We investigated the effect of network delay on changing viewpoint in free-viewpoint video transmission by conducting a Quality of Experience (QoE) assessment. We address two transmission methods: synthesized image transmission and depth and image transmission. We assessed the image quality, interactivity of changing viewpoint, and comprehensive quality as QoE factors. The assessment results indicate that the image quality of the synthesized image transmission is higher than that of the depth and image transmission, which is advantageous in terms of interactivity. Also, because the inferior-to-superior relationship between the two methods depends on the characteristics of the video content and camera work used in the rendering process for the comprehensive quality, we should choose one suitable method from the two methods according to the situation.
