In order to determine the limit and the range of the allowable binocular disparity to guarantee the safety of 3DTV watching, the visual discomfort level should be assessed while changing the level of binocular disparity with a standard stimulus. For this study, video content with five different levels of standard stimuli were designed. As shown in Table 16, a total of 45 visual stimuli were generated (15 stimuli for disparity and30 stimuli for depth motion).
Video clips with different disparity levels were created by controlling the disparity precisely in a production studio. Positive disparity was set to the maximum 4.5% (86 pixels) in the positive direction, negative disparity was set to the maximum 4.0% (72 pixels) in the negative direction, and the depth budget was set to the maximum 4.5% (86 pixels) by assigning the positive and negative portions equally. Two types of depth motion, when the motion appeared just once or repeatedly, were implemented. Additionally, the change of disparity was set to 2%, 4%, and 6% all starting from 0%, and they were presented in terms of 5-level stimuli depending on the depth motion of the object.