This paper describes a comparison of user experience of virtual reality (VR) image angles. 7 angles conditions are prepared and evaluated the user experience during viewing VR images with a headset by measuring subjective and objective indexes. Angle conditions were every 30 degrees from 180 to 360 degrees. From the results of the subjective indexes (reality, presence, and depth sensation), a 360-degree image was evaluated highest, and different evaluations were made between 240 and 270 degrees. In addition, from the results of the objective indexes (eye and head tracking), a tendency to spread the eye and head movement was found as the image angle increases.

This paper describes a comparison of user experience of virtual reality (VR) image format. The authors prepared the following four conditions and evaluated the user experience during viewing VR images with a headset by measuring subjective and objective indices
Condition 1: monoscopic 180-degree image, Condition 2: stereoscopic 180-degree image, Condition 3: monoscopic 360-degree image, Condition 4: stereoscopic 360-degree image. From the results of the subjective indices (reality, presence, and depth sensation), condition 4 was evaluated highest, and conditions 2 and 3 were evaluated to the same extent. In addition, from the results of the objective indices (eye and head tracking), a tendency to suppress head movement was found in 180-degree images.

The purpose of this research is to clarify the effects of binocular parallax in 360-degree images. Specifically, we measured and analyzed gazes during viewing stimuli for 60 seconds with different parallax distributions. The parallax distributions were four types of all 2D / all 3D / left and right 3D / front and back 3D. From the results, it was suggested that disparity distributions changed the viewing behavior with the passage of time, and even if parallax is added to a part of the image, the subjective stereoscopic effect increased. From these facts, it is suggested that there is effective 3D representation in the 360-degree images.

<p>The authors examined the effects of chair swiveling with the psycho-physiological effects of viewing short segments of 360° videos using a head-mounted display (HMD) in terms of the type of content. Twenty participants viewed 360° videos with varying features using an eye-tracking HMD consisting of a smartphone fitted in a case containing optics. Ten participants were seated on a swivel chair and the others on a fixed one. Objective indexes on gaze and body rotation and subjective indexes on simulator sickness, emotional reaction and immersion were measured. It was found that the features of content, especially camera motion, affect psychological effects like discomfort and observation behavior, and chair swiveling affects the behavior looking around, the reception of visual information and emotional response. It turns out that the rotating chair, which is easy to think that it supports the action the user sees, does not necessarily contribute to the user experience.</p>

<p>本研究ではスマートフォンを用いた簡易型ヘッドマウントディスプレイ（HMD）による立体視（3D）コンテンツの観察において，画面サイズの変化がユーザ体験に及ぼす影響とその補正方法について，実験的な検討を行った．具体的には，簡易型HMDを用いて3Dコンテンツの呈示サイズを変化させた際のユーザ体験として，立体感，自然さ，臨場感，見やすさ，視覚負担の5項目について7件法で回答を求めた．呈示サイズと水平方向のシフトによる補正の有無を要因とした検討の結果，呈示サイズがユーザ体験に影響し，補正によりその影響が軽減されることが確認された．</p>