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Sampling requirements for lightfield displays with a large depth of field

机译:灯场的采样要求具有大景深的景深

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Lightfield displays potentially offer a new form of video content providing greater immersion and a stronger sense ofpresence. Invented by Gabriel Lippman in 19081, lightfield displays can present natural 3D images that have motionparallax in both horizontal and vertical directions. Importantly, they also allow the viewer to focus at different depthswithin the image, which is not possible with stereoscopic displays. Ideally they require a large depth of field. The depthof field is the range of depths, perpendicular to the display, over which the full resolution of the display (at zero depth) ismaintained. To make the best use of lightfield displays we need to know the depth of field and how image resolutiondecreases outside this range. Prior literature provides an indication of the depth of field for displays with shallow depthsof field. Such calculations are based on the Nyquist limit for multidimensional (angular and spatial) sampling.Extrapolating this approach for larger depths of field indicates that an infinite number of elemental pixels would berequired to achieve an infinite depth of field. If true this would be a disappointing result. However, such calculations arebased on the physical lightfield and do not take account of the observer. Taking account of the observer indicates thatonly a finite number of elemental pixels are required to achieve an infinite depth of field. This paper presents formulas,and their derivation, for the depth of field of lightfield displays with a large depth of field.
机译:LightField显示可能提供一种新的视频内容形式,提供更大的浸入和更强烈的感觉在场。由Gabriel Lippman于19081年发明,Lightfield显示器可以出现具有运动的自然3D图像在水平和垂直方向的视差。重要的是,他们还允许观众专注于不同的深度在图像内,这是不可能的立体显示器。理想情况下,他们需要大景深。深度字段是垂直于显示器的深度范围,其中显示器的全分辨率(零深度)是保持。为了充分利用Lightfield显示,我们需要了解场景以及图像分辨率的深度在此范围之外降低。现有文献提供了具有浅深度的景深的景深的指示领域。这种计算基于多维(角度和空间)采样的奈奎斯特限制。推断这种较大深度的方法表明无限数量的元素像素是需要实现无限景深。如果是这将是一个令人失望的结果。但是,这样的计算是基于物理灯场,不要考虑观察者。考虑到观察者表示只需要一个有限数量的元素像素来实现无限景深。本文呈现公式,及其衍生,对于灯场的景深,具有大景深。

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