡達暈眩症。目前解釋的說法多偏重設備硬體的缺失，或是觀者生理層面的差異；卻較少討論到影像本身，是否是因為3D影像製作過程的問題，才誘發人類視覺與大腦的不適。本研究有二部分假設：一是誇大眼睛網膜像差或是忽略人眼肌肉運動時，可能會產生不適；二是傳統平面影像的攝影技巧與美學，完全移植到3D立體影像而不修正時，可能也會造成不適。研究在這假設底下規劃了六個實驗：（1）像差距離實驗；（2）聚合對焦實驗；（3）焦距與景深實驗；（4）亮度與景深實驗；（5）對焦物速度實驗；（6）畫面移動實驗。研究後的資料可供未來創作者，在製作3D立體影像時，從雙攝影機的配置到拍攝時的構圖美學技巧，都有減低或避免觀賞者不適的參考依據。

As technology advances, 3D movies enjoy a tremendous boost in recent years. With its popularity, a new symptom of 3Dache or Avatarh3dache emerges as well. Most studies addressing this issue place their emphasis on finding the solution at the display end. This study takes a new perspective by focusing on the production end for solving the problem. Two groups of possible causes are proposed and will be thoroughly examined. First, exaggerating the retinal disparity or ignoring the oculomotor cues may cause visual discomfort. These factors are related to the geometry of camera-setup. The second group pertain to visual effects of assorted kinds. Visual discomforts might be induced by applying traditional photographic techniques to 3D situations blindly. Six experiments are designed to evaluate the effects of these factors: (1) Inter-camera distance; (2) vergence angle of the camera; (3) Focal length and depth of field; (4) Lightness and depth of field; (5) Object motion; (6) Camera motion. This investigation can provide useful guidelines for 3D movie production.