Schepens Eye Research Institute, Massachusetts Eye and Ear, Boston, MA, USA.
Department of Ophthalmology, Harvard Medical School, Boston, MA, USA.
Transl Vis Sci Technol. 2020 Jul 7;9(8):6. doi: 10.1167/tvst.9.8.6. eCollection 2020 Jul.
Magnification is commonly used to reduce the impact of impaired central vision. However, magnification limits the field of view (FoV) which may make it difficult to follow the story. Most people with normal vision look in about the same place at about the same time, the center of interest (COI), when watching "Hollywood" movies. We hypothesized that if the FoV was centered at the COI, then this view would provide more useful information than either the original image center or an unrelated view location (the COI locations from a different video clip) as the FoV reduced.
The FoV was varied between 100% (original) and 3%. To measure video comprehension as the FoV reduced, subjects described 30-second video clips in response to two open-ended questions. A computational, natural-language approach was used to provide an information acquisition (IA) score.
The IA scores reduced as the FoV decreased. When the FoV was around the COI, subjects were better able to understand the content of the video clips (higher IA scores) as the FoV decreased than the other conditions. Thus, magnification around the COI may serve as a better video enhancement approach than simple magnification of the image center.
These results have implications for future image processing and scene viewing, which may help people with central vision loss view directed dynamic visual content ("Hollywood" movies).
Our results are promising for the use of magnification around the COI as a vision rehabilitation aid for people with central vision loss.
放大常用于减轻中心视力受损的影响。然而，放大限制了视野（FoV），这可能使得跟踪故事情节变得困难。大多数具有正常视力的人在观看“好莱坞”电影时，通常会同时看向大约相同的位置，即兴趣中心（COI）。我们假设，如果 FoV 集中在 COI 上，那么随着 FoV 的缩小，这种视角将比原始图像中心或不相关的视角位置（来自不同视频剪辑的 COI 位置）提供更多有用的信息。
FoV 在 100%（原始）和 3%之间变化。为了测量 FoV 缩小时的视频理解能力，受试者根据两个开放式问题描述 30 秒的视频剪辑。使用计算、自然语言的方法提供信息获取（IA）评分。
IA 评分随 FoV 的减小而降低。当 FoV 接近 COI 时，与其他条件相比，受试者能够更好地理解视频剪辑的内容（更高的 IA 评分），随着 FoV 的减小。因此，COI 周围的放大可能是一种比简单放大图像中心更好的视频增强方法。
这些结果对未来的图像处理和场景观看具有重要意义，这可能有助于中心视力丧失的人观看定向动态视觉内容（“好莱坞”电影）。
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