In this study, for the heritage of industrial modernization we produced a stereoscopic archive of the JVC KENWOOD Yokohama Factory façade, which was dismantled in March 2011, by converting 2D into 3D images. Further, drawn images of the cultural asset were also converted into 3D images in order to evaluate them as part of a stereoscopic archive in terms of how well they express the asset. An experiment was conducted to compare subjects' content impressions under the different image conditions. For the experiment, head mounted display and 42-inch 3D TV were used. 30 students in twenties years of age. with normal binocular vision. participated through questionnaires and interviews to compare the impressions, between the conditions.
A common cause of asthenopia is viewing objects from a short distance, as is the case when working at a VDT (Visual Display Terminal). In general, recovery from asthenopia, especially accommodative asthenopia, is aided by looking into the distance. The authors have developed a stereoscopic 3-D display with dynamic optical correction that may reduce asthenopia. The display does this by reducing the discrepancy between accommodation and convergence, thereby presenting images as if they were actually in the distance. The results of visual acuity tests given before and after presenting stereoscopic 3-D images with this display show a tendency towards less asthenopia. In this study, the authors developed a refraction feedback function that makes the viewer's distance vision more effective when viewing stereoscopic 3-D images on the this display. Using this function, refraction is fed back during viewing and the viewer gradually acquires distance vision. The results of the study suggest that stereoscopic 3-D images are more effective than 2-D images for recovery from asthenopia.
This paper describes an examination of a stereoscopic 3-D display system using a correction lens. The purpose of the system is to reduce the accommodation and convergence difference during viewing stereoscopic 3-D images by using simple technique. This correction lens is a mono-focal lens, and added to the polarized filter glasses.
In this study, the authors carried out three experiments in order to examine the appropriate utilization conditions and effects of the correction lens. In experiment 1, the refractive power of correction lens was examined under six conditions in which distances of accommodation and convergence were theoretically equal. In experiment 2, the presenting condition of stereoscopic 3-D images suitable for the correction lens was examined by measurement of refractions during viewing visual target that moved in depth direction. In experiment 3, the effectiveness of the correction lens was examined by using the utilization conditions obtained in experiment 1 and 2.
From the results of the experiments, the following conclusions were drawn.
(1) Correction lenses shift the accommodation distance.
(2) Using a correction lens with the appropriate refractive power and setting the appropriate conditions for presenting stereoscopic 3-D images reduced the difference between accommodation and convergence.
(3) The use of a correction lens affected the subjective symptoms of asthenopia.